Between brackets is the number of accepted extant species
Click on "-" to collapse/hide all child taxa
Shows the number of accepted extant species within the taxon
The last expanded taxon is highlighted
Click on "+" to expand/show all child taxa
Click to see the taxon details page
- Compositae (33 071)
- Subfamily Asteroideae (Cass.) Lindl. (19 091)
- Tribe Ambrosieae Cass. accepted as Ambrosiinae Less.
- Tribe Anthemideae Cass. (1 976)
- Tribe Astereae Cass. (3 633)
- Tribe Athroismeae Panero (82)
- Tribe Bahieae B.G.Baldwin (86)
- Tribe Bellideae Cass. ex D.Don accepted as Astereae Cass.
- Tribe Bellieae DC. ex Godr. accepted as Bellidinae Willk.
- Tribe Bidentideae Godr. accepted as Coreopsideae Lindl.
- Tribe Calenduleae Cass. (121)
- Tribe Chaenactideae B.G.Baldwin (21)
- Tribe Chrysthellinae Ryding & K.Bremer accepted as Chrysanthellinae Ryding & K.Bremer
- Tribe Coreopsideae Lindl. (527)
- Tribe Cotuleae Lowe accepted as Anthemideae Cass.
- Tribe Doroniceae Panero (39)
- Tribe Eupatorieae Cass. (2 752)
- Tribe Feddeeae Pruski, Herrera, Anderb. & Franc.-Ort.
- Tribe Gnaphalieae Cass. ex Lecoq & Juill. (2 268)
- Tribe Helenieae Lindl. (138)
- Tribe Heliantheae Cass. (1 728)
- Tribe Inuleae Cass. (665)
- Tribe Iveae Rydb. accepted as Heliantheae Cass.
- Tribe Madieae Jeps. (228)
- Tribe Millerieae Lindl. (478)
- Tribe Neurolaeneae Rydb. (188)
- Tribe Perityleae B.G.Baldwin (78)
- Tribe Plucheeae Anderb. accepted as Inuleae Cass.
- Tribe Polymnieae (H.Rob.) Panero (8)
- Tribe Senecioneae Cass. (3 803)
- Subtribe Abrotanellinae H.Rob., G.D.Carr, R.M.King & A.M.Powell
- Subtribe Adenostylinae Benth. & Hook.f.
- Subtribe Crassocephalinae Y.R.Ling
- Subtribe Crocidiinae H.Rob. & Brettell
- Subtribe Doronicinae Y.R.Ling
- Subtribe Ligulariinae Y.R.Ling
- Subtribe Pseudojacobinae R.Mathur
- Subtribe Tephroseridinae C.Jeffrey & Y.L.Chen
- Subtribe Tussilagininae Dumort. (1)
- Genus Abrotanella (Gaudich.) Cass. (18)
- Genus Acleia DC. accepted as Senecio L.
- Genus Acrisione B.Nord. (1)
- Genus Adenostyles Cass. (8)
- Genus Adenostylium Rchb.f. accepted as Adenostyles Cass.
- Genus Adenotrichia Lindl. accepted as Senecio L.
- Genus Adonigeron Fourr. accepted as Jacobaea Mill.
- Genus Aequatorium B.Nord. (19)
- Genus Aetheolaena Cass. (1)
- Genus Alciope DC. accepted as Celmisia Cass.
- Genus Amblylepis Decne.
- Genus Anecio Neck. accepted as Senecio L.
- Genus Angeldiazia M.O.Dillon & Zapata (1)
- Genus Antillanthus B.Nord. (2)
- Genus Apalus DC. accepted as Blennosperma Less.
- Genus Arbelaezaster Cuatrec. (1)
- Genus Aristotela Adans. accepted as Othonna L.
- Genus Arnica Boehm. accepted as Doronicum L.
- Genus Arnoglossum Raf. (8)
- Genus Aronicum Neck. ex Rchb. accepted as Doronicum L.
- Genus Aronicum Neck. accepted as Doronicum L.
- Genus Arrhenechthites Mattf. (8)
- Genus Aspelina Cass. accepted as Senecio L.
- Genus Austrosynotis C.Jeffrey (1)
- Genus Baculellum L.V.Ozerova & A.C.Timonin accepted as Curio P.V.Heath
- Genus Bacurio Gideon F.Sm. & Figueiredo accepted as Curio P.V.Heath
- Genus Bafutia C.D.Adams (1)
- Genus Balbisia DC. accepted as Robinsonia DC.
- Genus Barkleyanthus H.Rob. & Brettell (1)
- Genus Bedfordia DC. (3)
- Genus Bethencourtia Choisy ex Link (3)
- Genus Blennosperma Less. (4)
- Genus Bolandia Cron (2)
- Genus Brachionostylum Mattf. (1)
- Genus Brachyglottis J.R.Forst. & G.Forst. (31)
- Genus Brachypappus Sch.Bip. accepted as Senecio L.
- Genus Brachyrhynchos Less. accepted as Senecio L.
- Genus Branicia Andrz. ex Trautv. accepted as Senecio L.
- Genus Cabreriella Cuatrec. (2)
- Genus Cacalia L. accepted as Adenostyles Cass. (8)
- Genus Cacaliopsis A.Gray (1)
- Genus Cadiscus E.Mey. ex DC. (1)
- Genus Calcalia Krock. accepted as Adenostyles Cass.
- Genus Calthoides B.Juss. ex DC. accepted as Othonna L.
- Genus Canariothamnus B.Nord. accepted as Bethencourtia Choisy ex Link
- Genus Capelio B.Nord. (4)
- Genus Caraea Hochst. ex Hochst. accepted as Euryops (Cass.) Cass.
- Genus Carderina (Cass.) Cass. accepted as Senecio L.
- Genus Caucasalia B.Nord. (4)
- Genus Caxamarca M.O.Dillon & Sagást. (1)
- Genus Centropappus Hook.f.
- Genus Ceradia Lindl. accepted as Othonna L.
- Genus Ceratella Hook.f. accepted as Abrotanella (Gaudich.) Cass.
- Genus Charadranaetes Janovec & H.Rob. (1)
- Genus Chersodoma Phil. (9)
- Genus Cineraria L. (45)
- Genus Cissampelopsis (DC.) Miq. (11)
- Genus Cladopogon Sch.Bip. ex Sch.Bip. accepted as Senecio L.
- Genus Coniothele DC. accepted as Blennosperma Less.
- Genus Conophora (DC.) Nieuwl. accepted as Arnoglossum Raf.
- Genus Crassocephalum Moench (25)
- Genus Crassothonna B.Nord. (13)
- Genus Cremanthodium Benth. (76)
- Genus Cremocephalum Cass. accepted as Crassocephalum Moench
- Genus Crocidium Hook. (2)
- Genus Crociseris (Rchb.) Fourr. accepted as Senecio L.
- Genus Culcitium Humb. & Bonpl. (6)
- Genus Curio P.C. Heath
- Genus Curio P.V.Heath (3)
- Genus Cyathocephalum Nakai accepted as Ligularia Cass.
- Genus Danaa Colla accepted as Senecio L.
- Genus Dauresia B.Nord. & Pelser (1)
- Genus Delairea Lem. (2)
- Genus Dendrocacalia (Nakai) Nakai ex Tuyama (3)
- Genus Dendrophorbium (Cuatrec.) C.Jeffrey (58)
- Genus Dendrosenecio (Hauman ex Hedberg) B.Nord. (7)
- Genus Dicercoclados C.Jeffrey & Y.L.Chen (1)
- Genus Digitacalia Pippen (5)
- Genus Dolichoglottis B.Nord. (2)
- Genus Dolichorrhiza (Pojark.) Galushko (4)
- Genus Doria Thunb. accepted as Othonna L.
- Genus Dorobaea Cass. (3)
- Genus Dresslerothamnus H.Rob. (2)
- Genus Ekmaniopappus Borhidi (1)
- Genus Elekmania B.Nord. (1)
- Genus Emilia Cass. (118)
- Genus Emiliella S.Moore (6)
- Genus Enantiotrichum E.Mey. ex DC. accepted as Euryops (Cass.) Cass.
- Genus Endocellion Turcz. ex Herder (1)
- Genus Epatitis Raf. accepted as Adenostyles Cass.
- Genus Erechtites Raf. (8)
- Genus Eriothrix Cass.
- Genus Eriotrix Cass. (2)
- Genus Erythrochaete Siebold & Zucc. accepted as Ligularia Cass.
- Genus Eudorus Cass. accepted as Senecio L.
- Genus Euryops (Cass.) Cass. (103)
- Genus Farfara Gilib. accepted as Tussilago L.
- Genus Farfugium Lindl. (2)
- Genus Farobaea Schrank ex Colla accepted as Senecio L.
- Genus Faujasia Cass. (5)
- Genus Faujasiopsis C.Jeffrey (2)
- Genus Fullartonia DC. accepted as Doronicum L.
- Genus Gamolepis sensu auct. plur. accepted as Euryops (Cass.) Cass.
- Genus Gamolepis Less. accepted as Steirodiscus Less.
- Genus Garcibarrigoa Cuatrec. (2)
- Genus Grammarthron Cass. accepted as Doronicum L.
- Genus Graphistylis B.Nord. (9)
- Genus Gymnodiscus Less. (2)
- Genus Gynaecura Hassk. accepted as Gynura Cass.
- Genus Gynoxys Cass. (124)
- Genus Gynura Cass. (49)
- Genus Haastia Hook.f. (5)
- Genus Haplosticha Phil.
- Genus Hasteola Raf. (2)
- Genus Herodotia Urb. & Ekman (1)
- Genus Herreranthus B.Nord.
- Genus Hertia Less. (9)
- Genus Hoehnephytum Cabrera (3)
- Genus Homogyne Cass. (2)
- Genus Hoppea Rchb.
- Genus Hubertia Bory (19)
- Genus Humbertacalia C.Jeffrey (6)
- Genus Ignurbia B.Nord.
- Genus Io B.Nord. (1)
- Genus Iocenes B.Nord. (1)
- Genus Iranecio B.Nord. (16)
- Genus Ischnea F.Muell. (5)
- Genus Jacmaia B.Nord. (1)
- Genus Jacobaea Mill. (44)
- Genus Jacobaeastrum Mannetti ex Kuntze
- Genus Jacobanthus Fourr.
- Genus Jaconecio P.V.Heath
- Genus Jacoraria P.V.Heath
- Genus Jessea H.Rob. & Cuatrec. (4)
- Genus Kleinia Mill. (57)
- Genus Koyamacalia H.Rob. & Brettell accepted as Parasenecio W.W.Sm. & Small (4)
- Genus Lachanodes DC.
- Genus Lamprocephalus B.Nord. (1)
- Genus Lasiocephalus Willd. ex Schltdl. accepted as Senecio L.
- Genus Lasiocephalus sensu auct. plur. accepted as Aetheolaena Cass.
- Genus Lasiocoma Bolus accepted as Euryops (Cass.) Cass.
- Genus Leonis B.Nord.
- Genus Lepidospartum (A.Gray) A.Gray (3)
- Genus Ligularia Cass. (146)
- Genus Ligulariopsis Y.L.Chen (1)
- Genus Lopholaena DC. (16)
- Genus Lordhowea B.Nord. (1)
- Genus Luina Benth. (2)
- Genus Lundinia B.Nord.
- Genus Lysichlamys Compton accepted as Euryops (Cass.) Cass.
- Genus Madaractis DC. accepted as Senecio L.
- Genus Margarita Gaudin
- Genus Mattfeldia Urb.
- Genus Melalema Hook.f.
- Genus Mesadenia Raf. accepted as Arnoglossum Raf.
- Genus Mesogramma DC. (1)
- Genus Mesoneuris A.Gray (1)
- Genus Microchaete Benth. accepted as Monticalia C.Jeffrey
- Genus Mikaniopsis Milne-Redh. (15)
- Genus Miricacalia Kitam. (1)
- Genus Misbrookea V.A.Funk (1)
- Genus Monticalia C.Jeffrey (4)
- Genus Nardosmia Cass. accepted as Petasites Mill.
- Genus Nelsonianthus H.Rob. & Brettell
- Genus Nemosenecio (Kitam.) B.Nord. (6)
- Genus Neoceis Cass. accepted as Erechtites Raf.
- Genus Nesampelos B.Nord.
- Genus Nordenstamia Lundin (14)
- Genus Notonia DC. accepted as Kleinia Mill. (3)
- Genus Notoniopsis B.Nord. accepted as Kleinia Mill.
- Genus Odontocline B.Nord. (5)
- Genus Odontotrichum Zucc. accepted as Psacalium Cass. (6)
- Genus Oldfeltia B.Nord. & Lundin
- Genus Oligothrix DC. (1)
- Genus Oresbia Cron & B.Nord. (1)
- Genus Oribasia ex DC.
- Genus Othonna L. (111)
- Genus Othonnopsis Jaub. & Spach accepted as Hertia Less. (1)
- Genus Packera Á.Löve & D.Löve (65)
- Genus Papuacalia Veldkamp (17)
- Genus Paracalia Cuatrec. (3)
- Genus Parafaujasia C.Jeffrey (1)
- Genus Paragynoxys (Cuatrec.) Cuatrec. (11)
- Genus Parasenecio W.W.Sm. & Small (73)
- Genus Pentacalia Cass. (213)
- Genus Pericalia Cass. accepted as Roldana La Llave
- Genus Pericallis D.Don (15)
- Genus Petasites Mill. (18)
- Genus Phaneroglossa B.Nord. (1)
- Genus Pippenalia McVaugh (1)
- Genus Pithosillum Cass. accepted as Emilia Cass.
- Genus Pittocaulon H.Rob. & Brettell (2)
- Genus Pladaroxylon (Endl.) Hook.f.
- Genus Pojarkovia Askerova (1)
- Genus Psacaliopsis H.Rob. & Brettell (3)
- Genus Psacalium Cass. (47)
- Genus Psednotrichia Hiern (2)
- Genus Pseudactis S.Moore accepted as Emilia Cass.
- Genus Pseudocadiscus Lisowski accepted as Stenops B.Nord.
- Genus Pseudogynoxys (Greenm.) Cabrera (14)
- Genus Pseudojacobaea (Hook.f.) R.Mathur (1)
- Genus Psilothonna (E.Mey. ex DC.) E.Mey. ex E.Phillips accepted as Steirodiscus Less.
- Genus Rainiera Greene
- Genus Rhetinodendron Meisn. accepted as Robinsonia DC. (1)
- Genus Robinsonecio T.M.Barkley & J.P. Janovec
- Genus Robinsonecio T.M.Barkley & Janovec (2)
- Genus Robinsonia DC. (7)
- Genus Roldana La Llave (55)
- Genus Ruckeria DC. accepted as Euryops (Cass.) Cass.
- Genus Rugelia Shuttlew. ex Chapm. (1)
- Genus Scrobicaria Cass. (3)
- Genus Senecillis Gaertn. accepted as Ligularia Cass. (3)
- Genus Senecio L. (1 649)
- Subgenus Senecio subg. Dendrosenecio Hauman ex Hedberg
- Subgenus Senecio subg. Dioicosenecio Cabrera accepted as Chersodoma Phil.
- Subgenus Senecio subg. Emilia (Cass.) O.Hoffm. accepted as Emilia Cass.
- Subgenus Senecio subg. Gynuropsis Muschl. accepted as Crassocephalum Moench
- Subgenus Senecio subg. Kleinia (Mill.) O.Hoffm. accepted as Kleinia Mill.
- Subgenus Senecio subg. Notonia (DC.) O.Hoffm. accepted as Kleinia Mill.
- Subgenus Senecio subg. Pseudogynoxys Greenm. accepted as Pseudogynoxys (Greenm.) Cabrera
- Subgenus Senecio subg. Synotis C.B.Clarke accepted as Cissampelopsis (DC.) Miq.
- Subgenus Senecio subg. Tephroseris (Rchb.) Korobkov
- Section Senecio sect. Aetheolaena (Cass.) O.Hoffm. accepted as Aetheolaena Cass.
- Section Senecio sect. Amplectentes Greenm.
- Section Senecio sect. Andina Cabrera
- Section Senecio sect. Arnicoidei (Schischk. ex C.Jeffrey & Y.L.Chen) Konechn. & Bar
- Section Senecio sect. Bahiana D.J.N.Hind
- Section Senecio sect. Bedfordia (DC.) Baill.
- Section Senecio sect. Bethencourtii DC. accepted as Bethencourtia Choisy ex Link
- Section Senecio sect. Caespitosi O.Hoffm.
- Section Senecio sect. Chenopodioides Cabrera
- Section Senecio sect. Columbaria Cabrera
- Section Senecio sect. Corymbosi Cabrera
- Section Senecio sect. Crassicephali Cabrera
- Section Senecio sect. Crociseris Rchb.
- Section Senecio sect. Culcitioides Cuatrec.
- Section Senecio sect. Culcitium (Humb. & Bonpl.) Cuatrec. accepted as Culcitium Humb. & Bonpl.
- Section Senecio sect. Cyclaminifolia Kitam.
- Section Senecio sect. Dendrophorbium Cuatrec. accepted as Dendrophorbium (Cuatrec.) C.Jeffrey
- Section Senecio sect. Diclini Cabrera accepted as Chersodoma Phil.
- Section Senecio sect. Emilioidei Muschl. accepted as Emilia Cass.
- Section Senecio sect. Erechtites (Raf.) Baill.
- Section Senecio sect. Flexicaulis C.Jeffrey & Y.L.Chen
- Section Senecio sect. Graveolentes Cabrera
- Section Senecio sect. Gynura (Cass.) Baill.
- Section Senecio sect. Haplosticha (Phil.) Cabrera
- Section Senecio sect. Hualtatini (Phil.) Cabrera
- Section Senecio sect. Jacobeae G.Don
- Section Senecio sect. Koreanogeni H.S.Pak
- Section Senecio sect. Leucanthemifolia Cabrera
- Section Senecio sect. Macbrideus Cuatrec. accepted as Dendrophorbium (Cuatrec.) C.Jeffrey
- Section Senecio sect. Mediterranei Gagnidze & Gagua
- Section Senecio sect. Metazanthus (Meyen) Cabrera
- Section Senecio sect. Mulgedifolia
- Section Senecio sect. Myriocephalus Cabrera accepted as Dendrophorbium (Cuatrec.) C.Jeffrey
- Section Senecio sect. Nemosenecio Kitam. accepted as Nemosenecio (Kitam.) B.Nord.
- Section Senecio sect. Oreophyton Cabrera
- Section Senecio sect. Otites Cabrera
- Section Senecio sect. Otopteri Cabrera
- Section Senecio sect. Palmatinervii Greenm. accepted as Roldana La Llave
- Section Senecio sect. Peltati (Muschl.) C.Jeffrey
- Section Senecio sect. Pinnati (H.Koyama) C.Jeffrey & Y.L.Chen
- Section Senecio sect. Pluricephali Cabrera accepted as Dendrophorbium (Cuatrec.) C.Jeffrey
- Section Senecio sect. Praegynoxys Cuatrec. accepted as Nordenstamia Lundin
- Section Senecio sect. Psacaliopsides (H.Rob. & Brettell) L.O.Williams
- Section Senecio sect. Pseudojacobaea Hook.f. accepted as Pseudojacobaea (Hook.f.) R.Mathur
- Section Senecio sect. Pseudosenecio Sond.
- Section Senecio sect. Reniformes (Boiss.) Menitsky & Konechn.
- Section Senecio sect. Rowleyani C.Jeffrey
- Section Senecio sect. Scandentes C.B.Clarke accepted as Cissampelopsis (DC.) Miq.
- Section Senecio sect. Scytophylli (Gagnidze) Gagnidze & Gagua
- Section Senecio sect. Streptothamni Greenm.
- Section Senecio sect. Streptothamnus Greenm. accepted as Pentacalia Cass.
- Section Senecio sect. Subincani Cabrera
- Section Senecio sect. Suffrutecius Cabrera
- Section Senecio sect. Suffruticosi Greenm.
- Section Senecio sect. Syllepis Griseb.
- Section Senecio sect. Synotis Benth. accepted as Cissampelopsis (DC.) Miq.
- Section Senecio sect. Triana Cuatrec.
- Section Senecio sect. Viscosi Baker
- Section Senecio sect. Websteria Cabrera
- Section Senecio sect. Wernerioides Cabrera
- Section Senecio sect. Xerophili Cabrera
- Section Senecio sect. Xerosenecio Cabrera
- Subsection Senecio subsect. Adenotrichi (Lindl.) Cabrera
- Subsection Senecio subsect. Albidiflori (Gagnidze) Gagnidze & Gagua
- Subsection Senecio subsect. Amplectentes Cabrera
- Subsection Senecio subsect. Brasilienses Cabrera
- Subsection Senecio subsect. Candidi Cabrera
- Subsection Senecio subsect. Cuneati Cabrera
- Subsection Senecio subsect. Filaginoidei Cabrera
- Subsection Senecio subsect. Glabrati Cabrera
- Subsection Senecio subsect. Indivisi G.Don
- Subsection Senecio subsect. Jacobaea Konechn.
- Subsection Senecio subsect. Megacephali Cabrera
- Subsection Senecio subsect. Pinnatisecti (Gagnidze) Gagnidze & Gagua
- Subsection Senecio subsect. Platyphylli (Gagnidze) Gagnidze & Gagua
- Subsection Senecio subsect. Radiati Cabrera
- Subsection Senecio subsect. Sandwithiani Cabrera
- Subsection Senecio subsect. Simplices Cabrera
- Subsection Senecio subsect. Subincani (Cabrera) Cabrera
- Subsection Senecio subsect. Viscosi (Baker) Cabrera
- Series Senecio ser. Abrotanifolii (Rouy) Konechn.
- Series Senecio ser. Albidiflori Gagnidze
- Series Senecio ser. Andina (Cabrera) Cabrera & S.E.Freire
- Series Senecio ser. Arborei (O.Hoffm.) C.Jeffrey
- Series Senecio ser. Arnicoidei Schischk. ex C.Jeffrey & Y.L.Chen
- Series Senecio ser. Asperifolii C.Jeffrey & Y.L.Chen
- Series Senecio ser. Barbaraeifolii Popescu
- Series Senecio ser. Carniolici (Schischk.) Konechn.
- Series Senecio ser. Cernui C.Jeffrey & Y.L.Chen
- Series Senecio ser. Cinerariae Konechn.
- Series Senecio ser. Cladobotrytes Gagnidze
- Series Senecio ser. Columbaria (Cabrera) Cabrera & S.E.Freire
- Series Senecio ser. Coriaceisquami C.Jeffrey & Y.L.Chen
- Series Senecio ser. Corymbosi (Cabrera) Cabrera
- Series Senecio ser. Coulmbaria (Cabrera) Cabrera & S.E.Freire
- Series Senecio ser. Crassicephali (Cabrera) Cabrera
- Series Senecio ser. Densiserrati C.Jeffrey & Y.L.Chen
- Series Senecio ser. Discoidei Benth.
- Series Senecio ser. Doria Konechn.
- Series Senecio ser. Extremiorientales (Schischk.) C.Jeffrey & Y.L.Chen
- Series Senecio ser. Fluviatiles Konechn.
- Series Senecio ser. Graveolentes (Cabrera) Cabrera
- Series Senecio ser. Haplostichia (Phil.) Cabrera & S.E.Freire
- Series Senecio ser. Hualtatini DC.
- Series Senecio ser. Jacobaea Konechn.
- Series Senecio ser. Lanati (Muschl.) C.Jeffrey
- Series Senecio ser. Leucanthemifolia (Cabrera) Cabrera & S.E.Freire
- Series Senecio ser. Lomincola H.Beltrán & A.Galán
- Series Senecio ser. Malacophylli C.Jeffrey & Y.L.Chen
- Series Senecio ser. Metazanthi (Meyen) Cabrera & S.E.Freire
- Series Senecio ser. Metazanthus (Meyen) Cabrera & S.E.Freire
- Series Senecio ser. Monticolae C.Jeffrey & Y.L.Chen
- Series Senecio ser. Myriocephali (Cabrera) Cabrera
- Series Senecio ser. Nemorenses Gagnidze
- Series Senecio ser. Otopteri (Cabrera) Cabrera
- Series Senecio ser. Paludosi Schischk. ex Konechn.
- Series Senecio ser. Pinnatisecti Gagnidze
- Series Senecio ser. Plantaginei (Harv.) C.Jeffrey
- Series Senecio ser. Platyphylli Gagnidze
- Series Senecio ser. Purpureolobati C.Jeffrey & Y.L.Chen
- Series Senecio ser. Racemosi Konechn.
- Series Senecio ser. Radiati Benth.
- Series Senecio ser. Scandentes (C.B.Clarke) H.Koyama accepted as Cissampelopsis (DC.) Miq.
- Series Senecio ser. Scytophylli Gagnidze
- Series Senecio ser. Sinuosi (Harv.) C.Jeffrey
- Series Senecio ser. Stenoglossi C.Jeffrey & Y.L.Chen
- Series Senecio ser. Subalpini Konechn.
- Series Senecio ser. Subdentati Schischk. ex Konechn.
- Series Senecio ser. Subscaposi C.Jeffrey & Y.L.Chen
- Series Senecio ser. Suffruticosi Cabrera
- Series Senecio ser. Sylvatici Schischk. ex Konechn.
- Series Senecio ser. Synotis H.Koyama accepted as Cissampelopsis (DC.) Miq.
- Series Senecio ser. Vernales Schischk. ex Konechn.
- Series Senecio ser. Viscosi Schischk. ex Konechn.
- Series Senecio ser. Vulgares Schischk. ex Konechn.
- Series Senecio ser. Websteria (Cabrera) Cabrera & S.E.Freire
- Series Senecio ser. Wernerioides (Cabrera) Cabrera
- Series Senecio ser. Xerosenecio (Cabrera) Cabrera & S.E.Freire
- Species Senecio ×embergeri
- Species Senecio ×pirottae Chiov.
- Species Senecio ×remotifolius Petrie accepted as Brachyglottis remotifolia (Petrie) B.Nord.
- Species Senecio ×spedenii Petrie accepted as Brachyglottis spedenii (Petrie) B.Nord.
- Species Senecio abadianus DC.
- Species Senecio abbreviatus S.Moore
- Species Senecio aberdaricus R.E.Fr. & T.C.E.Fr. accepted as Dendrosenecio battiscombei (R.E.Fr. & T.C.E.Fr.) E.B.Knox
- Species Senecio aberrans Greenm.
- Species Senecio abietinus Willd. ex Wedd. accepted as Pentacalia abietina (Willd. ex Wedd.) Cuatrec.
- Species Senecio abrotanifolius Gouan
- Species Senecio abrotanifolius Georgi
- Species Senecio abrotanifolius L. accepted as Jacobaea abrotanifolia (L.) Moench
- Species Senecio abrotanoides E.Mey. ex DC.
- Species Senecio abrotanoides E.Mey. accepted as Senecio pinnatifidus (P.J.Bergius) Less.
- Species Senecio abruptus Thunb.
- Species Senecio abyssinicus Sch.Bip. ex A.Rich. accepted as Emilia abyssinica var. abyssinica
- Species Senecio acanthifolius Hombr. & Jacq.
- Species Senecio acanthifolius Kostel.
- Species Senecio acanthifolius Hombr. & Jacquinot ex Decne.
- Species Senecio acarinus Cabrera
- Species Senecio acaulis (L.f.) Sch.Bip.
- Species Senecio acaulis Phil. accepted as Senecio breviscapus DC.
- Species Senecio accedens Greene accepted as Senecio bigelovii var. hallii A.Gray
- Species Senecio acerifolius Klatt
- Species Senecio acerifolius K.Koch accepted as Roldana angulifolia (DC.) H.Rob. & Brettell
- Species Senecio acerifolius Hemsl. accepted as Senecio glinophyllus (H.Rob. & Brettell) McVaugh
- Species Senecio acerifolius C.Winkl. accepted as Sinosenecio euosmus (Hand.-Mazz.) B.Nord.
- Species Senecio acervatus S.Moore accepted as Solanecio mannii (Hook.f.) C.Jeffrey
- Species Senecio acetosifolius Baker
- Species Senecio achalensis Cabrera
- Species Senecio achilleifolius DC.
- Species Senecio achyrotrichus Diels accepted as Ligularia achyrotricha (Diels) Ling
- Species Senecio aciculatus Cuatrec. accepted as Pentacalia abietina (Willd. ex Wedd.) Cuatrec.
- Species Senecio aclonetus Phil. accepted as Senecio linariifolius Poepp. ex DC.
- Species Senecio aclydiphyllus Cuatrec.
- Species Senecio aconitifolius (Bunge) Turcz. accepted as Syneilesis aconitifolia (Bunge) Maxim.
- Species Senecio acroleucus Merxm.
- Species Senecio acromaculatus Ling accepted as Senecio thianschanicus Regel & Schmalh.
- Species Senecio acromaculus Ling
- Species Senecio actinella Greene
- Species Senecio actinoleucus F.Muell.
- Species Senecio actinotus Hand.-Mazz.
- Species Senecio acuminatissimus Cabrera accepted as Dendrophorbium acuminatissimum (Cabrera) D.J.N.Hind
- Species Senecio acuminatus Wall.
- Species Senecio acuminatus Wall. ex DC. accepted as Synotis acuminata (Wall. ex DC.) C.Jeffrey & Y.L.Chen
- Species Senecio acutangulus (Bertol.) Hemsl.
- Species Senecio acutidens Rydb. accepted as Packera tridenticulata (Rydb.) W.A.Weber & Á.Löve
- Species Senecio acutidentatus A.Rich. accepted as Crassocephalum ×picridifolium (DC.) S.Moore
- Species Senecio acutifolius DC.
- Species Senecio acutipinnus Hand.-Mazz.
- Species Senecio adamantinus Bong.
- Species Senecio adamantinus Bang.
- Species Senecio adamsii Cheeseman accepted as Brachyglottis adamsii (Cheeseman) B.Nord.
- Species Senecio adamsii Howell accepted as Packera streptanthifolia (Greene) W.A.Weber & Á.Löve
- Species Senecio addoensis Compton accepted as Senecio scaposus var. addoensis (Compton) G.D.Rowley
- Species Senecio adenocalyx Dinter accepted as Senecio radicans (L.f.) Sch.Bip.
- Species Senecio adenodontus DC.
- Species Senecio adenolepis Greenm. accepted as Roldana chapalensis (S.Watson) H.Rob. & Brettell
- Species Senecio adenophylloides Sch.Bip. accepted as Senecio rufescens DC.
- Species Senecio adenophylloides Sch.Bip. ex Wedd. accepted as Senecio rufescens DC.
- Species Senecio adenophyllus Meyen & Walp.
- Species Senecio adenophyllus Walp.
- Species Senecio adenostylifolius Humbert
- Species Senecio adenostyloides Franch. & Sav.
- Species Senecio adenostyloides Franch. & Sav. ex Maxim. accepted as Parasenecio adenostyloides (Franch. & Sav. ex Maxim.) H.Koyama
- Species Senecio adenotrichia G.Nicholson
- Species Senecio adenotrichius DC.
- Species Senecio adfinis Less. ex Harv. & Sond.
- Species Senecio adglacialis Cuatrec.
- Species Senecio admirabilis Greene accepted as Senecio serra var. admirabilis (Greene) A.Nelson
- Species Senecio adnatus DC.
- Species Senecio adnivalis Stapf accepted as Dendrosenecio adnivalis var. adnivalis
- Species Senecio adolfi-friderici Muschl.
- Species Senecio adolfi-friedericii Muschl. accepted as Solanecio nandensis (S.Moore) C.Jeffrey
- Species Senecio adonidifolius Loisel. accepted as Jacobaea adonidifolia (Loisel.) Pelser & Veldkamp
- Species Senecio adrianicus Cabrera
- Species Senecio adscendens Bojer ex DC. accepted as Senecio andinus H.Buek
- Species Senecio adustus S.Moore accepted as Senecio pachyrhizus O.Hoffm.
- Species Senecio aegadensis C.Brullo & Brullo
- Species Senecio aegyptius L.
- Species Senecio aequinoctialis R.E.Fr.
- Species Senecio aetfatensis B.Nord.
- Species Senecio aethnensis Jan ex DC. accepted as Senecio squalidus subsp. aethnensis (DC.) Greuter
- Species Senecio affinis DC.
- Species Senecio affinis Greenm.
- Species Senecio africanus Hort. ex Poir.
- Species Senecio afromontanus (R.E.Fr.) Humbert & Staner accepted as Crassocephalum montuosum (S.Moore) Milne-Redh.
- Species Senecio agapatensis Sch.Bip. accepted as Senecio ayapatensis Sch.Bip. ex Wedd.
- Species Senecio agapetes C.Jeffrey
- Species Senecio agathionanthes Muschl. accepted as Gynura scandens O.Hoffm.
- Species Senecio agnostus Klatt
- Species Senecio ahrendsi Phil. accepted as Senecio glaber Less.
- Species Senecio ahrendsii Phil.
- Species Senecio ainsliaeiflorus Franch.
- Species Senecio ainsliiflorus Franch. accepted as Parasenecio ainsliiflorus (Franch.) Y.L.Chen
- Species Senecio aitonianus G.Don
- Species Senecio aizoides (DC.) Sch.Bip. accepted as Kleinia aizoides DC.
- Species Senecio akrabatensis Franch.
- Species Senecio aksuensis Pavlov
- Species Senecio alabamensis Britton ex Small accepted as Packera tomentosa (Michx.) C.Jeffrey
- Species Senecio alabugensis C.Winkl.
- Species Senecio alaskanus Hultén accepted as Tephroseris yukonensis (A.E.Porsild) Holub
- Species Senecio alatipes Greenm.
- Species Senecio alatopetiolatus J.Calvo, E.Freire & Sklenář
- Species Senecio alatus Willd. ex Ledeb.
- Species Senecio alatus Sessé & Moc.
- Species Senecio alatus Wall. accepted as Synotis alata (Wall. ex DC.) C.Jeffrey & Y.L.Chen
- Species Senecio alatus Wall. ex DC. accepted as Synotis alata (Wall. ex DC.) C.Jeffrey & Y.L.Chen
- Species Senecio albanensis DC.
- Species Senecio albaniae H.Beltrán
- Species Senecio albanopsis Hilliard
- Species Senecio albens Sch.Bip. accepted as Senecio pensilis Greenm.
- Species Senecio alberti-smithii Cuatrec.
- Species Senecio albescens Burb. & Colgan
- Species Senecio albescens De Wild. accepted as Dendrosenecio adnivalis subsp. friesiorum (Mildbr.) E.B.Knox
- Species Senecio albicans Pers.
- Species Senecio albicaulis Hook. & Arn.
- Species Senecio albicaulis Sch.Bip.
- Species Senecio albidus E.Mey. ex DC.
- Species Senecio albiflorus Sch.Bip. accepted as Erechtites albiflorus (Sch.Bip.) Hassemer & Funez
- Species Senecio albiflorus Phil. accepted as Senecio filaginoides DC.
- Species Senecio albifolius DC.
- Species Senecio albirameus Cuatrec.
- Species Senecio albodentatus Vuk.
- Species Senecio alboffianus Macloskie
- Species Senecio albogilvus I.Thomps.
- Species Senecio albolanatus Phil.
- Species Senecio albolutescens Sch.Bip.
- Species Senecio albonervius Greenm.
- Species Senecio albo-punctatus Bolus
- Species Senecio albopurpureus Kitam.
- Species Senecio alboranicus Maire accepted as Senecio gallicus Vill.
- Species Senecio albotectus Cuatrec. accepted as Pentacalia albotecta (Cuatrec.) Cuatrec.
- Species Senecio albus J.N.Nakaj. & A.M.Teles
- Species Senecio alcicornis Hook. & Arn.
- Species Senecio alcidiphyllus Cuatrec. accepted as Pentacalia aclydiphylla (Cuatrec.) Cuatrec.
- Species Senecio alciope Sch.Bip.
- Species Senecio alfalfalis Phil. accepted as Senecio microphyllus Phil.
- Species Senecio algens Wedd.
- Species Senecio alienus B.L.Rob. & Seaton
- Species Senecio allapajanus Cuatrec.
- Species Senecio alleizettei (Humbert) Humbert
- Species Senecio alliariifolius O.Hoffm.
- Species Senecio alliariifolius Bornm.
- Species Senecio alloeophyllus O.Hoffm.
- Species Senecio alloeophyllus O.Hoffm. ex Dusén
- Species Senecio almagroi Cuatrec. accepted as Pseudogynoxys engleri (Hieron.) H.Rob. & Cuatrec.
- Species Senecio almasensis Mattf.
- Species Senecio almeidae Phil.
- Species Senecio almironcillo M.Gómez accepted as Antillanthus almironcillo (M.Gómez) B.Nord.
- Species Senecio almorzaderonis Cuatrec.
- Species Senecio alniphilus Cabrera
- Species Senecio aloides DC.
- Species Senecio alpester Kern.
- Species Senecio alpestris Gaudin accepted as Senecio ovatus subsp. alpestris (Gaudin) Herborg
- Species Senecio alpestris DC. accepted as Tephroseris longifolia (Jacq.) Griseb. & Schenk
- Species Senecio alpicola Rydb. accepted as Packera werneriifolia (A.Gray) W.A.Weber & Á.Löve
- Species Senecio alpinus (L.) L.f. accepted as Jacobaea alpina (L.) Moench
- Species Senecio alpinus C.B.Clarke accepted as Senecio albopurpureus Kitam.
- Species Senecio alpinus (L.) Scop. accepted as Jacobaea alpina (L.) Moench
- Species Senecio alpivagus Gand.
- Species Senecio alsophilus Phil.
- Species Senecio altaicus (DC.) Sch.Bip. accepted as Ligularia altaica DC.
- Species Senecio alternifolius (Sch.Bip. ex Rusby) Greenm. accepted as Nordenstamia repanda (Wedd.) Lundin
- Species Senecio alticola T.C.E.Fr. accepted as Dendrosenecio erici-rosenii subsp. alticola (Mildbr.) E.B.Knox
- Species Senecio altimontanus A.M.Teles & L.D.Meireles
- Species Senecio altissimus Mill.
- Species Senecio altoandinus Cabrera
- Species Senecio altus Rydb. accepted as Senecio sphaerocephalus Greene
- Species Senecio alvarezensis Greenm.
- Species Senecio amabilis Vell. accepted as Senecio brasiliensis (Spreng.) Less.
- Species Senecio amabilis DC. accepted as Senecio anapetes C.Jeffrey
- Species Senecio amadorensis Greenm.
- Species Senecio amaniensis (Engl.) H.Jacobsen accepted as Kleinia amaniensis (Engl.) A.Berger
- Species Senecio ambatensis Cabrera
- Species Senecio ambavilla Pers.
- Species Senecio ambifarius S.Moore
- Species Senecio ambiguus (Biv.) DC. accepted as Jacobaea ambigua (Biv.) Pelser & Veldkamp
- Species Senecio amblyphyllus Cotton, Cotton & Blakelock
- Species Senecio amblyphyllus Cotton accepted as Dendrosenecio elgonensis subsp. elgonensis
- Species Senecio ambondrombeensis Humbert accepted as Io ambondrombeensis (Humbert) B.Nord.
- Species Senecio ambositrensis Humbert
- Species Senecio ambraceus Turcz. ex DC.
- Species Senecio ambrosioides Mart. ex Baker
- Species Senecio ambrosioides Mart. accepted as Senecio brasiliensis (Spreng.) Less.
- Species Senecio ambrosioides Rydb. accepted as Senecio eremophilus var. kingii (Rydb.) Greenm.
- Species Senecio ameghinoi Speg.
- Species Senecio americanus (L.f.) DC. accepted as Pentacalia americana (L.f.) Cuatrec.
- Species Senecio ammophilus Greene accepted as Senecio californicus DC.
- Species Senecio ammophilus Phil. accepted as Senecio philippii Sch.Bip. ex Wedd.
- Species Senecio amoenicolor Gand.
- Species Senecio amoenus Sch.Bip. ex A.Rich.
- Species Senecio amoenus Sch.Bip. accepted as Senecio nanus Sch.Bip. ex A.Rich.
- Species Senecio amphibolus K.Koch accepted as Senecio kolenatianus C.A.Mey.
- Species Senecio amphibolus Wedd. accepted as Senecio dryophyllus Meyen & Walp.
- Species Senecio amphilobus Wedd. accepted as Senecio dryophyllus Meyen & Walp.
- Species Senecio amplectens A.Gray
- Species Senecio amplexicaulis Wall.
- Species Senecio amplexicaulis Kunth accepted as Pentacalia amplexicaulis (Kunth) Cuatrec.
- Species Senecio amplexicaulis (DC.) Wall. ex C.B.Clarke accepted as Ligularia amplexicaulis DC.
- Species Senecio amplexifolius Humbert accepted as Humbertacalia amplexifolia (Humbert) C.Jeffrey
- Species Senecio amplificatus C.Jeffrey
- Species Senecio ampliflorus
- Species Senecio ampliflorus G.D.Rowley
- Species Senecio amplifolius Sch.Bip.
- Species Senecio amplifolius (DC.) Hemsl. accepted as Psacalium amplifolium (DC.) H.Rob. & Brettell
- Species Senecio amplus J.Rémy
- Species Senecio ampullaceus Hook.
- Species Senecio amurensis Schischk. accepted as Tephroseris kirilowii (Turcz. ex DC.) Holub
- Species Senecio amygdalifolius F.Muell.
- Species Senecio anacampserotis DC. accepted as Senecio spathulatus var. attenuatus I.Thomps.
- Species Senecio anacephalus Griseb. accepted as Senecio candollii Wedd.
- Species Senecio anacletus Greene accepted as Senecio wootonii Greene
- Species Senecio analogus DC.
- Species Senecio anampoza Baker accepted as Cineraria anampoza (Baker) Baker
- Species Senecio anapetes C.Jeffrey
- Species Senecio ancashinus Cabrera
- Species Senecio anconquijae Cabrera
- Species Senecio andapensis Humbert
- Species Senecio andersonii Hook.f.
- Species Senecio andersonii C.B.Clarke
- Species Senecio andersonii Clokey accepted as Senecio spartioides Torr. & A.Gray
- Species Senecio andicola Turcz. accepted as Pentacalia andicola (Turcz.) Cuatrec.
- Species Senecio andicola Phil. accepted as Senecio oreinus Cabrera
- Species Senecio andinus H.Buek
- Species Senecio andinus Nutt. accepted as Senecio serra var. serra Hook.
- Species Senecio andohahelensis Humbert
- Species Senecio andrei Cuatrec.
- Species Senecio andrei Greenm. accepted as Pentacalia andrei (Greenm.) Cuatrec.
- Species Senecio andrieuxii DC.
- Species Senecio andringitrensis Humbert accepted as Hubertia andringitrensis (Humbert) C.Jeffrey
- Species Senecio andryaloides DC.
- Species Senecio andrzejowskyi Tzvelev accepted as Jacobaea andrzejowskyi (Tzvelev) B.Nord. & Greuter
- Species Senecio anethifolius A.Cunn. ex DC.
- Species Senecio anethifolius A.Cunn.
- Species Senecio angavonensis Bojer ex DC. accepted as Senecio emirnensis subsp. angavonensis (Bojer ex DC.) Humbert
- Species Senecio angelensis Domke accepted as Dendrophorbium angelense (Domke) B.Nord.
- Species Senecio angosturae Cuatrec.
- Species Senecio angulatus L.f.
- Species Senecio angulatus Vahl
- Species Senecio angulifolius DC.
- Species Senecio angulosus Wall.
- Species Senecio angustatus Simonk.
- Species Senecio angustatus (Kirk) Cockayne & Sledge accepted as Brachyglottis bellidioides var. angustata (Kirk) B.Nord.
- Species Senecio angustifolius (Thunb.) Willd.
- Species Senecio angustifolius G.Forst.
- Species Senecio angustifolius Sond.
- Species Senecio angustifolius Wall. ex DC.
- Species Senecio angustifolius Hayata accepted as Senecio morrisonensis var. dentatus Kitam.
- Species Senecio angustilobatus Muschl. ex Joeger
- Species Senecio angustilobus F.Muell. accepted as Senecio anethifolius subsp. anethifolius
- Species Senecio angustiradiatus T.M.Barkley
- Species Senecio angustiradiatus F.A.Barkley
- Species Senecio angustissimus Phil.
- Species Senecio anisodus Klatt
- Species Senecio anisophyllus Klatt accepted as Roldana jurgensenii (Hemsl.) H.Rob. & Brettell
- Species Senecio anomalochrous Hilliard
- Species Senecio anomalus DC.
- Species Senecio anonymus Wood
- Species Senecio anonymus Alph.Wood accepted as Packera anonyma W.A.Weber & Á.Löve
- Species Senecio ansteadi Tadul. & Jacob accepted as Cissampelopsis ansteadii (Tadul. & Jacob) C.Jeffrey & Y.L.Chen
- Species Senecio antaicochensis Cuatrec. accepted as Senecio hohenackeri Sch.Bip. ex Sch.Bip.
- Species Senecio antaisaka Humbert
- Species Senecio antambolorum Humbert
- Species Senecio antandroi Scott-Elliot
- Species Senecio antennaria Wedd. accepted as Chersodoma antennaria (Wedd.) Cabrera
- Species Senecio antennariifolius Britton accepted as Packera antennariifolia (Britton) W.A.Weber & Á.Löve
- Species Senecio anteuphorbium (L.) Sch.Bip. accepted as Kleinia anteuphorbium (L.) Haw.
- Species Senecio anthemidiphyllus J.Rémy
- Species Senecio anthemifolius Harv.
- Species Senecio anthemifolius Sieber ex Steud.
- Species Senecio anthemoides Steud.
- Species Senecio anthorifolius Presl ex Rchb.
- Species Senecio antioquensis Cuatrec. accepted as Pentacalia antioquensis (Cuatrec.) Cuatrec.
- Species Senecio antipodus Kirk accepted as Senecio radiolatus subsp. antipodus (Kirk) C.J.Webb
- Species Senecio antirhinifolius Phil. accepted as Senecio subumbellatus Phil.
- Species Senecio antisanae Benth. accepted as Senecio senecioides (Kunth) Kuntze
- Species Senecio antitensis Baker
- Species Senecio antofagastanus Cabrera
- Species Senecio antucensis Phil.
- Species Senecio antunesii O.Hoffm.
- Species Senecio apargiaefolius
- Species Senecio apargiifolius Walp.
- Species Senecio apenninus Tausch accepted as Senecio provincialis (L.) Druce
- Species Senecio apensis Cabrera
- Species Senecio aphanactis Greene
- Species Senecio apiculatus Sch.Bip. ex Wedd. accepted as Pentacalia apiculata (Sch.Bip. ex Wedd.) Cuatrec.
- Species Senecio apiifolius Passarge
- Species Senecio apiifolius Benth. & Hook.f. ex Mendonça
- Species Senecio apiifolius (DC.) Benth. & Hook.f. ex O.Hoffm. accepted as Mesogramma apiifolium DC.
- Species Senecio apocynifolius (Baker) Humbert
- Species Senecio apolobambensis Cabrera
- Species Senecio appendiculatus L.f.
- Species Senecio appendiculatus (Lam.) DC.
- Species Senecio appendiculatus Greenm. accepted as Packera neomexicana var. neomexicana (A.Gray) W.A.Weber & Á.Löve
- Species Senecio appendiculatus Poir. accepted as Senecio lyratus Forssk.
- Species Senecio appendiculatus (Lam.) Less. ex Decne accepted as Senecio lamarckianus Bullock
- Species Senecio appendiculatus (L.f.) Sch.Bip. accepted as Pericallis appendiculata (L.f.) B.Nord.
- Species Senecio apricus Klatt accepted as Senecio erechtitioides Baker
- Species Senecio apricus Phil. accepted as Senecio farinifer Hook. & Arn.
- Species Senecio apuanus Tausch accepted as Senecio nemorensis subsp. apuanus (Tausch) Greuter
- Species Senecio apulus Ten. ex Nyman
- Species Senecio apulus Ten. accepted as Senecio leucanthemifolius Poir.
- Species Senecio aquaniger Cabrera & Zardini accepted as Senecio pogonias Cabrera
- Species Senecio aquariensis Greenm.
- Species Senecio aquaticus Boiss.
- Species Senecio aquaticus Loisel.
- Species Senecio aquaticus Hill accepted as Jacobaea aquatica (Hill) G.Gaertn., B.Mey. & Scherb.
- Species Senecio aquifoliaceus DC.
- Species Senecio aquilaris Cabrera
- Species Senecio aquilonaris Schischk.
- Species Senecio arabicus L. accepted as Senecio aegyptius var. discoideus Boiss.
- Species Senecio arabidifolius O.Hoffm.
- Species Senecio arachnanthus Franch.
- Species Senecio arachnoideus Rydb.
- Species Senecio arachnoideus (C.B.Clarke) M.R.Almeida
- Species Senecio arachnoideus Wall.
- Species Senecio arachnoideus Sieber ex DC. accepted as Senecio scopolii Hoppe & Hornsch.
- Species Senecio arachnoideus Phil. accepted as Senecio donianus Hook. & Arn.
- Species Senecio arachnolomus Wedd.
- Species Senecio araeus Phil.
- Species Senecio araneosus E.Mey. ex DC. accepted as Senecio walkeri Arn.
- Species Senecio araneosus Koyama accepted as Cissampelopsis corifolia C.Jeffrey & Y.L.Chen
- Species Senecio araucanus Phil.
- Species Senecio arboluco Cuatrec.
- Species Senecio arborescens Steetz
- Species Senecio arboreus (Kunth) Greenm. accepted as Pentacalia arborea (Kunth) H.Rob. & Cuatrec.
- Species Senecio arborluco Cuatrec.
- Species Senecio arbutifolius Kunth accepted as Pentacalia arbutifolia (Kunth) Cuatrec.
- Species Senecio archeri (Compton) H.Jacobsen accepted as Senecio toxotis C.Jeffrey
- Species Senecio archeri Cuatrec. accepted as Pentacalia archeri (Cuatrec.) Cuatrec.
- Species Senecio arcticus Rupr. accepted as Tephroseris palustris (L.) Rchb.
- Species Senecio arctiifolius Baker
- Species Senecio arctisibiricus Jurtzev & Korobkov
- Species Senecio arechavaletae Baker
- Species Senecio arenarius Thunb.
- Species Senecio arenarius Larrañaga
- Species Senecio arenarius Lange ex Nyman
- Species Senecio arenarius Salzm. ex DC.
- Species Senecio arenarius M.Bieb. accepted as Jacobaea erucifolia subsp. arenaria (Soó) B.Nord. & Greuter
- Species Senecio arenarius Besser accepted as Jacobaea erucifolia subsp. arenaria (Soó) B.Nord. & Greuter
- Species Senecio arenicola Reiche accepted as Senecio cuneatus Hook.f.
- Species Senecio areolatus Colenso accepted as Senecio sylvaticus L.
- Species Senecio arequipensis Cuatrec. accepted as Chersodoma arequipensis (Cuatrec.) Cuatrec.
- Species Senecio argaeus Boiss. & Balansa accepted as Iranecio hypochionaeus (Boiss.) C.Jeffrey
- Species Senecio argentatus S.Moore ex Rendle
- Species Senecio argentatus S.Moore accepted as Senecio sericeo-nitens Speg.
- Species Senecio argenteus Kuntze
- Species Senecio argenteus Kunze ex DC.
- Species Senecio argentinensis Speg. accepted as Senecio tweediei Hook. & Arn.
- Species Senecio argentinus Baker accepted as Senecio viravira Hieron.
- Species Senecio argillosus Baker
- Species Senecio argophylloides Griseb.
- Species Senecio argophyllus Phil. accepted as Senecio chilensis Less.
- Species Senecio argunensis Turcz. accepted as Jacobaea argunensis (Turcz.) B.Nord.
- Species Senecio argutidentatus Cuatrec. accepted as Dendrophorbium argutidentatum (Cuatrec.) H.Beltrán
- Species Senecio argutus Kunth
- Species Senecio argutus A.Rich. accepted as Senecio glomeratus Desf. ex Poir.
- Species Senecio argyreus Phil.
- Species Senecio argyrophylloides Griseb.
- Species Senecio argyrophyllus Phil.
- Species Senecio argyrotrichus Dusén
- Species Senecio aridus Greenm.
- Species Senecio aristeguietae Cuatrec.
- Species Senecio aristianus J.Rémy
- Species Senecio arizonicus Greene
- Species Senecio arleguianus J.Rémy
- Species Senecio armenius Ledeb.
- Species Senecio armenius Jaub. & Spach accepted as Iranecio lorentii (Hochst.) C.Jeffrey
- Species Senecio armentalis L.O.Williams
- Species Senecio armerifolius Franch. accepted as Cremanthodium lineare var. lineare
- Species Senecio armeriifolius Phil. accepted as Senecio scorzonerifolius Meyen & Walp.
- Species Senecio armoraciifolius Burch. ex Baker
- Species Senecio armoricanus Gand.
- Species Senecio arnaldi Cabrera
- Species Senecio arnaldii Cabrera
- Species Senecio arnassensis Gand.
- Species Senecio arnautorum Velen. accepted as Jacobaea arnautorum (Velen.) Pelser
- Species Senecio arnica E.H.L.Krause
- Species Senecio arniciflorus DC.
- Species Senecio arnicoides Wall.
- Species Senecio arnicoides Hook. & Arn.
- Species Senecio arnicoides Wall. ex C.B.Clarke accepted as Cremanthodium arnicoides (DC. ex Royle) R.D.Good
- Species Senecio arnottianus DC.
- Species Senecio arnottii Hook.f.
- Species Senecio aromaticus Gilib.
- Species Senecio aronicoides DC.
- Species Senecio aronicum Arv.-Touv.
- Species Senecio arrabidae Steud.
- Species Senecio arrgunensis Debeaux
- Species Senecio artemisiifolius Gilib.
- Species Senecio artemisiifolius Pers. accepted as Jacobaea adonidifolia (Loisel.) Pelser & Veldkamp
- Species Senecio articulatus (L.f.) Sch.Bip. accepted as Curio articulatus (L.f.) P.V.Heath
- Species Senecio arvernensis Rouy
- Species Senecio asarifolius Bojer ex DC.
- Species Senecio ascendens Bojer
- Species Senecio aschenbornianus Schauer
- Species Senecio aschenbornianus S.Schauer
- Species Senecio aschersonianus Muschl. ex Dinter accepted as Anisopappus pinnatifidus (Klatt) O.Hoffm. ex Hutch.
- Species Senecio aschersonianus Hieron. accepted as Pentacalia magnusii (Hieron.) Cuatrec.
- Species Senecio asclepiadeus (L.f.) DC. accepted as Ageratina asclepiadea (L.f.) R.M.King & H.Rob.
- Species Senecio ascotanensis Phil. accepted as Senecio rosmarinus Phil.
- Species Senecio asiaticus Schischk. & Serg. accepted as Tephroseris praticola (Schischk. & Serg.) Holub
- Species Senecio asirensis Boulos & J.R.I.Wood
- Species Senecio aspelina DC.
- Species Senecio asper Ait.
- Species Senecio asper Aiton accepted as Senecio rosmarinifolius L.f.
- Species Senecio aspericaulis J.Rémy
- Species Senecio asperifolius Franch.
- Species Senecio asperulus DC.
- Species Senecio asplenifolius Griseb.
- Species Senecio asplundii Cabrera accepted as Pentacalia asplundii (Cabrera) Cuatrec.
- Species Senecio assuayensis Sch.Bip. ex Wedd.
- Species Senecio assuayensis DC. accepted as Senecio senecioides (Kunth) Kuntze
- Species Senecio astephanus Greene
- Species Senecio atacamensis Phil.
- Species Senecio atkinsoniae F.Muell. accepted as Senecio bipinnatisectus Belcher
- Species Senecio atkinsonii C.B.Clarke accepted as Ligularia atkinsonii (C.B.Clarke) S.W.Liu
- Species Senecio atlanticus Coss. accepted as Senecio perralderianus Coss.
- Species Senecio atlanticus Boiss. & Reut. accepted as Senecio leucanthemifolius Poir.
- Species Senecio atractylidifolius Ling accepted as Synotis atractylidifolia (Ling) C.Jeffrey & Y.L.Chen
- Species Senecio atratus Greene
- Species Senecio atriapiculatus Rydb.
- Species Senecio atriplicifolius (L.) Hook. accepted as Arnoglossum atriplicifolium (L.) H.Rob.
- Species Senecio atrofuscus Grierson
- Species Senecio atropurpureus (Ledeb.) B.Fedtsch. accepted as Tephroseris integrifolia subsp. atropurpurea (Ledeb.) B.Nord.
- Species Senecio atroviolaceus Franch. accepted as Ligularia atroviolacea (Franch.) Hand.-Mazz.
- Species Senecio attenuatus Sch.Bip. ex Rusby
- Species Senecio attenuatus Sch.Bip. accepted as Senecio attenuatus Sch.Bip. ex Rusby
- Species Senecio aucheri DC. accepted as Tephroseris integrifolia subsp. aucheri (DC.) B.Nord.
- Species Senecio aucubiflorus Franch. ex H.Lév.
- Species Senecio auleticus Greene accepted as Packera hesperia (Greene) W.A.Weber & Á.Löve
- Species Senecio aurantiaca
- Species Senecio aurantiacus Rchb.
- Species Senecio aurantiacus (Hoppe ex Willd.) Less. accepted as Tephroseris integrifolia subsp. aurantiaca (Hoppe) B.Nord.
- Species Senecio auratus DC. accepted as Jacobaea paludosa subsp. lanata (Holub) B.Nord. & Greuter
- Species Senecio aurellus Rydb.
- Species Senecio aureus Georgi
- Species Senecio aureus Wall.
- Species Senecio aureus L. accepted as Packera aurea (L.) Á.Löve & D.Löve
- Species Senecio auricomus Link ex DC.
- Species Senecio auricula Bourg. ex Coss. accepted as Jacobaea auricula (Bourg. ex Coss.) Pelser
- Species Senecio auriculatissimus Britton
- Species Senecio auriculatus Wall.
- Species Senecio auriculatus Steininger
- Species Senecio auriculatus Rchb. ex Steud.
- Species Senecio auriculatus Albov
- Species Senecio auriculatus Vahl accepted as Senecio lyratus Forssk.
- Species Senecio auriculatus Poepp. ex DC. accepted as Senecio glabratus Hook. & Arn.
- Species Senecio auriculatus Desf. accepted as Senecio lividus L.
- Species Senecio auriculatus Burm.f. accepted as Emilia coccinea (Sims) G.Don
- Species Senecio aurinitens Schur
- Species Senecio auritifolius Cabrera
- Species Senecio auritus Wawra
- Species Senecio auritus Willd.
- Species Senecio auritus Lowe
- Species Senecio austinae Greene
- Species Senecio austiniae Greene accepted as Packera eurycephala var. eurycephala (Torr. & A.Gray ex A.Gray) W.A.Weber & Á.Löve
- Species Senecio austin-smithii Standl.
- Species Senecio australandinus Cabrera
- Species Senecio australis Willd.
- Species Senecio austriacus E.H.L.Krause
- Species Senecio austriacus Herborg
- Species Senecio austromontanus Hilliard
- Species Senecio austrorufescens Cuatrec. accepted as Senecio rufescens DC.
- Species Senecio autumnalis (Cariot) Gand. accepted as Jacobaea erucifolia (L.) P.Gaertn., B.Mey. & Schreb.
- Species Senecio avasimontanus Dinter accepted as Lopholaena cneorifolia (DC.) S.Moore
- Species Senecio axillaris Vell.
- Species Senecio axillaris Klatt
- Species Senecio axillifoliatus Cuatrec.
- Species Senecio ayachicus Emb. accepted as Senecio ×embergeri
- Species Senecio ayapatensis Griseb.
- Species Senecio ayapatensis Sch.Bip. ex Wedd.
- Species Senecio ayapatensis Baker
- Species Senecio ayopayensis Cuatrec. accepted as Dendrophorbium ayopayense (Cuatrec.) D.J.N.Hind
- Species Senecio azulensis Alain
- Species Senecio baberka Hutch. accepted as Emilia baberka (Hutch.) C.Jeffrey
- Species Senecio baccharidiflorus Rusby accepted as Pentacalia oronocensis (DC.) Cuatrec.
- Species Senecio baccharidifolius DC.
- Species Senecio baccharoides Kunth accepted as Gynoxys baccharoides (Kunth) Cass.
- Species Senecio bachmannii Muschl.
- Species Senecio backii Cabrera
- Species Senecio bacopoides Greenm. & Cuatrec. accepted as Pentacalia bacopoides (Greenm. & Cuatrec.) Cuatrec.
- Species Senecio badaroi Moris ex Badarò
- Species Senecio badilloi Cuatrec. accepted as Pentacalia badilloi (Cuatrec.) Cuatrec.
- Species Senecio bagshawei S.Moore accepted as Senecio subsessilis Oliv. & Hiern
- Species Senecio bahioides Hook. & Arn.
- Species Senecio bairdii S.L.Welsh
- Species Senecio bakeri Reiche
- Species Senecio bakeri Scott-Elliot accepted as Senecio madagascariensis Poir.
- Species Senecio balansae Boiss. & Reut.
- Species Senecio balansae Baker accepted as Senecio grisebachii Baker
- Species Senecio balbisianus Kar. & Kir.
- Species Senecio balbisianus DC. accepted as Tephroseris balbisiana (DC.) Holub
- Species Senecio baldensis Poir.
- Species Senecio balensis S.Ortiz & Vivero
- Species Senecio ballyi G.D.Rowley accepted as Kleinia schweinfurthii (Oliv. & Hiern) A.Berger
- Species Senecio balsamicus Phil.
- Species Senecio balsamitae Muhl.
- Species Senecio balsamitae Muhl. ex Willd. accepted as Packera paupercula (Michx.) Á.Löve & D.Löve
- Species Senecio balsapampae Cuatrec. accepted as Dendrophorbium balsapampae (Cuatrec.) B.Nord.
- Species Senecio bambuseti R.E.Fr. accepted as Mikaniopsis bambuseti (R.E.Fr.) C.Jeffrey
- Species Senecio bampsianus Lisowski
- Species Senecio bangii Rusby
- Species Senecio banksii Hook.f.
- Species Senecio baoulensis Hutch. & Dalziel
- Species Senecio baoulensis A.Chev. accepted as Gynura procumbens (Lour.) Merr.
- Species Senecio barahonensis Urb.
- Species Senecio barba-johannis DC.
- Species Senecio barbarae Cabrera
- Species Senecio barbareaefoliis Krock. accepted as Jacobaea erratica (Bertol.) Fourr.
- Species Senecio barbareifolius Turcz.
- Species Senecio barbareifolius Krock.
- Species Senecio barbareifolius (Wimm. & Grab.) Rchb. accepted as Jacobaea erratica (Bertol.) Fourr.
- Species Senecio barbatipes Hedberg accepted as Dendrosenecio elgonensis subsp. barbatipes (Hedberg) E.B.Knox
- Species Senecio barbatus DC.
- Species Senecio barbatus Don ex Hook. & Arn. accepted as Senecio pogonias Cabrera
- Species Senecio barbellatus DC. accepted as Senecio retrorsus DC.
- Species Senecio barbertonicus Klatt
- Species Senecio barckhausiifolius Boiss. & Heldr. accepted as Senecio macedonicus Griseb.
- Species Senecio barkhausioides Turcz.
- Species Senecio barkleyanus Cuatrec.
- Species Senecio barkleyi B.L.Turner
- Species Senecio baronii Humbert
- Species Senecio barorum Humbert
- Species Senecio barrelieri Hoppe ex DC.
- Species Senecio barrelieri Gouan
- Species Senecio barrosianus Cabrera
- Species Senecio bartianus Heller
- Species Senecio bartlettii Greenm.
- Species Senecio basalticus Hilliard
- Species Senecio basipinnatus Baker accepted as Senecio lyratus Forssk.
- Species Senecio basutensis Thell. accepted as Senecio umgeniensis Thell.
- Species Senecio batallonensis Cuatrec. accepted as Pentacalia batallonensis (Cuatrec.) Cuatrec.
- Species Senecio batavicus Gand.
- Species Senecio bathiaei Humbert accepted as Hubertia bathiaei (Humbert) C.Jeffrey
- Species Senecio bathurstianus (DC.) Sch.Bip.
- Species Senecio battiscombei R.E.Fr. & T.C.E.Fr. accepted as Dendrosenecio battiscombei (R.E.Fr. & T.C.E.Fr.) E.B.Knox
- Species Senecio baumgartenianus Gand.
- Species Senecio baumii O.Hoffm. accepted as Emilia baumii (O.Hoffm.) S.Moore
- Species Senecio baurii Oliv.
- Species Senecio baxteri E.F.Marshall
- Species Senecio bayonnensis Boiss.
- Species Senecio beaufilsii Kuntze
- Species Senecio beaufilsii O. K.
- Species Senecio beauverdianus (H.Lév.) H.Lév. accepted as Ixeridium beauverdianum (H.Lév.) Spring.
- Species Senecio beckii Cabrera accepted as Pentacalia beckii (Cabrera) Cuatrec.
- Species Senecio bedfordii F.Muell.
- Species Senecio beecheyanus Sch.Bip.
- Species Senecio befarioides Cuatrec. accepted as Pentacalia befarioides (Cuatrec.) Cuatrec.
- Species Senecio begoniifolius Franch. accepted as Parasenecio begoniifolius (Franch.) Y.L.Chen
- Species Senecio beguei Humbert accepted as Hubertia beguei (Humbert) C.Jeffrey
- Species Senecio behmianus Miscz.
- Species Senecio behmianus Muschl. accepted as Crassocephalum ducis-aprutii (Chiov.) S.Moore
- Species Senecio behnii Ricardi & Martic.
- Species Senecio behrianus Sond. & F.Muell. ex Sond.
- Species Senecio behrianus Sond. & F.Muell.
- Species Senecio bejucosus Cuatrec.
- Species Senecio belbeysius Delile
- Species Senecio belbeyticus Poir.
- Species Senecio belenensis Griseb.
- Species Senecio belgaumensis (Wight) C.B.Clarke
- Species Senecio bellidifolius Kunth
- Species Senecio bellidifolius DC.
- Species Senecio bellidifolius A.Rich. accepted as Emilia abyssinica var. abyssinica
- Species Senecio bellidioides Hook.f. accepted as Brachyglottis bellidioides (Hook.f.) B.Nord.
- Species Senecio bellioides Chiov. accepted as Emilia bellioides (Chiov.) C.Jeffrey
- Species Senecio bellis Harv.
- Species Senecio belophyllus J.Rémy accepted as Senecio farinifer Hook. & Arn.
- Species Senecio beltranii P.Gonzáles & Montesinos
- Species Senecio benaventianus J.Rémy
- Species Senecio benguetensis Elmer accepted as Blumea benguetensis (Elmer) Mattf.
- Species Senecio bennettii G.Simpson & J.S.Thomson accepted as Brachyglottis buchananii (J.B.Armstr.) B.Nord.
- Species Senecio benthamianus Franch.
- Species Senecio benthamii Sch.Bip. ex Wedd.
- Species Senecio benthamii Griseb. accepted as Pseudogynoxys cummingii (Benth. ex Oerst.) H.Rob. & Cuatrec.
- Species Senecio benthamii Baker accepted as Pseudogynoxys cabrerae H.Rob. & Cuatrec.
- Species Senecio bergianus E.Mey. ex DC.
- Species Senecio bergii Hieron.
- Species Senecio berlandieri (DC.) Sch.Bip.
- Species Senecio berlandieri (DC.) Hemsl. accepted as Pseudogynoxys chenopodioides (Kunth) Cabrera
- Species Senecio bernardinus Greene accepted as Packera bernardina (Greene) W.A.Weber & Á.Löve
- Species Senecio bernoullianus Greenm. accepted as Pseudogynoxys haenkei (DC.) Cabrera
- Species Senecio berterianus DC.
- Species Senecio berteroanus Colla accepted as Senecio glabratus Hook. & Arn.
- Species Senecio berteroi (DC.) Pelser
- Species Senecio bertramii Post
- Species Senecio berythaeus A.Camus & Gomb.
- Species Senecio besserianus Minderova accepted as Tephroseris integrifolia subsp. aurantiaca (Hoppe) B.Nord.
- Species Senecio betonicifolius DC.
- Species Senecio betsiliensis Baker accepted as Senecio hypargyraeus DC.
- Species Senecio bhot C.B.Clarke accepted as Synotis bhot (C.B.Clarke) C.Jeffrey & Y.L.Chen
- Species Senecio bhutanicus N.P.Balakr. accepted as Parasenecio quinquelobus var. quinquelobus
- Species Senecio biacuminatus Rusby accepted as Dendrophorbium biacuminatum (Rusby) C.Jeffrey
- Species Senecio biafrae Oliv. & Hiern accepted as Solanecio biafrae (Oliv. & Hiern) C.Jeffrey
- Species Senecio bicolor Balb.
- Species Senecio bicolor Viv.
- Species Senecio bicolor Ces., Pass. & Gibelli
- Species Senecio bicolor Sch.Bip. accepted as Gynura bicolor (Roxb. ex Willd.) DC.
- Species Senecio bicolor (Willd.) Tod. accepted as Jacobaea maritima subsp. bicolor (Willd.) B.Nord. & Greuter
- Species Senecio bidentatus Willd.
- Species Senecio bidwillii Hook.f. accepted as Brachyglottis bidwillii (Hook.f.) B.Nord.
- Species Senecio biebersteinii Grecescu
- Species Senecio bifistulosus Hook.f. accepted as Brachyglottis bifistulosa (Hook.f.) B.Nord.
- Species Senecio biflorus Vahl
- Species Senecio biflorus Burm.f. accepted as Gynura pseudochina (L.) DC.
- Species Senecio bigelovii A.Gray
- Species Senecio biligulatus W.W.Sm.
- Species Senecio billardierei F.Muell. accepted as Bedfordia linearis (Labill.) DC.
- Species Senecio billieturneri T.M.Barkley
- Species Senecio bipartitus Sch.Bip. ex Deflers
- Species Senecio bipinnatifidus Hook. & Arn.
- Species Senecio bipinnatisectus Belcher
- Species Senecio bipinnatus (Thunb.) Less.
- Species Senecio bipinnatus DC.
- Species Senecio bipontinii Wedd.
- Species Senecio birubonensis Kitam. accepted as Tephroseris phaeantha (Nakai) C.Jeffrey & Y.L.Chen
- Species Senecio biseriatus Alain
- Species Senecio biserratus Belcher
- Species Senecio biserrifolius Kuntze accepted as Dendrophorbium biserrifolium (Kuntze) D.J.N.Hind
- Species Senecio bithynicus J.Calvo
- Species Senecio bivestitus Cronquist accepted as Tephroseris lindstroemii (Ostenf.) Á.Löve & D.Löve
- Species Senecio blanchei Soldano
- Species Senecio blattariifolia Franch. accepted as Senecio nudicaulis Buch.-Ham. ex D.Don
- Species Senecio blattariifolius Franch.
- Species Senecio blattarioides (DC.) DC. accepted as Senecio oxyodontus DC.
- Species Senecio blinii H.Lév. accepted as Jacobaea argunensis (Turcz.) B.Nord.
- Species Senecio blitoides Greene accepted as Senecio fremontii var. blitoides (Greene) Cronquist
- Species Senecio blochmanae Greene
- Species Senecio blumeanus Sch.Bip.
- Species Senecio blumei DC. accepted as Cissampelopsis volubilis (Blume) Miq.
- Species Senecio blumeri Greene accepted as Packera neomexicana var. toumeyi (Greene) Trock & T.M.Barkley
- Species Senecio bodinieri Vaniot accepted as Sinosenecio bodinieri (Vaniot) B.Nord.
- Species Senecio boelckei Cabrera
- Species Senecio bogdanowicii Kom.
- Species Senecio bogoroensis De Wild. accepted as Solanecio mannii (Hook.f.) C.Jeffrey
- Species Senecio bogotensis Spreng. accepted as Pseudogynoxys bogotensis (Spreng.) Cuatrec.
- Species Senecio bohemicus Domin
- Species Senecio bohemicus Tausch accepted as Jacobaea paludosa (L.) G.Gaertn., B.Mey. & Scherb.
- Species Senecio boikoanus (Vorosch. & Schlothg.) Vorosch.
- Species Senecio boissieri DC. accepted as Jacobaea boissieri (DC.) Pelser
- Species Senecio boiteaui Humbert
- Species Senecio boivinii Klatt
- Species Senecio bojeri Hook.f.
- Species Senecio bojeri DC. accepted as Solanecio angulatus (Vahl) C.Jeffrey
- Species Senecio bolanderi A.Gray accepted as Packera bolanderi var. bolanderi (A.Gray) W.A.Weber & Á.Löve
- Species Senecio bolivarianus Cuatrec.
- Species Senecio boliviensis Sch.Bip. ex Klatt
- Species Senecio boliviensis Sch.Bip. accepted as Senecio boliviensis Sch.Bip. ex Klatt
- Species Senecio bollei Sunding & G.Kunkel
- Species Senecio boluangensis H.Koyama
- Species Senecio bolusii Oliv. accepted as Phaneroglossa bolusii (Oliv.) B.Nord.
- Species Senecio bomani R.E.Fr.
- Species Senecio bomanii R.E.Fr.
- Species Senecio bombayensis N.P.Balakr.
- Species Senecio bombycopholis Bullock
- Species Senecio bonariensis Hook. & Arn.
- Species Senecio boninsimae Yatabe.
- Species Senecio bonplandianus DC.
- Species Senecio boquetensis Standl. accepted as Talamancalia boquetensis (Standl.) H.Rob. & Cuatrec.
- Species Senecio borchersii Phil. accepted as Senecio bustillosianus J.Rémy
- Species Senecio borii Raizada accepted as Synotis borii (Raizada) R.Mathur
- Species Senecio bornmuelleri Pit.
- Species Senecio bornmuellerianus accepted as Iranecio bulghardaghensis (Soldano) D.Heller
- Species Senecio boryanus Sch.Bip.
- Species Senecio borysthenicus (DC.) Andrz.
- Species Senecio borysthenicus Andrz. ex Schischk.
- Species Senecio borysthenicus (DC.) Andrz. ex Czern. accepted as Jacobaea borysthenica (DC.) B.Nord. & Greuter
- Species Senecio borysthenius Andrz. ex DC.
- Species Senecio boscianus Sch.Bip. accepted as Arnoglossum ovatum (Walter) H.Rob.
- Species Senecio bosniacus G.Beck. accepted as Tephroseris crassifolia (Schult.) Griseb. & Schenk
- Species Senecio botijae C.Ehrh.
- Species Senecio botryodes C.Winkl. accepted as Ligularia botryodes (C.Winkl.) Hand.-Mazz.
- Species Senecio boutonii Baker accepted as Senecio madagascariensis var. boutonii (Baker) Humbert
- Species Senecio bowenkampi Phil. accepted as Senecio microphyllus Phil.
- Species Senecio boyacensis (Cuatrec.) Cuatrec. accepted as Culcitium canescens Humb. & Bonpl.
- Species Senecio brachyantherus (Hiern) S.Moore
- Species Senecio brachyanthus Greenm. accepted as Roldana chapalensis (S.Watson) H.Rob. & Brettell
- Species Senecio brachyatus Jord. ex Boreau
- Species Senecio brachycephalus R.E.Fr. accepted as Emilia brachycephala (R.E.Fr.) C.Jeffrey
- Species Senecio brachychaetus Cufod. accepted as Tephroseris longifolia subsp. brachychaeta Greuter
- Species Senecio brachychaetus DC. accepted as Tephroseris longifolia (Jacq.) Griseb. & Schenk
- Species Senecio brachycodon Baker
- Species Senecio brachyglossus F.Muell. ex Sond.
- Species Senecio brachyglossus F.Muell. ex Benth. accepted as Senecio glossanthus (Sond.) Belcher
- Species Senecio brachyglossus Turcz. accepted as Senecio glutinosus Thunb.
- Species Senecio brachylaenus DC.
- Species Senecio brachylepis Phil. accepted as Senecio anthemidiphyllus J.Rémy
- Species Senecio brachylobus Phil.
- Species Senecio brachypodus DC.
- Species Senecio brachyrhynchoides DC.
- Species Senecio bracteatus Klatt accepted as Senecio sennikovii Kottaim.
- Species Senecio bracteatus Boiss. & Orph. accepted as Senecio macedonicus Griseb.
- Species Senecio bracteolatus Hook. & Arn.
- Species Senecio bracteolatus Phil.
- Species Senecio bracteolatus Hook.f. accepted as Senecio albopurpureus Kitam.
- Species Senecio bracteosus J.Rémy accepted as Senecio cumingii Hook. & Arn.
- Species Senecio bradei Cabrera
- Species Senecio brasiliensis (Spreng.) Less.
- Species Senecio brasiliensis Spreng. ex Baker
- Species Senecio brassica R.E.Fr. & T.C.E.Fr. accepted as Dendrosenecio keniensis (Baker f.) Mabb.
- Species Senecio brassiciformis R.E.Fr. & T.C.E.Fr. accepted as Dendrosenecio brassiciformis (R.E.Fr. & T.C.E.Fr.) Mabb.
- Species Senecio brassii Belcher
- Species Senecio bravensis Cabrera
- Species Senecio breanus Phil.
- Species Senecio brenesii Greenm. & Standl.
- Species Senecio breviculus Phil. accepted as Senecio subdiscoideus Sch.Bip. ex Wedd.
- Species Senecio brevidentatus M.D.Hend.
- Species Senecio breviflorus (Kadereit) Greuter
- Species Senecio breviligulatus Hieron. accepted as Pentacalia breviligulata (Hieron.) Cuatrec.
- Species Senecio brevilimbus (S.Moore) S.Moore accepted as Senecio flavus (Decne.) Sch.Bip.
- Species Senecio brevilingueus F.Muell.
- Species Senecio brevilorus Hilliard
- Species Senecio brevior Gand.
- Species Senecio breviramulus Tortosa & Adr.Bartoli
- Species Senecio breviscapus DC.
- Species Senecio breviscapus (DC.) Sch.Bip.
- Species Senecio breviscapus (DC.) H.Jacobsen accepted as Senecio cicatricosus Sch.Bip.
- Species Senecio brevitubulus I.Thomps.
- Species Senecio breweri Burtt Davy accepted as Packera breweri (Burtt Davy) W.A.Weber & Á.Löve
- Species Senecio breyeri (S.Moore) S.Moore accepted as Senecio polyodon var. polyodon DC.
- Species Senecio bridgesii Hook. & Arn.
- Species Senecio brigalowensis I.Thomps.
- Species Senecio brittonianus Hieron.
- Species Senecio brittonii Greenm. accepted as Antillanthus almironcillo (M.Gómez) B.Nord.
- Species Senecio brownii F.Muell.
- Species Senecio brownii R.Vig. & Humbert accepted as Senecio myricaefolius (Bojer ex DC.)
- Species Senecio brunneo-villosus M.Kitamura
- Species Senecio brunonianus Hook. & Arn.
- Species Senecio brunonis (Hook.f.) J.H.Willis
- Species Senecio bryoniifolius Harv.
- Species Senecio buchananii J.B.Armstr. accepted as Brachyglottis buchananii (J.B.Armstr.) B.Nord.
- Species Senecio bucharicus C.Winkl.
- Species Senecio buchii Urb.
- Species Senecio buchtienii Greenm. accepted as Dendrophorbium buchtienii (Greenm.) C.Jeffrey
- Species Senecio buchwaldii O.Hoffm. accepted as Solanecio buchwaldii (O.Hoffm.) C.Jeffrey
- Species Senecio bugalagrandis Cuatrec.
- Species Senecio buglossa Phil.
- Species Senecio buglossus Phil.
- Species Senecio buimalia Buch.-Ham. ex D.Don
- Species Senecio bujedoanus Elias & Pau
- Species Senecio bulbiferus Maxim. accepted as Parasenecio farfarifolia var. bulbifera (Maxim.) H.Koyama
- Species Senecio bulbinifolius DC.
- Species Senecio bulbosus Sch.Bip.
- Species Senecio bulbosus Hook. & Arn. ex Levl.
- Species Senecio bulgaricus Velen. accepted as Senecio nemorensis subsp. bulgaricus (Velen.) Greuter
- Species Senecio bulghardaghensis Soldano accepted as Iranecio bulghardaghensis (Soldano) D.Heller
- Species Senecio bullatus Benth. accepted as Senecio patens (Kunth) DC.
- Species Senecio bulleyanus Diels
- Species Senecio bungeanus Maxim. ex Herder
- Species Senecio bungei Franch. accepted as Ligularia thomsonii (C.B.Clarke) Pojark.
- Species Senecio bupleuriformis (Sch.Bip.) Sch.Bip. accepted as Senecio glaberrimus DC.
- Species Senecio bupleuroides DC.
- Species Senecio burchellii DC.
- Species Senecio burchellii Cabrera accepted as Senecio madagascariensis Poir.
- Species Senecio burkartii Cabrera
- Species Senecio burkei Greenm. accepted as Packera indecora (Greene) Á.Löve & D.Löve
- Species Senecio burtonii Hook.f.
- Species Senecio buschianus Sosn. accepted as Jacobaea buschiana (Sosn.) B.Nord. & Greuter
- Species Senecio bussei Muschl. accepted as Senecio purpureus L.
- Species Senecio bustillosianus J.Rémy
- Species Senecio butaguensis Muschl. accepted as Crassocephalum montuosum (S.Moore) Milne-Redh.
- Species Senecio buxifolius Kunth accepted as Gynoxys buxifolia (Kunth) Cass.
- Species Senecio byrnensis Hilliard
- Species Senecio byzantinus Willd.
- Species Senecio byzantinus L.
- Species Senecio cabrerae Cuatrec. accepted as Dendrophorbium cabrerae (Cuatrec.) C.Jeffrey
- Species Senecio cabrerianus Greenm. & Cuatrec. accepted as Dendrophorbium cabrerianum (Greenm. & Cuatrec.) C.Jeffrey
- Species Senecio cacaliaster Lam.
- Species Senecio cacaliaster Guss. ex DC.
- Species Senecio cacaliaster Blanco
- Species Senecio cacaliiformis Rchb.f.
- Species Senecio cacalioides Fisch.
- Species Senecio cacalioides Fisch. ex Spreng. accepted as Erechtites hieraciifolius var. cacalioides (Fisch. ex Spreng.) Less. ex Griseb.
- Species Senecio cacaosensis Cuatrec. accepted as Pentacalia cacaosensis (Cuatrec.) Cuatrec.
- Species Senecio cachacoensis Cuatrec.
- Species Senecio cachinalensis Phil.
- Species Senecio cacteaeformis (Klatt) Klatt accepted as Othonna graveolens O.Hoffm.
- Species Senecio cadiriensis Cuatrec.
- Species Senecio cadiscus B.Nord. & Pelser
- Species Senecio caducifolius Sch.Bip. ex Wedd.
- Species Senecio caespitosus Brot. accepted as Senecio pyrenaicus subsp. caespitosus (Brot.) Franco1
- Species Senecio caespitosus Phil. accepted as Senecio subdiscoideus Sch.Bip. ex Wedd.
- Species Senecio cahallii
- Species Senecio cahillii Belcher accepted as Senecio diaschides D.G.Drury
- Species Senecio cajamarquillensis Cabrera
- Species Senecio cajonensis Cabrera
- Species Senecio cakilefolius DC.
- Species Senecio calachaquensis Cabrera
- Species Senecio calamifolius Hook. accepted as Senecio scaposus var. scaposus DC.
- Species Senecio calamitosus Klatt accepted as Senecio erechtitioides Baker
- Species Senecio calcadensis Ramaswami accepted as Cissampelopsis calcadensis (Ramaswami) C.Jeffrey & Y.L.Chen
- Species Senecio calcalioides Meyen
- Species Senecio calcarius Kunth accepted as Senecio mairetianus DC.
- Species Senecio calceiflorus Cabrera accepted as Senecio filaginoides DC.
- Species Senecio calcensis Cabrera & Zardini
- Species Senecio calchaquinus Cabrera
- Species Senecio calcicola Meyen & Walp. accepted as Senecio calcensis Cabrera & Zardini
- Species Senecio caldasensis Cuatrec. accepted as Senecio involucratus (Kunth) DC.
- Species Senecio caledoniae (Biehler) Schlecht. ex DC. accepted as Brachyglottis caledoniae (Biehler) DC.
- Species Senecio calianus Cuatrec.
- Species Senecio californicus DC.
- Species Senecio calingastensis Tombesi
- Species Senecio callacallensis Cuatrec. accepted as Dorobaea callacallensis (Cuatrec.) B.Nord. & Pruski
- Species Senecio callimocephalus S.Moore
- Species Senecio callosus Sch.Bip.
- Species Senecio calocephalus C.C.Chang
- Species Senecio calocephalus Poepp. & Endl.
- Species Senecio calocephalus Chang
- Species Senecio calocephalus Hemsley
- Species Senecio calocephalus Hemsl. accepted as Pseudogynoxys chenopodioides (Kunth) Cabrera
- Species Senecio caloneotes Hilliard
- Species Senecio calophyllus Hemsl.
- Species Senecio caloxanthus Diels accepted as Ligularia caloxantha (Diels) Hand.-Mazz.
- Species Senecio calthifolius Hook.f.
- Species Senecio calthifolius (Maxim.) Maxim. accepted as Ligularia calthifolia Maxim.
- Species Senecio calvertii Boiss. accepted as Senecio viscosus L.
- Species Senecio calvescens Moris & De Not.
- Species Senecio calvus Cuatrec.
- Species Senecio calyculatus Greenm.
- Species Senecio cambrensis Rosser
- Species Senecio campanae Phil. accepted as Senecio anthemidiphyllus J.Rémy
- Species Senecio campanellifer Cuatrec.
- Species Senecio campanelliferus Cuatrec.
- Species Senecio campanulatus Franch. accepted as Cremanthodium campanulatum var. campanulatum
- Species Senecio campanulatus Sch.Bip. accepted as Senecio betonicifolius DC.
- Species Senecio campanulatus Sch.Bip. ex Klatt accepted as Senecio betonicifolius DC.
- Species Senecio campester (Retz.) DC.
- Species Senecio campester Śleńdz.
- Species Senecio campestris Hook.f.
- Species Senecio campestris F.B.Forbes & Hemsl.
- Species Senecio campestris (Retz.) DC. accepted as Tephroseris integrifolia (L.) Holub
- Species Senecio campii Cuatrec. accepted as Pentacalia campii (Cuatrec.) Cuatrec.
- Species Senecio camporum Greenm.
- Species Senecio camporum Gardner accepted as Senecio adamantinus Bong.
- Species Senecio camptodontus Franch. accepted as Senecio wightii (DC. ex Wight) Benth. ex C.B.Clarke
- Species Senecio campylocarpus I.Thomps.
- Species Senecio campylodes DC. accepted as Senecio scandens var. scandens
- Species Senecio canabyi Humbert
- Species Senecio canadensis L.
- Species Senecio canaliculatus Bojer ex DC.
- Species Senecio canaliculatus Bojer
- Species Senecio canalipes DC.
- Species Senecio canalipes E.Mey.
- Species Senecio cancellatus (Rud.) P. DC.
- Species Senecio cancellatus DC.
- Species Senecio canchahuinganquensis Cabrera
- Species Senecio candelariae Benth.
- Species Senecio candicans Wall. ex DC.
- Species Senecio candidans DC.
- Species Senecio candidissimus Greene
- Species Senecio candidus (C.Presl) DC. accepted as Jacobaea candida (C.Presl) B.Nord. & Greuter
- Species Senecio candolleanus Wall. ex DC.
- Species Senecio candolleanus Wall.
- Species Senecio candolleanus Sosn. accepted as Senecio leucanthemifolius subsp. caucasicus (DC.) Greuter
- Species Senecio candolleanus Hook. & Arn. accepted as Senecio leucopeplus Cabrera
- Species Senecio candollei Wedd.
- Species Senecio candollii Wedd.
- Species Senecio canescens Bernh. ex DC.
- Species Senecio canescens (Humb. & Bonpl.) Cuatrec. accepted as Culcitium canescens Humb. & Bonpl.
- Species Senecio canicida Sessé & Moc.
- Species Senecio canicidus Ehrenb.
- Species Senecio canicidus Sessé & Moc. accepted as Roldana ehrenbergiana (Klatt) H.Rob. & Brettell
- Species Senecio cannabifolius Less. accepted as Jacobaea cannabifolia (Less.) E.Wiebe
- Species Senecio cannabinifolius Hook. & Arn. accepted as Senecio brasiliensis (Spreng.) Less.
- Species Senecio canopurpurens Cuatrec.
- Species Senecio cano-purpureus Cuatrec.
- Species Senecio canovirens Rydb. accepted as Packera fendleri (A.Gray) W.A.Weber & Á.Löve
- Species Senecio cantabricus Willk. accepted as Tephroseris helenitis (L.) B.Nord.
- Species Senecio cantensis Cabrera
- Species Senecio canus Pourr. ex Willk. & Lange
- Species Senecio canus Hook. accepted as Packera cana (Hook.) W.A.Weber & Á.Löve
- Species Senecio caparaoensis Cabrera
- Species Senecio capcirensis Sennen accepted as Tephroseris helenitis (L.) B.Nord.
- Species Senecio capillarifolius Speg. accepted as Senecio chrysocomoides Hook. & Arn.
- Species Senecio capillaris Gaudich.
- Species Senecio capillifolius Hook.f.
- Species Senecio capitatus (Wahlenb.) Steud. accepted as Tephroseris integrifolia subsp. capitata (Wahlenb.) B.Nord.
- Species Senecio cappa Buch.-Ham. ex D.Don
- Species Senecio cappadocicus Boiss. accepted as Iranecio hypochionaeus (Boiss.) C.Jeffrey
- Species Senecio capuronii Humbert
- Species Senecio caracasanus Klatt accepted as Pentacalia caracasana (Klatt) Cuatrec.
- Species Senecio caranianus Chiov. accepted as Solanecio nandensis (S.Moore) C.Jeffrey
- Species Senecio carbonelli S.Díaz
- Species Senecio carbonellii S.Díaz
- Species Senecio carbonensis C.Ezcurra, M.Ferreyra & S.Clayton
- Species Senecio carchiensis Cuatrec. accepted as Pentacalia carchiensis (Cuatrec.) Cuatrec.
- Species Senecio cardamine Greene accepted as Packera cardamine (Greene) W.A.Weber & Á.Löve
- Species Senecio cardaminifolius DC.
- Species Senecio cardenasii Cuatrec. accepted as Pentacalia cardenasii (Cuatrec.) Cuatrec.
- Species Senecio cardiophyllus Hemsl. accepted as Senecio sessilifolius (Hook. & Arn.) Hemsl.
- Species Senecio carduifolius (Cass.) Desf. accepted as Erechtites hieraciifolius var. cacalioides (Fisch. ex Spreng.) Less. ex Griseb.
- Species Senecio carhuanishoensis H.Beltrán & J.Calvo
- Species Senecio caricifolius Hook. & Arn.
- Species Senecio cariensis Boiss. accepted as Iranecio cariensis (Boiss.) C.Jeffrey
- Species Senecio carinatus Greenm.
- Species Senecio carlomasonii B.L.Turner & T.M.Barkley accepted as Roldana hartwegii (Benth.) H.Rob. & Brettell
- Species Senecio carnerensis Greenm.
- Species Senecio carnifolius Cabrera accepted as Senecio bipontinii Wedd.
- Species Senecio carniolicus Willd. accepted as Jacobaea incana subsp. carniolica (Willd.) B.Nord. & Greuter
- Species Senecio carnosulifolius S.Moore
- Species Senecio carnosulus (Kirk) C.J.Webb
- Species Senecio carnosus Thunb.
- Species Senecio carnosus C.Presl
- Species Senecio carnosus Lam.
- Species Senecio carnosus Phil. accepted as Senecio nublensis Soldano
- Species Senecio carnulentus DC.
- Species Senecio caroli C.Winkl. accepted as Sinacalia caroli (C.Winkl.) C.Jeffrey & Y.L.Chen
- Species Senecio caroli-malyi Horvatić accepted as Senecio leucanthemifolius Poir.
- Species Senecio carolinianus Spreng. accepted as Packera glabella (Poir.) C.Jeffrey
- Species Senecio caroli-tertii Cuatrec. accepted as Pentacalia tolimensis (Sch.Bip. ex Wedd.) Cuatrec.
- Species Senecio carpathicus Herbich accepted as Jacobaea abrotanifolia subsp. carpathica (Herbich) B.Nord. & Greuter
- Species Senecio carpetanus Boiss. & Reut.
- Species Senecio carpishensis Cuatrec. accepted as Pentacalia carpishensis (Cuatrec.) Cuatrec.
- Species Senecio carrikeri Cuatrec. accepted as Pentacalia carrikeri (Cuatrec.) Cuatrec.
- Species Senecio carroensis DC.
- Species Senecio carstenszensis P.Royen accepted as Papuacalia carstenszensis (P.Royen) Veldkamp
- Species Senecio carthagenensis DC.
- Species Senecio carthamoides Greene accepted as Senecio fremontii var. blitoides (Greene) Cronquist
- Species Senecio caryophyllus Mattf.
- Species Senecio casapaltensis Ball
- Species Senecio caspicus Less.
- Species Senecio cassinioides Hook.f. accepted as Brachyglottis cassinioides (Hook.f.) B.Nord.
- Species Senecio castagneanus DC.
- Species Senecio castanaefolius DC.
- Species Senecio castaneifolius DC.
- Species Senecio castaneifolius Sch.Bip.
- Species Senecio castoreus S.L.Welsh accepted as Packera castoreus (S.L.Welsh) Kartesz
- Species Senecio catamarcensis Cabrera
- Species Senecio catharinensis Dusén ex Cabrera
- Species Senecio catharinensis Dusén accepted as Dendrophorbium catharinense (Dusén ex Cabrera) C.Jeffrey
- Species Senecio cathcartensis O.Hoffm.
- Species Senecio caucasica
- Species Senecio caucasicus (M.Bieb.) DC. accepted as Dolichorrhiza caucasica (M.Bieb.) Galushko
- Species Senecio caucasigenus Schischk. accepted as Tephroseris integrifolia subsp. caucasigena (Schischk.) Greuter
- Species Senecio caudatus DC.
- Species Senecio caulanthifolius Burtt Davy
- Species Senecio caulopterus Harv. accepted as Senecio scoparius Harv.
- Species Senecio caulopterus accepted as Senecio scoparius Harv.
- Species Senecio caulopterus DC. accepted as Senecio inornatus DC.
- Species Senecio cavaleriei H.Lév. accepted as Synotis cavaleriei (H.Lév.) C.Jeffrey & Y.L.Chen
- Species Senecio cayambensis Cuatrec. accepted as Senecio mojandensis Hieron.
- Species Senecio cebennensis Rouy
- Species Senecio cedrorum Raynal
- Species Senecio cedrosensis Greene
- Species Senecio celtibericus Pau accepted as Senecio carpetanus Boiss. & Reut.
- Species Senecio cenomanensis Gand.
- Species Senecio centropappus F.Muell.
- Species Senecio cephalophorus (Compton) H.Jacobsen accepted as Kleinia cephalophora Compton
- Species Senecio ceratophylloides Griseb.
- Species Senecio ceratophyllus Nees
- Species Senecio ceratophyllus Don ex Hook. & Arn. accepted as Senecio ceratophylloides Griseb.
- Species Senecio cerberoanus J.Rémy
- Species Senecio cernuiflorus Cabrera accepted as Senecio serratifolius (Meyen & Walp.) Cuatrec.
- Species Senecio cernuus A.Gray accepted as Senecio pudicus Greene
- Species Senecio cernuus Phil. accepted as Senecio serratifolius (Meyen & Walp.) Cuatrec.
- Species Senecio cernuus L.f. accepted as Crassocephalum rubens var. rubens
- Species Senecio cerrateae Cabrera
- Species Senecio cerratei Cabrera
- Species Senecio cervariaefolius (DC.) Hemsl.
- Species Senecio cervariifolius
- Species Senecio cervariifolius Sch.Bip.
- Species Senecio cervi-cornis Phil. accepted as Senecio illinitus Phil.
- Species Senecio cervilingua Sch.Bip. ex Wedd.
- Species Senecio chabertii Gand.
- Species Senecio chabertii Cariot
- Species Senecio chabertii Petitm. accepted as Jacobaea uniflora (All.) Veldkamp
- Species Senecio chachaniensis Cuatrec.
- Species Senecio chachapoyensis Greenm. accepted as Pentacalia chachapoyensis (Greenm.) Cuatrec.
- Species Senecio chaenocephalus Cabrera accepted as Dendrophorbium chaenocephalum (Cabrera) C.Jeffrey
- Species Senecio chalureaui Humbert
- Species Senecio chamaecephalus Wedd. accepted as Senecio breviscapus DC.
- Species Senecio chamaedrifolius Less. accepted as Senecio nigrescens Hook. & Arn.
- Species Senecio chamaemelifolius DC. accepted as Senecio diffusus L.f.
- Species Senecio chamomillefolius Phil.
- Species Senecio chamomillifolius Phil.
- Species Senecio chanaralensis Phil.
- Species Senecio changii C.Ren & Q.E.Yang
- Species Senecio chapacensis Greene
- Species Senecio chapalensis S.Watson
- Species Senecio chaquiroensis Greenm. accepted as Pentacalia chaquiroensis (Greenm.) Cuatrec.
- Species Senecio charaguensis Cuatrec. accepted as Senecio hieronymi Griseb.
- Species Senecio chassanicus Barkalov
- Species Senecio chavanilloensis Cuatrec.
- Species Senecio cheesemanii Hook.f. accepted as Brachyglottis myrianthos (Cheeseman) D.G.Drury
- Species Senecio cheiranthifolius Kunth accepted as Packera bellidifolia (Kunth) W.A.Weber & Á.Löve
- Species Senecio chenopodifolius DC. accepted as Parasenecio chenopodiifolius (DC.) Grierson
- Species Senecio chenopodioides Kunth accepted as Pseudogynoxys chenopodioides (Kunth) Cabrera
- Species Senecio cheranganiensis Cotton & Blakelock accepted as Dendrosenecio cheranganiensis subsp. cheranganiensis
- Species Senecio chersodomus Reiche accepted as Chersodoma candida Phil.
- Species Senecio chiapensis Hemsl. accepted as Digitacalia chiapensis (Hemsl.) Pippen
- Species Senecio chicharrensis Greenm.
- Species Senecio chienii Hand.-Mazz. accepted as Sinosenecio chienii (Hand.-Mazz.) B.Nord.
- Species Senecio chihuahuensis S.Watson
- Species Senecio chilensis Less.
- Species Senecio chilensis Cabrera
- Species Senecio chilensis Baker accepted as Senecio montevidensis (Spreng.) Baker
- Species Senecio chillaloensis Cufod. ex Hedberg
- Species Senecio chillaloensis Cufod. accepted as Senecio schultzii subsp. chillaloensis (Cufod. ex Hedberg) S.Ortiz & Vivero
- Species Senecio chillanensis Cabrera
- Species Senecio chiloensis Phil. accepted as Senecio otites Kunze ex DC.
- Species Senecio chinensis (Spreng.) DC. accepted as Senecio scandens var. scandens
- Species Senecio chingualensis Cuatrec.
- Species Senecio chinotegensis Klatt accepted as Pseudogynoxys haenkei (DC.) Cabrera
- Species Senecio chionogeton Wedd.
- Species Senecio chionopappus Sch.Bip.
- Species Senecio chionophilus Phil.
- Species Senecio chionotus Phil. accepted as Senecio haenkei DC.
- Species Senecio chiovendeanus Muschl. accepted as Emilia chiovendeana (Muschl.) Lisowski
- Species Senecio chipauquilensis Troiani & Steibel
- Species Senecio chiquianensis Cabrera
- Species Senecio chiribogae Cabrera
- Species Senecio chirripoensis H.Rob. & Brettell
- Species Senecio chitaganus Cuatrec.
- Species Senecio chloranthus Greene
- Species Senecio chlorocephalus Muschl. accepted as Senecio hochstetteri Sch.Bip. ex A.Rich.
- Species Senecio choczensis Holub
- Species Senecio chodatianus Cuatrec.
- Species Senecio choiquelauensis Speg.
- Species Senecio chola W.W.Sm. accepted as Parasenecio chola (W.W.Sm.) Y.L.Chen
- Species Senecio chordifolius Hook.f.
- Species Senecio choroensis Cuatrec.
- Species Senecio chrismarii Greenm. accepted as Roldana hederifolia (Hemsl.) H.Rob. & Brettell
- Species Senecio christensenii Cockayne accepted as Brachyglottis christensenii (Cockayne) B.Nord.
- Species Senecio chronotus Phil.
- Species Senecio chrysactia Sch.Bip.
- Species Senecio chrysactis Sch.Bip. ex Hensl.
- Species Senecio chrysanthemifolius Moretti
- Species Senecio chrysanthemifolius Biv.
- Species Senecio chrysanthemifolius DC. accepted as Senecio glaucus subsp. coronopifolius (Maire) C.Alexander
- Species Senecio chrysanthemifolius Poir. accepted as Senecio squalidus subsp. chrysanthemifolius (Poir.) Greuter
- Species Senecio chrysanthemoides DC.
- Species Senecio chrysanthemoides Schrank
- Species Senecio chrysanthemoides Phil. accepted as Senecio alcicornis Hook. & Arn.
- Species Senecio chrysanthemum Dusén
- Species Senecio chrysanthus Greenm.
- Species Senecio chrysocoma Meerb.
- Species Senecio chrysocomoides Hook. & Arn.
- Species Senecio chrysolepis Phil.
- Species Senecio chubutensis Speg. accepted as Senecio chrysocomoides Hook. & Arn.
- Species Senecio chulumanicus Cabrera accepted as Pentacalia chulumanica (Cabrera) Cuatrec.
- Species Senecio chungtienensis C.Jeffrey & Y.L.Chen
- Species Senecio cicatricosus Sch.Bip.
- Species Senecio cicatricosus Baker accepted as Senecio canaliculatus Bojer ex DC.
- Species Senecio cichoriifolius H.Lév. accepted as Synotis duclouxii (Dunn) C.Jeffrey & Y.L.Chen
- Species Senecio cicutarius Steven ex DC.
- Species Senecio ciliatus Walter accepted as Erigeron canadensis L.
- Species Senecio cilicius Boiss. accepted as Jacobaea cilicia (Boiss.) B.Nord.
- Species Senecio ciliolatus DC.
- Species Senecio cinarifolius H.Lév.
- Species Senecio cineraria DC. accepted as Jacobaea maritima (L.) Pelser & Meijden
- Species Senecio cinerariae Spreng.
- Species Senecio cinerarioides Kunth
- Species Senecio cinerarioides A.Rich.
- Species Senecio cinerarioides Viv.
- Species Senecio cinerarius St.-Lag.
- Species Senecio cinerascens Aiton
- Species Senecio cinerascens Ait.
- Species Senecio cinereus Moretti
- Species Senecio cinereus Colla
- Species Senecio cinereus (Velen.) Velen. accepted as Jacobaea erucifolia subsp. arenaria (Soó) B.Nord. & Greuter
- Species Senecio ciroilingua Sch.Bip.
- Species Senecio cirsiifolius (Hook. & Arn.) Sch.Bip.
- Species Senecio cirsiifolius (Hook. & Arn.) Hemsl. accepted as Senecio cirsiifolius (Hook. & Arn.) Sch.Bip.
- Species Senecio cirsioides Hemsl.
- Species Senecio cisplatinus Cabrera
- Species Senecio cissampelinus (DC.) Sch.Bip. accepted as Mikaniopsis cissampelina (DC.) C.Jeffrey
- Species Senecio citriceps Hilliard & B.L.Burtt
- Species Senecio citriformis G.D.Rowley
- Species Senecio citrinus (DC.) Voss
- Species Senecio cladobotrys Ledeb. accepted as Tephroseris cladobotrys (Ledeb.)
- Species Senecio claessensii (De Wild.) Humbert & Staner accepted as Gynura amplexicaulis Oliv. & Hiern
- Species Senecio clarenceanus Hook.f. accepted as Senecio purpureus L.
- Species Senecio clarioneifolius J.Rémy
- Species Senecio clarkeanus Franch. accepted as Cremanthodium nanum (Decne.) W.W.Sm.
- Species Senecio clarkianus A.Gray
- Species Senecio claryae B.L.Turner
- Species Senecio claussenii Decne.
- Species Senecio clavatus Hauman accepted as Senecio hickenii Hauman
- Species Senecio clavifolius Rusby accepted as Senecio potosianus Klatt
- Species Senecio claviseta Pomel accepted as Senecio flavus (Decne.) Sch.Bip.
- Species Senecio cleeffii Cuatrec.
- Species Senecio cleefii Cuatrec. accepted as Pentacalia cleefii (Cuatrec.) Cuatrec.
- Species Senecio cleistolepis Phil.
- Species Senecio clematoides Sch.Bip. ex A.Rich. accepted as Mikaniopsis clematoides (Sch.Bip. ex A.Rich.) Milne-Redh.
- Species Senecio clevelandii Greene accepted as Packera clevelandii (Greene) W.A.Weber & Á.Löve
- Species Senecio cliffordianus Hutch. accepted as Kleinia cliffordiana (Hutch.) C.D.Adams
- Species Senecio cliffordii N.D.Atwood & S.L.Welsh accepted as Packera spellenbergii (T.M.Barkley) C.Jeffrey
- Species Senecio clivicola Wedd.
- Species Senecio clivicolus Wedd.
- Species Senecio clivorum (Maxim.) Maxim. accepted as Ligularia dentata (A.Gray) Hara
- Species Senecio clusianus Rchb.f.
- Species Senecio clusii Sch.Bip.
- Species Senecio coahuilensis Greenm.
- Species Senecio cobanensis J.M.Coult.
- Species Senecio cobrensis Cuatrec.
- Species Senecio coccineiflorus G.D.Rowley accepted as Kleinia grantii (Oliv. & Hiern) Hook.f.
- Species Senecio coccineus Klatt
- Species Senecio coccineus (Oliv. & Hiern) H.Jacobsen
- Species Senecio coccineus (Oliv. & Hiern) Muschl. accepted as Kleinia grantii (Oliv. & Hiern) Hook.f.
- Species Senecio cochabambensis Cabrera
- Species Senecio cochlearifolius Bojer ex DC.
- Species Senecio cochlearis G.Simpson & J.S.Thomson accepted as Brachyglottis traversii (F.Muell.) B.Nord.
- Species Senecio cockaynei G.Simpson & J.S.Thomson accepted as Brachyglottis cockaynei (G.Simpson & J.S.Thomson) B.Nord.
- Species Senecio cocuyanus (Cuatrec.) Cuatrec.
- Species Senecio coferifer H.Lév. accepted as Sinosenecio bodinieri (Vaniot) B.Nord.
- Species Senecio cognatus Greene accepted as Packera streptanthifolia (Greene) W.A.Weber & Á.Löve
- Species Senecio coincyi Rouy accepted as Tephroseris coincyi (Rouy) Holub
- Species Senecio colaminus Cuatrec.
- Species Senecio colensoensis O.Hoffm.
- Species Senecio colensoensis O.Hoffm. ex Kuntze accepted as Senecio scoparius Harv.
- Species Senecio colensoi Hook.f. accepted as Senecio banksii Hook.f.
- Species Senecio coleophyllus Turcz.
- Species Senecio collinus DC.
- Species Senecio collinus A.Nelson
- Species Senecio collinus Nelson ex Greenm.
- Species Senecio colombianus (Cuatrec.) Cuatrec. accepted as Pentacalia colombiana (Cuatrec.) Cuatrec.
- Species Senecio coloniarius S.Moore accepted as Emilia coloniaria (S.Moore) C.Jeffrey
- Species Senecio colpodes Bong.
- Species Senecio colu-huapiensis Speg.
- Species Senecio columbaria J.Rémy accepted as Senecio calocephalus Poepp. & Endl.
- Species Senecio columbianus Greene accepted as Senecio integerrimus var. exaltatus (Nutt.) Cronquist
- Species Senecio columnae E.H.L.Krause
- Species Senecio comarapensis Cabrera accepted as Pentacalia comarapensis (Cabrera) Cuatrec.
- Species Senecio comberi Cabrera
- Species Senecio commersonii Spreng.
- Species Senecio commutatus F.Heller
- Species Senecio comosus Sch.Bip.
- Species Senecio compactus (A.Gray) Rydb.
- Species Senecio compactus (A.Gray) Rydb. ex Porter & Britton accepted as Packera tridenticulata (Rydb.) W.A.Weber & Á.Löve
- Species Senecio compactus Kirk accepted as Brachyglottis compacta (Kirk) B.Nord.
- Species Senecio compta Franch.
- Species Senecio conchilobus Engelm. ex Greenm.
- Species Senecio conchocladus Hort.
- Species Senecio concinnus Franch. accepted as Nemosenecio concinnus (Franch.) C.Jeffrey & Y.L.Chen
- Species Senecio concolor Cordem.
- Species Senecio concolor Harv.
- Species Senecio concolor DC. accepted as Senecio speciosus Willd.
- Species Senecio condensatus Greene
- Species Senecio condimentarius Cabrera
- Species Senecio condylus I.Thomps.
- Species Senecio conferruminatus I.Thomps.
- Species Senecio confertissimus Cabrera accepted as Senecio depressus Hook. & Arn.
- Species Senecio confertoides De Wild. accepted as Senecio transmarinus var. transmarinus
- Species Senecio confertus Sch.Bip. ex A.Rich.
- Species Senecio confertus Nelson ex Greenm.
- Species Senecio confertus A.Nelson
- Species Senecio conferviferus H.Lév.
- Species Senecio confusus Burtt
- Species Senecio confusus Britten accepted as Pseudogynoxys chenopodioides (Kunth) Cabrera
- Species Senecio confusus Elmer accepted as Senecio scandens Buch.-Ham. ex D.Don
- Species Senecio congestus (R.Br.) DC. accepted as Tephroseris palustris (L.) Rchb.
- Species Senecio congolensis De Wild. accepted as Solanecio mannii (Hook.f.) C.Jeffrey
- Species Senecio conipes Sommier & Levier accepted as Iranecio pandurifolius (K.Koch) C.Jeffrey
- Species Senecio connatus N.P.Balakr. accepted as Cremanthodium arnicoides (DC. ex Royle) R.D.Good
- Species Senecio conradii Muschl. accepted as Senecio milanjianus S.Moore
- Species Senecio conrathii N.E.Br.
- Species Senecio consanguineus DC.
- Species Senecio consanguineus Phil. accepted as Senecio tristis Phil.
- Species Senecio constanzae Urb.
- Species Senecio conterminus Greenm. accepted as Packera contermina (Greenm.) J.F.Bain
- Species Senecio contristatus Greene
- Species Senecio controversus F.Schultz ex Nyman
- Species Senecio convallium Greenm. accepted as Packera cana (Hook.) W.A.Weber & Á.Löve
- Species Senecio convolvuloides Greenm. accepted as Pseudogynoxys chenopodioides (Kunth) Cabrera
- Species Senecio conyzaefolius Baker
- Species Senecio conyzifolius Baker
- Species Senecio conyzoides DC.
- Species Senecio conzattii Greenm.
- Species Senecio cooperi Greenm. accepted as Jessea cooperi (Greenm.) H.Rob. & Cuatrec.
- Species Senecio copeyensis Greenm.
- Species Senecio copiapinus Phil. accepted as Senecio cachinalensis Phil.
- Species Senecio coquimbensis Phil.
- Species Senecio corazonensis Hieron. ex Sodiro
- Species Senecio corazonensis Hieron. accepted as Pentacalia corazonensis (Hieron.) Cuatrec.
- Species Senecio corcovadensis Cabrera
- Species Senecio cordato-rotundus Steud.
- Species Senecio cordatus W.D.J.Koch
- Species Senecio cordatus Wall.
- Species Senecio cordatus Nutt. accepted as Senecio integerrimus var. ochroleucus (A.Gray) Cronquist
- Species Senecio cordatus accepted as Jacobaea alpina (L.) Moench
- Species Senecio cordifolius L.f.
- Species Senecio cordifolius Link
- Species Senecio cordifolius (Gouan) Clairv. accepted as Jacobaea alpina (L.) Moench
- Species Senecio cordillerae Phil.
- Species Senecio cordovensis Hemsl. accepted as Roldana cordovensis (Hemsl.) H.Rob. & Brettell
- Species Senecio corei Cuatrec.
- Species Senecio coreopsoides Chiov. accepted as Senecio transmarinus var. sycephalus (S.Moore)
- Species Senecio coriaceisquamus C.C.Chang
- Species Senecio coriaceisquamus Chang
- Species Senecio coriaceus Ait.
- Species Senecio cornu-cervi MacOwan
- Species Senecio coroicensis Rusby accepted as Dendrophorbium coroicense (Rusby) C.Jeffrey
- Species Senecio coronatus (Thunb.) Harv.
- Species Senecio coronopifolius Burm.f.
- Species Senecio coronopifolius Willd. ex Ball
- Species Senecio coronopifolius Desf. accepted as Senecio glaucus subsp. coronopifolius (Maire) C.Alexander
- Species Senecio coronopodiphyllus J.Rémy
- Species Senecio coronopus Nutt. accepted as Senecio californicus DC.
- Species Senecio correvonianus Albov accepted as Dolichorrhiza correvoniana (Albov) Galushko
- Species Senecio corrugatus (Phil.) Pelser
- Species Senecio corsicus Sch.Bip.
- Species Senecio cortesianus Muschl. accepted as Senecio transmarinus var. sycephalus (S.Moore)
- Species Senecio cortusifolius Hand.-Mazz. accepted as Sinosenecio cortusifolius (Hand.-Mazz.) B.Nord.
- Species Senecio corymbiferus DC. accepted as Senecio sarcoides C.Jeffrey
- Species Senecio corymbosus Wall. ex DC.
- Species Senecio corymbosus (DC.) H.Jacobsen
- Species Senecio corymbosus Dalla Torre
- Species Senecio corymbosus Wall.
- Species Senecio corymbosus Benth. accepted as Pentacalia corymbosa (Benth.) Cuatrec.
- Species Senecio corymbosus C.B.Clarke accepted as Ligularia pachycarpa (C.B.Clarke ex Hook.f.) Kitam.
- Species Senecio coscayanus Ricardi & Martic.
- Species Senecio cosnipatense Cabrera accepted as Dendrophorbium cosnipatense (Cabrera) H.Beltrán
- Species Senecio cosnipatensis Cabrera
- Species Senecio costae Rouy
- Species Senecio costaricensis R.M.King
- Species Senecio cottonii Hutch. & G.Taylor accepted as Dendrosenecio kilimanjari subsp. cottonii (Hutch. & G.Taylor) E.B.Knox
- Species Senecio cotuloides Reiche accepted as Senecio zosterifolius Hook. & Arn.
- Species Senecio cotyledonis DC.
- Species Senecio coulteri Greenm.
- Species Senecio coursii Humbert accepted as Humbertacalia coursii (Humbert) C.Jeffrey
- Species Senecio covasii Cabrera
- Species Senecio covillei Greene accepted as Senecio scorzonella Greene
- Species Senecio covuncensis Cabrera
- Species Senecio coxi Phil.
- Species Senecio coxii Phil.
- Species Senecio coymolachensis Cabrera
- Species Senecio craibinnus Hosseus
- Species Senecio crambefolius Boiss. & Kotschy
- Species Senecio crassiandinus Montesinos & Pino
- Species Senecio crassicaulis Hutch.
- Species Senecio crassicaulis Brongn.
- Species Senecio crassiflorus (Poir.) DC.
- Species Senecio crassifolius Beck
- Species Senecio crassifolius Sibth. & Sm.
- Species Senecio crassifolius Willd. accepted as Senecio leucanthemifolius Poir.
- Species Senecio crassilodix Cuatrec.
- Species Senecio crassipes H.Lév. & Vaniot accepted as Gynura pseudochina (L.) DC.
- Species Senecio crassissima
- Species Senecio crassissimus Humbert
- Species Senecio crassiusculus DC.
- Species Senecio crassorhizus De Wild.
- Species Senecio crassulaefolius (DC.) Sch.Bip.
- Species Senecio crassulifolius Sch.Bip.
- Species Senecio crassulus A.Gray
- Species Senecio crassus H.Jacobsen
- Species Senecio crassus Vell. accepted as Erechtites valerianifolius (Link ex Wolf) Less. ex DC.
- Species Senecio crataegifolius Hayata accepted as Senecio scandens var. crataegifolius (Hayata) Kitam.
- Species Senecio crawfordii (Britton) G.W.Douglas & G. Ruyle-Douglas
- Species Senecio crawfordii Britton accepted as Packera paupercula (Michx.) Á.Löve & D.Löve
- Species Senecio cremeiflorus Mattf.
- Species Senecio cremnicola Cabrera
- Species Senecio cremnophilus I.M.Johnst.
- Species Senecio cremophilus Phil. accepted as Senecio xerophilus Phil.
- Species Senecio crenatus Thunb.
- Species Senecio crenulatus DC.
- Species Senecio crepidifolius DC.
- Species Senecio crepidiformis Hutch.
- Species Senecio crepidineus Greene accepted as Senecio elmeri Piper
- Species Senecio crepidioides Asch.
- Species Senecio crepidioides (Benth.) Aschers. accepted as Crassocephalum crepidioides (Benth.) S.Moore
- Species Senecio crepidoides Phil.
- Species Senecio crinitus Bertol. accepted as Jacobaea delphiniifolia (Vahl) Pelser & Veldkamp
- Species Senecio crispatipilosus C.Jeffrey
- Species Senecio crispatus DC. accepted as Tephroseris crispa (Jacq.) Rchb.
- Species Senecio crispus Thunb.
- Species Senecio crispus Phil. accepted as Senecio hirtus Cabrera
- Species Senecio crispus (Jacq.) Kitt. accepted as Tephroseris crispa (Jacq.) Rchb.
- Species Senecio cristatus Thunb.
- Species Senecio cristimontanus Hilliard
- Species Senecio cristobalensis Greenm. accepted as Roldana oaxacana (Hemsl.) H.Rob. & Brettell
- Species Senecio cristobalensis Greenm. ex Loes. accepted as Roldana cristobalensis (Greenm. ex Greenm.) H.Rob. & Brettell
- Species Senecio crithmifolius A.Rich.
- Species Senecio crithmifolius Scop.
- Species Senecio crithmoides Hook. & Arn.
- Species Senecio croaticus Waldst. & Kit.
- Species Senecio crocatus Rydb. accepted as Packera crocata (Rydb.) W.A.Weber & Á.Löve
- Species Senecio croceus DC.
- Species Senecio cronquistii (H.Rob. & Brettell) B.L.Turner & T.M.Barkley
- Species Senecio croussei Lem.
- Species Senecio crucaefolius Willk.
- Species Senecio cruciatus L.f.
- Species Senecio cruentus Roth
- Species Senecio cruentus (Masson ex L'Hér.) DC. accepted as Pericallis cruenta (L'Hér.) Bolle
- Species Senecio crusoei Pelser
- Species Senecio crymophilus Wedd. accepted as Pentacalia gelida (Wedd.) Cuatrec.
- Species Senecio cryophilus Schischk. & Serg.
- Species Senecio cryphiactis O.Hoffm.
- Species Senecio cryptocephalus Cabrera
- Species Senecio cryptocephalus Sch.Bip. ex Wedd.
- Species Senecio cryptolanatus Killick
- Species Senecio ctenophyllus Phil.
- Species Senecio ctenophyllus Greenm.
- Species Senecio cuatrecasasii Cabrera
- Species Senecio cubensis Greenm.
- Species Senecio cuchumatanensis L.O.Williams & Ant.Molina
- Species Senecio cucullatus Klatt accepted as Pentacalia caracasana (Klatt) Cuatrec.
- Species Senecio cuencanus Hieron.
- Species Senecio culciklattii Cuatrec.
- Species Senecio culciremyi Cuatrec. accepted as Senecio candidans DC.
- Species Senecio culcitenellus Cuatrec.
- Species Senecio culcitioides Sch.Bip. accepted as Senecio comosus var. culcitioides (Sch.Bip.) Cabrera
- Species Senecio culcitioides Sch.Bip. ex Wedd. accepted as Senecio comosus var. culcitioides (Sch.Bip.) Cabrera
- Species Senecio culcitium J.Rémy
- Species Senecio cumingii Hook. & Arn.
- Species Senecio cumingii Klatt
- Species Senecio cuneatus Hook.f.
- Species Senecio cuneifolius Gardner accepted as Graphistylis cuneifolia (Gardner) B.Nord.
- Species Senecio cuneifolius (L.) Sch.Bip. accepted as Othonna arborescens L.
- Species Senecio cunninghamii DC.
- Species Senecio cupulatus Volkens & Muschl. accepted as Senecio macroglossus DC.
- Species Senecio curtophyllus (Klatt) Klatt accepted as Senecio tysonii MacOwan
- Species Senecio curvatus Baker
- Species Senecio curvidens Sch.Bip. accepted as Dendrophorbium curvidens (Sch.Bip. ex Klatt) C.Jeffrey
- Species Senecio curvidens Sch.Bip. ex Klatt accepted as Dendrophorbium curvidens (Sch.Bip. ex Klatt) C.Jeffrey
- Species Senecio curvisquamus (Hand.-Mazz.) Chang accepted as Ligularia curvisquama Hand.-Mazz.
- Species Senecio cuspidatus DC. accepted as Senecio montevidensis (Spreng.) Baker
- Species Senecio cuzcoensis Cabrera accepted as Pentacalia oronocensis (DC.) Cuatrec.
- Species Senecio cyaneus O.Hoffm.
- Species Senecio cyclaminifolius Franch. accepted as Sinosenecio cyclaminifolius (Franch.) B.Nord.
- Species Senecio cyclocladus Baker accepted as Senecio canaliculatus Bojer ex DC.
- Species Senecio cyclophyllus Greenm. accepted as Packera coahuilensis (Greenm.) C.Jeffrey
- Species Senecio cyclotus Bureau & Franch. accepted as Parasenecio cyclotus (Bureau & Franch.) Y.L.Chen
- Species Senecio cydoniifolius Steud.
- Species Senecio cydoniifolius O.Hoffm. ex Engl.
- Species Senecio cydoniifolius O.Hoffm. accepted as Solanecio cydoniifolius (O.Hoffm.) C.Jeffrey
- Species Senecio cygnorum Steetz
- Species Senecio cylindricus (A.Berger) H.Jacobsen
- Species Senecio cylindrocephalus Cabrera
- Species Senecio cymatocrepis Diels accepted as Synotis alata (Wall. ex DC.) C.Jeffrey & Y.L.Chen
- Species Senecio cymbalaria Pursh accepted as Packera cymbalaria (Pursh) W.A.Weber & Á.Löve
- Species Senecio cymbalariifolius (Thunb.) Less. accepted as Senecio hastifolius Less.
- Species Senecio cymbalarioides Nutt. accepted as Packera streptanthifolia (Greene) W.A.Weber & Á.Löve
- Species Senecio cymbalarioides H.Buek accepted as Packera subnuda (DC.) Trock & T.M.Barkley
- Species Senecio cymbulifer W.W.Sm. accepted as Ligularia cymbulifera (W.W.Sm.) Hand.-Mazz.
- Species Senecio cymosa (ex Gay) J.Rémy
- Species Senecio cymosus J.Rémy
- Species Senecio cynthioides Greene accepted as Packera cynthioides (Greene) W.A.Weber & Á.Löve
- Species Senecio cypriaefolius Steud.
- Species Senecio cyrenaicus (E.A.Durand & Barratte) Pamp. accepted as Senecio leucanthemifolius subsp. cyrenaicus (E.A.Durand & Barratte) Greuter
- Species Senecio cyri K.Koch
- Species Senecio czernjaevii Minderova accepted as Tephroseris integrifolia (L.) Holub
- Species Senecio dacicus Hodálová & Marhold accepted as Senecio hercynicus subsp. dacicus (Hodálová & Marhold) Greuter
- Species Senecio dahuricus Sch.Bip.
- Species Senecio dahuricus Fisch. ex Turcz.
- Species Senecio dalei Cotton & Blakelock accepted as Dendrosenecio cheranganiensis subsp. dalei (Cotton & Blakelock) E.B.Knox
- Species Senecio dalmaticus Vis.
- Species Senecio daltonii F.Muell.
- Species Senecio dalzellii C.B.Clarke
- Species Senecio danai A.Gray
- Species Senecio danal A.Gray
- Species Senecio danielis Cuatrec. accepted as Pentacalia danielis (Cuatrec.) Cuatrec.
- Species Senecio danubialis Gand.
- Species Senecio danyausii Hombr. & Jacquinot ex Decne.
- Species Senecio danyausii Hombr. & Jacq. accepted as Senecio patagonicus Hook. & Arn.
- Species Senecio daochengensis Y.L.Chen
- Species Senecio daphnoides Poir.
- Species Senecio darwinii Hook. & Arn.
- Species Senecio dasyanthus Phil.
- Species Senecio dasyphyllus (Gand.) Cuatrec. accepted as Senecio vaginifolius Sch.Bip.
- Species Senecio davidi Franch.
- Species Senecio davidii Franch. accepted as Sinacalia davidii (Franch.) H.Koyama
- Species Senecio davilae Phil.
- Species Senecio davisii V.A.Matthews
- Species Senecio davisii Matthews accepted as Iranecio davisii (V.A.Matthews) C.Jeffrey
- Species Senecio davuricus Franch. & Sav.
- Species Senecio dawsonii Greenm.
- Species Senecio dealbatus Phil.
- Species Senecio deaniensis Muschl. accepted as Senecio meyeri-johannis Engl.
- Species Senecio deasyi Hemsl.
- Species Senecio debilis Nutt. accepted as Packera debilis (Nutt.) W.A.Weber & Á.Löve
- Species Senecio debilis Harv. accepted as Senecio infirmus C.Jeffrey
- Species Senecio debilis Phil. accepted as Senecio invalidus C.Jeffrey
- Species Senecio decaisnei DC. accepted as Senecio flavus (Decne.) Sch.Bip.
- Species Senecio decaryi Humbert
- Species Senecio decipiens Herborg
- Species Senecio decipiens Nyár.
- Species Senecio decipiens Benoist accepted as Senecio betonicifolius DC.
- Species Senecio decolor Benoist accepted as Senecio senecioides (Kunth) Kuntze
- Species Senecio decompositus Sch.Bip. ex Hieron.
- Species Senecio decorticans A.Nelson accepted as Senecio lemmonii A.Gray
- Species Senecio decorus Greenm. accepted as Senecio callosus Sch.Bip.
- Species Senecio decurrens DC.
- Species Senecio deferens Griseb.
- Species Senecio deflersii O.Schwartz
- Species Senecio deformis Klatt
- Species Senecio degiensis Pic.Serm. accepted as Senecio farinaceus Sch.Bip. ex A.Rich.
- Species Senecio dekindtianus Volkens & O.Hoffm. accepted as Senecio pachyrhizus O.Hoffm.
- Species Senecio delavayi Franch. accepted as Senecio nigrocinctus Franch.
- Species Senecio delbesianus Arènes
- Species Senecio delessertii Sch.Bip.
- Species Senecio delfinii Phil. accepted as Senecio molinae Phil.
- Species Senecio delicatulus Cabrera & Zardini
- Species Senecio deliculatus Cabrera & Zardini
- Species Senecio delphinifolius Rchb.
- Species Senecio delphiniifolius Vahl accepted as Jacobaea delphiniifolia (Vahl) Pelser & Veldkamp
- Species Senecio delphiniphyllus H.Lév. accepted as Parasenecio delphiniphyllus (H.Lév.) Y.L.Chen
- Species Senecio deltoideus Less.
- Species Senecio deltophyllus Maxim. accepted as Parasenecio deltophyllus (Maxim.) Y.L.Chen
- Species Senecio delubrorum Heldr.
- Species Senecio demissus Phil. accepted as Senecio trifidus Hook. & Arn.
- Species Senecio denalii A.Nelson
- Species Senecio denisii Humbert
- Species Senecio densiflorus Wall.
- Species Senecio densiflorus M.Martens accepted as Packera glabella (Poir.) C.Jeffrey
- Species Senecio densiflorus Wall. ex DC. accepted as Senecio cappa Buch.-Ham. ex D.Don
- Species Senecio densiserratus C.C.Chang
- Species Senecio densiserratus Chang
- Species Senecio densus Greene accepted as Packera tridenticulata (Rydb.) W.A.Weber & Á.Löve
- Species Senecio dentato-alatus Mildbr. ex C.Jeffrey
- Species Senecio dentatus Jacq.
- Species Senecio dentatus Wall.
- Species Senecio denticulatus (Hook. & Arn.) DC.
- Species Senecio denticulatus Hook. & Arn.
- Species Senecio denticulatus (Thunb.) Fourc.
- Species Senecio denticulatus Engl. accepted as Senecio subsessilis Oliv. & Hiern
- Species Senecio denticulatus O.F.Müll. accepted as Senecio vulgaris subsp. denticulatus (O.F.Müll.) P.D.Sell
- Species Senecio denudatus D.Don
- Species Senecio depauperatus Mattf.
- Species Senecio depilis Phil.
- Species Senecio deppeanus Hemsl.
- Species Senecio depressicola I.Thomps.
- Species Senecio depressus Hook. & Arn.
- Species Senecio depressus Hauman accepted as Senecio lorentziella Hicken
- Species Senecio dernburgianus Muschl. accepted as Senecio subsessilis Oliv. & Hiern
- Species Senecio descoingsii (Humbert) jacobs. ex G.D.Rowley
- Species Senecio descoingsii (Humbert) H.Jacobsen
- Species Senecio descoingsii (C.Jeffrey) G.D.Rowley
- Species Senecio deserticola Cabrera accepted as Senecio xerophilus Phil.
- Species Senecio desertorum Hemsl. accepted as Roldana angulifolia (DC.) H.Rob. & Brettell
- Species Senecio desfontainei Druce accepted as Senecio glaucus subsp. coronopifolius (Maire) C.Alexander
- Species Senecio desiderabilis Vell.
- Species Senecio desideratus DC.
- Species Senecio desideratus Baker
- Species Senecio desmatus Klatt accepted as Senecio hypargyraeus DC.
- Species Senecio desquamatus Willd.
- Species Senecio dewevrei O.Hoffm. ex T.Durand & De Wild. accepted as Solanecio cydoniifolius (O.Hoffm.) C.Jeffrey
- Species Senecio dewildemanianus Muschl. accepted as Senecio transmarinus var. major C.Jeffrey
- Species Senecio dewildeorum Tjitr.
- Species Senecio diabolicus Speg.
- Species Senecio diaguita Cabrera
- Species Senecio diamantensis Cuatrec.
- Species Senecio dianthus Franch. accepted as Synotis erythropappa (Bureau & Franch.) C.Jeffrey & Y.L.Chen
- Species Senecio diaschides D.G.Drury
- Species Senecio diazii Phil. accepted as Senecio crithmoides Hook. & Arn.
- Species Senecio dichotomus Phil.
- Species Senecio dichrous Bong.
- Species Senecio dichrous (Bong.) Sch.Bip. accepted as Graphistylis dichroa (Bong.) D.J.N.Hind
- Species Senecio diclinus Wedd. accepted as Chersodoma antennaria (Wedd.) Cabrera
- Species Senecio dictionurus Franch. accepted as Ligularia dictyoneura (Franch.) Hand.-Mazz.
- Species Senecio dictyophlebius Greenm. accepted as Pentacalia dictyophlebia (Greenm.) Cuatrec.
- Species Senecio dictyophyllus Benth. accepted as Roldana reticulata (DC.) H.Rob. & Brettell
- Species Senecio didymantha Dunn accepted as Sinacalia davidii (Franch.) H.Koyama
- Species Senecio dielsii Muschl.
- Species Senecio dielsii H.Lév. accepted as Cremanthodium coriaceum S.W.Liu
- Species Senecio dielsii Domke accepted as Dendrophorbium dielsii C.Jeffrey
- Species Senecio diemii Cabrera
- Species Senecio dieterlenii E.Phillips accepted as Senecio rhomboideus Harv.
- Species Senecio difficilis Dufour accepted as Senecio gallicus Vill.
- Species Senecio diffusus Thunb.
- Species Senecio diffusus L.f.
- Species Senecio diffusus Greenm.
- Species Senecio digitalifolius DC.
- Species Senecio digitatus Phil.
- Species Senecio dileptiifolius Greene
- Species Senecio dilungensis Lisowski
- Species Senecio dimorphocarpos Colenso
- Species Senecio dimorphophyllus Greene accepted as Packera dimorphophylla (Greene) W.A.Weber & Á.Löve
- Species Senecio dindondl P.Royen accepted as Papuacalia dindondl (P.Royen) Veldkamp
- Species Senecio dinteri Muschl. ex Dinter accepted as Emilia ambifaria (S.Moore) C.Jeffrey
- Species Senecio diodon DC.
- Species Senecio diosmoides Turcz. accepted as Pentacalia peruviana (Pers.) Cuatrec.
- Species Senecio diphyllus De Wild. & Muschl.
- Species Senecio diplostephioides Cuatrec. accepted as Pentacalia diplostephioides (Cuatrec.) Cuatrec.
- Species Senecio discifolius Oliv. accepted as Emilia discifolia (Oliv.) C.Jeffrey
- Species Senecio disciformis Hieron. ex Sodiro
- Species Senecio disciformis Hieron. accepted as Pentacalia disciformis (Hieron.) Cuatrec.
- Species Senecio discodregeanus Hilliard & B.L.Burtt
- Species Senecio discoideus (Hook.) Britton accepted as Packera pauciflora (Pursh) Á.Löve & D.Löve
- Species Senecio discoideus (Maxim.) Franch. accepted as Cremanthodium discoideum Maxim.
- Species Senecio discoideus (V.A.Matthews) Yıld.
- Species Senecio discokaraguensis C.Jeffrey
- Species Senecio discolor Desf.
- Species Senecio discolor (Sw.) Bojer ex DC.
- Species Senecio discoloratus Cuatrec.
- Species Senecio disjectus Wedd.
- Species Senecio disjunctus Flatscher, Schneew. & Schönsw.
- Species Senecio dispar A.Nelson accepted as Senecio integerrimus var. exaltatus (Nutt.) Cronquist
- Species Senecio disparifolius Cabrera accepted as Senecio subulatus var. subulatus
- Species Senecio dissidens Fourc.
- Species Senecio dissimulans Hilliard
- Species Senecio dissimulans Hilliard & B.L.Burtt
- Species Senecio distalilobatus I.Thomps.
- Species Senecio distinctus Colenso accepted as Brachyglottis perdicioides var. distincta B.Nord.
- Species Senecio divaricatus Andrz. accepted as Jacobaea borysthenica (DC.) B.Nord. & Greuter
- Species Senecio divaricatus L. accepted as Gynura divaricata (L.) DC.
- Species Senecio divaricoides Cabrera
- Species Senecio divergens F.Schultz ex Nyman
- Species Senecio diversidentatus Muschl. accepted as Senecio inornatus DC.
- Species Senecio diversifolius Harv.
- Species Senecio diversifolius Dumort.
- Species Senecio diversifolius Wall.
- Species Senecio diversifolius Wall. ex DC. accepted as Senecio raphanifolius Wall. ex DC.
- Species Senecio diversifolius A.Rich. accepted as Crassocephalum crepidioides (Benth.) S.Moore
- Species Senecio diversifolius Phil. accepted as Senecio subulatus var. subulatus
- Species Senecio diversipinnus Ling
- Species Senecio divisorius Cabrera accepted as Pentacalia divisoria (Cabrera) Cuatrec.
- Species Senecio dodrans C.Winkl.
- Species Senecio doeringii Hieron.
- Species Senecio dolichanthus (Krug & Urb.) S.Moore
- Species Senecio dolichocephalus I.Thomps.
- Species Senecio dolichodoryius Cuatrec.
- Species Senecio dolichopappus O.Hoffm. accepted as Lopholaena dolichopappa (O.Hoffm.) S.Moore
- Species Senecio dombeyanus DC.
- Species Senecio domeykoanus Phil. accepted as Senecio pachyphyllos J.Rémy
- Species Senecio domingensis Urb.
- Species Senecio dominii Hodálová
- Species Senecio donae-anae Phil. accepted as Senecio volckmannii Phil.
- Species Senecio don-candidus Cuatrec.
- Species Senecio donianus Hook. & Arn.
- Species Senecio donnae Phil.
- Species Senecio donnell-smithii J.M.Coult. accepted as Roldana barba-johannis (DC.) H.Rob. & Brettell
- Species Senecio doratophyllus Benth.
- Species Senecio doria K.Koch
- Species Senecio doria L.
- Species Senecio doria Kickx
- Species Senecio doriiformis DC.
- Species Senecio doriiformis DC.
- Species Senecio doroniciflorus DC. accepted as Senecio albanensis var. doroniciflorus (DC.) Harv.
- Species Senecio doroniciflorus (DC.) Hook. & Arn. accepted as Senecio selloi (Spreng.) DC.
- Species Senecio doronicum (L.) L.
- Species Senecio doronicum Willk.
- Species Senecio doryotus Hand.-Mazz. accepted as Sinosenecio euosmus (Hand.-Mazz.) B.Nord.
- Species Senecio doryphoroides C.Jeffrey
- Species Senecio doryphorus Mattf.
- Species Senecio doryphyllus Cuatrec.
- Species Senecio douglasii (ex de Candolle) DC. accepted as Senecio flaccidus var. douglasii (DC.) B.L.Turner & T.M.Barkley
- Species Senecio dracunculoides DC. accepted as Senecio burchellii DC.
- Species Senecio drakensbergis (Klatt) Klatt accepted as Senecio sandersonii Harv.
- Species Senecio dregeanus DC.
- Species Senecio drepanophyllus Klatt accepted as Senecio emirnensis subsp. angavonensis (Bojer ex DC.) Humbert
- Species Senecio drukensis C.Marquand & Airy Shaw
- Species Senecio drummondii Babu & S.N.Biswas accepted as Senecio thianschanicus Regel & Schmalh.
- Species Senecio dryadeus Ewart
- Species Senecio dryadeus Sieber ex DC.
- Species Senecio dryadeus Sieber ex Spreng. accepted as Senecio garlandii F.Muell. ex Belcher
- Species Senecio dryas Dunn accepted as Sinosenecio dryas (Dunn) C.Jeffrey & Y.L.Chen
- Species Senecio drymophilus F.Muell.
- Species Senecio dryophyllus Meyen & Walp.
- Species Senecio dubitabilis C.Jeffrey & Y.L.Chen
- Species Senecio dubius Hook.f. & Thomson ex Hook.f.
- Species Senecio dubius Sch.Bip.
- Species Senecio dubius Beck
- Species Senecio dubius Ledeb. accepted as Senecio dubitabilis C.Jeffrey & Y.L.Chen
- Species Senecio duciformis C.Winkl. accepted as Ligularia duciformis (C.Winkl.) Hand.-Mazz.
- Species Senecio ducis-aprutii Chiov. accepted as Crassocephalum ducis-aprutii (Chiov.) S.Moore
- Species Senecio duclouxii Dunn accepted as Synotis duclouxii (Dunn) C.Jeffrey & Y.L.Chen
- Species Senecio ductoris Piper accepted as Senecio fremontii Torr. & A.Gray
- Species Senecio dumeticola S.Moore
- Species Senecio dumeticolus S.Moore
- Species Senecio dumetorum Gardner
- Species Senecio dumosus Fourc.
- Species Senecio dumosus Phil. accepted as Senecio tricuspidatus Hook. & Arn.
- Species Senecio dunedinensis Belcher
- Species Senecio dunensis Dumort. accepted as Jacobaea vulgaris subsp. dunensis (Dumort.) Pelser & Meijden
- Species Senecio durandii Klatt ex T.Durand & Pitt.
- Species Senecio durandii Klatt accepted as Charadranaetes durandii (Klatt) Janovec & H.Rob.
- Species Senecio durangensis Greenm.
- Species Senecio durbanensis Gand. accepted as Senecio deltoideus Less.
- Species Senecio duriaei J.Gay
- Species Senecio duriaei Gay & Gay
- Species Senecio dusenii O.Hoffm. ex Dusén
- Species Senecio dusenii O.Hoffm.
- Species Senecio dusenii O.Hoffm. ex O.Hoffm. accepted as Senecio cuneatus Hook.f.
- Species Senecio duthiei M.A.Rau accepted as Parasenecio quinquelobus var. quinquelobus
- Species Senecio dux C.B.Clarke accepted as Ligularia dux (C.B.Clarke) Ling
- Species Senecio earlei Small accepted as Packera anonyma W.A.Weber & Á.Löve
- Species Senecio eboracensis R.J.Abbott & A.J.Lowe
- Species Senecio ecalyculatus Sch.Bip.
- Species Senecio echaetus Y.L.Chen & K.Y.Pan
- Species Senecio echinatus (L.f.) DC. accepted as Pericallis echinata (L.f.) B.Nord.
- Species Senecio ecklonianus DC. accepted as Senecio spiraeifolius Thunb.
- Species Senecio ecklonis Schönland
- Species Senecio ecuadorensis Hieron.
- Species Senecio ecuadorensis Klatt accepted as Pseudogynoxys sonchoides (Kunth) Cuatrec.
- Species Senecio ecuadoriensis Hieron. accepted as Pentacalia myrsinites (Turcz.) Cuatrec.
- Species Senecio edgeworthii Hook.f.
- Species Senecio eenii (S.Moore) Merxm.
- Species Senecio effusus Mattf. accepted as Crassocephalum effusum (Mattf.) C.Jeffrey
- Species Senecio eggersii Hieron. accepted as Pseudogynoxys scabra (Benth.) Cuatrec.
- Species Senecio ehrenbergianus Klatt accepted as Roldana ehrenbergiana (Klatt) H.Rob. & Brettell
- Species Senecio eightsii Hook. & Arn.
- Species Senecio eightsii (Hook.f.) Cabrera
- Species Senecio ekmanii Alain
- Species Senecio elaeagnifolius Hook.f. accepted as Brachyglottis elaeagnifolia (Hook.f.) B.Nord.
- Species Senecio elamutensis Franch.
- Species Senecio elatior Steud.
- Species Senecio elatoides Wedd.
- Species Senecio elatus Kunth accepted as Senecio usgorensis Cuatrec.
- Species Senecio elbrusensis Boiss.
- Species Senecio elegans L.
- Species Senecio elegans Thunb. accepted as Senecio arenarius Thunb.
- Species Senecio elegans Willd. accepted as Senecio elegans L.
- Species Senecio elgonensis Mattf. accepted as Senecio snowdenii Hutch.
- Species Senecio elgonensis T.C.E.Fr. accepted as Dendrosenecio elgonensis subsp. elgonensis
- Species Senecio eligulatus B.Nord., Moussavi & Djavadi
- Species Senecio eliseae J.Calvo
- Species Senecio ellenbeckii O.Hoffm.
- Species Senecio ellenbergii Cuatrec.
- Species Senecio elliotii S.Moore accepted as Senecio syringifolius O.Hoffm.
- Species Senecio elliottii Torr. & A.Gray accepted as Packera obovata (Muhl. ex Willd.) W.A.Weber & Á.Löve
- Species Senecio ellipticifolius Hieron. accepted as Pentacalia ellipticifolia (Hieron.) Cuatrec.
- Species Senecio ellipticus DC. accepted as Senecio desiderabilis Vell.
- Species Senecio ellsworthii Cuatrec. accepted as Arbelaezaster ellsworthii (Cuatrec.) Cuatrec.
- Species Senecio elmeri Piper
- Species Senecio elodes Boiss.
- Species Senecio elodes Boiss. ex DC. accepted as Tephroseris elodes (DC.) Holub
- Species Senecio elongatus Druce
- Species Senecio elongatus Pursh accepted as Packera obovata (Muhl. ex Willd.) W.A.Weber & Á.Löve
- Species Senecio elquiensis Cabrera
- Species Senecio elskensii De Wild. accepted as Solanecio cydoniifolius (O.Hoffm.) C.Jeffrey
- Species Senecio emilioides Baker
- Species Senecio emilioides Sch.Bip. accepted as Emilia emilioides (Sch.Bip.) C.Jeffrey
- Species Senecio emiliopsis C.Jeffrey
- Species Senecio eminens Compton
- Species Senecio emirnensis DC.
- Species Senecio emmae Cabrera
- Species Senecio emodensis Sch.Bip.
- Species Senecio empetroides Cuatrec. accepted as Pentacalia empetroides (Cuatrec.) Cuatrec.
- Species Senecio encelia Greene accepted as Packera neomexicana var. neomexicana (A.Gray) W.A.Weber & Á.Löve
- Species Senecio encelia J.Rémy accepted as Senecio linariifolius Poepp. ex DC.
- Species Senecio endlicheri DC.
- Species Senecio engleranus O.Hoffm.
- Species Senecio engleri Hieron. accepted as Pseudogynoxys engleri (Hieron.) H.Rob. & Cuatrec.
- Species Senecio epidendricus Mattf. accepted as Solanecio epidendricus (Mattf.) C.Jeffrey
- Species Senecio epidendrus L.O.Williams accepted as Pentacalia epidendra (L.O.Williams) H.Rob. & Cuatrec.
- Species Senecio epiphyticus Kuntze
- Species Senecio erechthithoides F.Muell. accepted as Senecio papuanus (Lauterb.) Belcher
- Species Senecio erechthitoides Lauterb.
- Species Senecio erechthitoides Baker
- Species Senecio erechtitioides Baker
- Species Senecio eremicola I.Thomps.
- Species Senecio eremophilus A.Gray
- Species Senecio eremophilus Richardson
- Species Senecio eremophilus Phil.
- Species Senecio ericaefolius Benth. accepted as Pentacalia peruviana (Pers.) Cuatrec.
- Species Senecio ericifolius Benth.
- Species Senecio erici-rosenii R.E.Fr. & T.C.E.Fr. accepted as Dendrosenecio erici-rosenii subsp. erici-rosenii (R.E.Fr. & T.C.E.Fr.) E.B.Knox
- Species Senecio ericoides Reiche accepted as Senecio miser Hook.f.
- Species Senecio ericuides Reiche
- Species Senecio erigeroides Dusén
- Species Senecio eriobasis DC.
- Species Senecio eriocarphus Greenm.
- Species Senecio eriocephalus Klatt
- Species Senecio eriocephalus klati ex T.Durand & Pitt.
- Species Senecio eriocladus Wedd.
- Species Senecio erioneuron Cotton accepted as Dendrosenecio adnivalis var. adnivalis
- Species Senecio eriophyllus Greenm. accepted as Roldana eriophylla (Greenm.) H.Rob. & Brettell
- Species Senecio eriophyton J.Rémy
- Species Senecio eriopodus Klatt
- Species Senecio eriopodus Cummins accepted as Sinosenecio eriopodus (Cumm.) C.Jeffrey & Y.L.Chen
- Species Senecio eriopus Willk.
- Species Senecio eriospermus DC. accepted as Iranecio eriospermus (DC.) C.Jeffrey
- Species Senecio erisithalifolius Sch.Bip. ex Baker
- Species Senecio erisithalifolius Sch.Bip.
- Species Senecio erlangeri O.Hoffm.
- Species Senecio erodiifolius DC.
- Species Senecio erosus L.f.
- Species Senecio erosus Wedd. accepted as Senecio rhizomatus Rusby
- Species Senecio erraticus Willk.
- Species Senecio erraticus Bertol. accepted as Jacobaea erratica (Bertol.) Fourr.
- Species Senecio ertterae T.M.Barkley
- Species Senecio erubescens Aiton
- Species Senecio erubescens Ait.
- Species Senecio erubescens Pančić accepted as Jacobaea arnautorum (Velen.) Pelser
- Species Senecio erucifolius Ledeb.
- Species Senecio erucifolius Kunze
- Species Senecio erucifolius L. accepted as Jacobaea erucifolia (L.) P.Gaertn., B.Mey. & Schreb.
- Species Senecio eruciformis J.Rémy
- Species Senecio ervendbergii Greenm. accepted as Packera tampicana (DC.) C.Jeffrey
- Species Senecio erysimoides DC.
- Species Senecio erythropappus Bureau & Franch.
- Species Senecio erythrophyllus Lázaro Ibiza
- Species Senecio esleri C.J.Webb
- Species Senecio esperensis (Sykes) de Lange
- Species Senecio espinosae Cabrera
- Species Senecio espiritosantensis A.M.Teles
- Species Senecio esquirolii Levl. accepted as Senecio nudicaulis Buch.-Ham. ex D.Don
- Species Senecio esquirolii H.Lév. accepted as Senecio nudicaulis Buch.-Ham. ex D.Don
- Species Senecio ettoreus Thunb.
- Species Senecio eubaeus Boiss. & Heldr.
- Species Senecio euclaensis I.Thomps.
- Species Senecio eudorus DC.
- Species Senecio euosmus Hand.-Mazz. accepted as Sinosenecio euosmus (Hand.-Mazz.) B.Nord.
- Species Senecio eupapposus (Cufod.) G.D.Rowley accepted as Kleinia squarrosa Cufod.
- Species Senecio eupatorioides Sch.Bip.
- Species Senecio eurycephalus Torr. & A.Gray accepted as Packera eurycephala (Torr. & A.Gray ex Torr. & A.Gray) W.A.Weber & Á.L
- Species Senecio eurycephalus Torr. & A.Gray ex A.Gray accepted as Packera eurycephala var. eurycephala (Torr. & A.Gray ex A.Gray) W.A.Weber & Á.Löve
- Species Senecio euryopoides DC.
- Species Senecio euryphyllus C.Winkl. accepted as Ligularia euryphylla (C.Winkl.) Hand.-Mazz.
- Species Senecio eurypterus Greenm. accepted as Packera neomexicana var. neomexicana (A.Gray) W.A.Weber & Á.Löve
- Species Senecio euxinus Minderova accepted as Senecio leucanthemifolius subsp. vernalis (Waldst. & Kit.) Greuter
- Species Senecio evacoides Sch.Bip.
- Species Senecio evacoides Sch.Bip. ex Wedd.
- Species Senecio evansianus Belcher
- Species Senecio evansii N.E.Br. accepted as Heteromma decurrens (DC.) O.Hoffm.
- Species Senecio evelynae Muschl.
- Species Senecio evenius (Phil.) Pelser
- Species Senecio everettii Hemsl.
- Species Senecio eversii Huter
- Species Senecio eversii Huter ex Murr
- Species Senecio exaltatus Nutt. accepted as Senecio integerrimus var. exaltatus (Nutt.) Cronquist
- Species Senecio exarachnoideus C.Jeffrey
- Species Senecio exilis homb. & Jacquinot ex Decne.
- Species Senecio exilis Hombr. & Jacquinot accepted as Senecio patagonicus Hook. & Arn.
- Species Senecio exilis C.I.Blanche ex Boiss. accepted as Senecio blanchei Soldano
- Species Senecio eximius Hemsl.
- Species Senecio expansus Wedd.
- Species Senecio expansus Harv. accepted as Senecio anapetes C.Jeffrey
- Species Senecio exsertiflorus Baker accepted as Senecio syringifolius O.Hoffm.
- Species Senecio exsertus Sch.Bip. accepted as Humbertacalia racemosa (DC.) C.Jeffrey
- Species Senecio exsquameus Brot. accepted as Senecio gallicus Vill.
- Species Senecio extensus I.Thomps.
- Species Senecio exuberans R.A.Dyer
- Species Senecio exul Hance
- Species Senecio faberi Hemsl.
- Species Senecio faberi Hemsl. ex Forb. & Hemsl.
- Species Senecio fabrisii Cabrera
- Species Senecio fadyenii Griseb. accepted as Odontocline fadyenii (Griseb.) B.Nord.
- Species Senecio falklandicus Hook.f. accepted as Senecio littoralis Gaudich.
- Species Senecio fallax Mattf. accepted as Emilia fallax (Mattf.) C.Jeffrey
- Species Senecio famatinensis Cabrera
- Species Senecio farfaraefolius (Sieb. & Zucc.)
- Species Senecio farfarifolius Maxim.
- Species Senecio farfarifolius Boiss. & Kotschy accepted as Iranecio bulghardaghensis (Soldano) D.Heller
- Species Senecio farfarifolius (Siebold & Zucc.) Sch.Bip. ex K.Koch accepted as Koyamacalia farfarifolia (Siebold & Zucc.) H.Rob. & Brettell
- Species Senecio farfarus Hemsl.
- Species Senecio farfugium K.Koch
- Species Senecio fargesii Franch. accepted as Ligularia fargesii (Franch.) Diels
- Species Senecio farinaceus Sch.Bip. ex A.Rich.
- Species Senecio farinifer Hook. & Arn.
- Species Senecio farkharensis Podlech accepted as Senecio franchetii C.Winkl.
- Species Senecio farriae Greenm.
- Species Senecio farrisii Baker
- Species Senecio fasciculatus Phil.
- Species Senecio fasciculatus Wall. ex DC.
- Species Senecio fasciculatus Hook. & Arn.
- Species Senecio fastigiaticephalus Cabrera accepted as Dendrophorbium fastigiaticephalum (Cabrera) C.Jeffrey
- Species Senecio fastigiatus Schwein. ex Elliott
- Species Senecio fastigiatus A.Gray
- Species Senecio fastigiatus Nutt. accepted as Packera macounii (Greene) W.A.Weber & Á.Löve
- Species Senecio faujasioides Baker
- Species Senecio fauriae Franch.
- Species Senecio fauriae Dunn accepted as Ligularia tsangchanensis (Franch.) Hand.-Mazz.
- Species Senecio fauriei H.Lév.
- Species Senecio fauriei accepted as Tephroseris kirilowii (Turcz. ex DC.) Holub
- Species Senecio fauriei Franch. accepted as Ligularia fauriei (Franch.) Koidz.
- Species Senecio favillosus Cuatrec. accepted as Pentacalia favillosa (Cuatrec.) Cuatrec.
- Species Senecio fayei Gand.
- Species Senecio featherstonei Cuatrec.
- Species Senecio feddei H.Lév. accepted as Ligularia hookeri (C.B.Clarke) Hand.-Mazz.
- Species Senecio fedifolius Rydb. accepted as Packera debilis (Nutt.) W.A.Weber & Á.Löve
- Species Senecio fedorovianus Schischk.
- Species Senecio fendleri A.Gray accepted as Packera fendleri (A.Gray) W.A.Weber & Á.Löve
- Species Senecio ferganensis Schischk. accepted as Jacobaea ferganensis (Schischk.) B.Nord. & Greuter
- Species Senecio fernaldii Greenm. accepted as Packera cymbalaria (Pursh) W.A.Weber & Á.Löve
- Species Senecio fernandezii Phil. accepted as Senecio molinae Phil.
- Species Senecio ferreyrae Cabrera
- Species Senecio ferrugineus (Klatt) Cuatrec.
- Species Senecio ferruglii Cabrera
- Species Senecio ferulifolius Stokes
- Species Senecio festucoides J.Calvo & A.Moreira
- Species Senecio feuillei Phil. accepted as Senecio gilliesianus Hieron.
- Species Senecio fibrillosus Dunn accepted as Ligularia subspicata (Bureau & Franch.) Hand.-Mazz.
- Species Senecio fibrosus O.Hoffm.
- Species Senecio fibrosus O.Hoffm. ex Kuntze accepted as Senecio albanensis var. doroniciflorus (DC.) Harv.
- Species Senecio ficariifolius H.Lév. & Vaniot accepted as Ligularia hookeri (C.B.Clarke) Hand.-Mazz.
- Species Senecio ficoides (L.) Sch.Bip. accepted as Kleinia ficoides (L.) Haw.
- Species Senecio fiebrigianus Cabrera accepted as Senecio clivicolus var. clivicolus
- Species Senecio filaginoides DC.
- Species Senecio filaris McVaugh
- Species Senecio filicalyculatus Cuatrec. accepted as Pseudogynoxys filicalyculata (Cuatrec.) Cuatrec.
- Species Senecio filicifolius Greenm. ex Rose & Standl.
- Species Senecio filicifolius Greenm. accepted as Senecio flaccidus var. monoensis (Greene) B.L.Turner & T.M.Barkley
- Species Senecio filifer Franch.
- Species Senecio filiferus Franch.
- Species Senecio filifolius P.J.Bergius
- Species Senecio filifolius Harv. accepted as Senecio mitophyllus C.Jeffrey
- Species Senecio filifolius Nutt. accepted as Senecio flaccidus var. flaccidus Less.
- Species Senecio filipes Turcz. accepted as Senecio matricariifolius DC.
- Species Senecio fimbrillifer (b. robinson) B.L.Rob. accepted as Senecio deltoideus Less.
- Species Senecio finlaysonianus Sch.Bip.
- Species Senecio firmipes Greenm. accepted as Pentacalia firmipes (Greenm.) Cuatrec.
- Species Senecio fischeri Sch.Bip. accepted as Erechtites hieraciifolius var. cacalioides (Fisch. ex Spreng.) Less. ex Griseb.
- Species Senecio fischerianus Steud.
- Species Senecio fistulosus Poepp. ex Less.
- Species Senecio fistulosus De Wild. accepted as Senecio subsessilis Oliv. & Hiern
- Species Senecio fistulosus Poepp. ex DC. accepted as Senecio fistulosus Poepp. ex Less.
- Species Senecio flabellatus Viv.
- Species Senecio flaccidifolius Wedd.
- Species Senecio flaccidus Less.
- Species Senecio flaccidus Bolle
- Species Senecio flaccidus A.Rich. accepted as Senecio spathulatus var. attenuatus I.Thomps.
- Species Senecio flagellifolius Cabrera
- Species Senecio flagellisectus Griseb. accepted as Senecio rudbeckiaefolius Meyen & Walp.
- Species Senecio flammeus Turcz. ex DC.
- Species Senecio flanaganii E.Phillips accepted as Senecio conrathii N.E.Br.
- Species Senecio flavovirens Rydb. accepted as Packera paupercula (Michx.) Á.Löve & D.Löve
- Species Senecio flavulus Greene accepted as Packera pseudaurea var. flavula (Greene) Trock & T.M.Barkley
- Species Senecio flavus (Decne.) Sch.Bip.
- Species Senecio fletcheri Hemsl. accepted as Cremanthodium ellisii var. ellisii
- Species Senecio flettii Wiegand accepted as Packera flettii (Wiegand) W.A.Weber & Á.Löve
- Species Senecio flexicaulis Edgew. accepted as Senecio scandens var. incisus Franch.
- Species Senecio flexuosus Less.
- Species Senecio flexuosus N.P.Balakr.
- Species Senecio flexuosus Wall.
- Species Senecio flexuosus E.D.Clarke
- Species Senecio flintii Rydb.
- Species Senecio floccidus Hombr. & Jacquinot ex Decne.
- Species Senecio floccidus Hombr. & Jacq. accepted as Senecio patagonicus Hook. & Arn.
- Species Senecio flocciferus DC. accepted as Malacothrix floccifera (DC.) S.F.Blake
- Species Senecio floccosus Schur
- Species Senecio floccosus Britton
- Species Senecio flocculatus (Sch.Bip.) Wedd.
- Species Senecio flocculidens Sch.Bip. ex Wedd. accepted as Pentacalia flocculidens (Sch.Bip. ex Wedd.) Cuatrec.
- Species Senecio flocoso-araneosus Steud. accepted as Senecio andinus H.Buek
- Species Senecio floresiorum B.L.Turner accepted as Roldana floresiorum (B.L.Turner) B.L.Turner
- Species Senecio floribundus (Kunth) Sch.Bip.
- Species Senecio floribundus Wall.
- Species Senecio floribundus Hieron. ex Sodiro
- Species Senecio floribundus (Kunth) Sch.Bip. ex Hieron. accepted as Critoniopsis floribunda (Kunth) H.Rob.
- Species Senecio floridanus Sch.Bip. accepted as Arnoglossum diversifolium (Torr. & A.Gray) H.Rob.
- Species Senecio floscosus Britton accepted as Pentacalia floccosa (Britton) Cuatrec.
- Species Senecio flosculosus Gilib.
- Species Senecio flosculosus Jord. accepted as Jacobaea vulgaris Gaertn.
- Species Senecio flosfragrans Cuatrec. accepted as Pentacalia flosfragrans (Cuatrec.) Cuatrec.
- Species Senecio fluminensis Steud.
- Species Senecio fluviatilis Wallr. accepted as Senecio sarracenicus L.
- Species Senecio fodinarum Greene
- Species Senecio foeniculaceus Ten. accepted as Senecio lividus L.
- Species Senecio foeniculoides Harv.
- Species Senecio foetens Sch.Bip.
- Species Senecio foetidus Howell accepted as Senecio hydrophiloides Rydb.
- Species Senecio foliatilis S.Moore accepted as Hubertia foliatilis (S.Moore) C.Jeffrey
- Species Senecio folidentatus Cuatrec.
- Species Senecio foliolosus Reiche
- Species Senecio foliosus (A.Gray) Rydb.
- Species Senecio foliosus Salzm.
- Species Senecio foliosus Reiche
- Species Senecio foliosus Colmeiro
- Species Senecio foliosus Salzm. ex DC. accepted as Jacobaea vulgaris Gaertn.
- Species Senecio fontainesii Lowe
- Species Senecio fontanicola Grulich & Hodálová
- Species Senecio fontanus Wallr.
- Species Senecio forbesii Oliv. & Hiern
- Species Senecio formosanus (Sasaki) Kitam.
- Species Senecio formosissimus Cuatrec.
- Species Senecio formosoides Cuatrec.
- Species Senecio formosus Kunth accepted as Senecio wedglacialis Cuatrec.
- Variety Senecio formosus var. angustifolius Wedd.
- Variety Senecio formosus var. formosus accepted as Senecio formosus Kunth
- Variety Senecio formosus var. latifolius Wedd.
- Variety Senecio formosus var. subruncinatus Wedd.
- Forma Senecio formosus f. formosus accepted as Senecio formosus Kunth
- Forma Senecio formosus f. obtusata Cuatrec.
- Forma Senecio formosus f. obtusatus Cuatrec.
- Species Senecio forskahlii Baill.
- Species Senecio forsteri (Spreng.) Schlecht. ex DC.
- Species Senecio forsteri Phil. accepted as Senecio patagonicus Hook. & Arn.
- Species Senecio forsteri Hook.f. accepted as Brachyglottis repanda J.R.Forst. & G.Forst.
- Species Senecio fortunatus Cuatrec.
- Species Senecio fosbergii Cuatrec. accepted as Talamancalia fosbergii (Cuatrec.) B.Nord.
- Species Senecio fradini Pomel
- Species Senecio fradinii Pomel accepted as Senecio leucanthemifolius subsp. mauritanicus (Pomel) Greuter
- Species Senecio fragrans Lehm.
- Species Senecio fragrans Lehm. ex Spreng.
- Species Senecio fragrans Fisch. ex Spreng.
- Species Senecio fragrans Riddell ex Torr. & A.Gray
- Species Senecio fragrantissimus Tortosa & Bartoli
- Species Senecio franchetianus H.Lév. accepted as Ligularia franchetiana (H.Lév.) Hand.-Mazz.
- Species Senecio franchetii C.Winkl.
- Species Senecio franciscanus Greene accepted as Packera franciscana (Greene) W.A.Weber & Á.Löve
- Species Senecio francisci Phil.
- Species Senecio francoisii Humbert
- Species Senecio fraternus Piper
- Species Senecio fraudulentus Phill. & C.A.Sm. accepted as Senecio inornatus DC.
- Species Senecio fraudulentus E.Phillips & C.A.Sm. accepted as Senecio inornatus DC.
- Species Senecio freemanii Britton & Greenm. accepted as Pentacalia freemanii (Britton & Greenm.) Cuatrec.
- Species Senecio fremontii Torr. & A.Gray
- Species Senecio fremontii (Torr. & A.Gray) Rydb. accepted as Senecio riddellii Torr. & A.Gray
- Species Senecio fresenii Sch.Bip.
- Species Senecio fresenii Sch.Bip. ex Oliv. & Hiern
- Species Senecio friesii Cabrera
- Species Senecio friesiorum Mildbr. accepted as Dendrosenecio adnivalis subsp. friesiorum (Mildbr.) E.B.Knox
- Species Senecio frigidophila Cuatrec.
- Species Senecio frigidophilus Cuatrec.
- Species Senecio frigidus Rupr.
- Species Senecio frigidus Steud.
- Species Senecio frigidus (Richardson) Less. accepted as Tephroseris frigida (Richardson) Holub
- Species Senecio frondosus Tausch ex Rchb.
- Species Senecio fruticosus Vell.
- Species Senecio fruticulosus Sibth. & Sm.
- Species Senecio fruticulosus Sm.
- Species Senecio fuchsii C.C.Gmel. accepted as Senecio ovatus (G.Gaertn., B.Mey. & Scherb.) Willd.
- Species Senecio fueginus Phil. accepted as Senecio miser Hook.f.
- Species Senecio fuertesii Urb.
- Species Senecio fukienensis Ling ex C.Jeffrey & Y.L.Chen
- Species Senecio fulgens Rydb. accepted as Packera streptanthifolia (Greene) W.A.Weber & Á.Löve
- Species Senecio fulgens (Hook.f.) G.Nicholson accepted as Kleinia fulgens Hook.f.
- Species Senecio fuliginosus Kunth accepted as Gynoxys fuliginosa (Kunth) Cass.
- Species Senecio fulvipes Ling accepted as Synotis fulvipes (Ling) C.Jeffrey & Y.L.Chen
- Species Senecio fulvus (Steven) Schischk.
- Species Senecio funckii Sch.Bip.
- Species Senecio funckii Sch.Bip. ex Wedd.
- Species Senecio furfuraceus Kotschy ex Boiss.
- Species Senecio furusei Kitam.
- Species Senecio fuscatus (Jord. & Fourr.) Hayek
- Species Senecio fussii Beck
- Species Senecio fussii Andrae
- Species Senecio futakii Hodálová
- Species Senecio gabonicus A.Chev.
- Species Senecio gabonicus Oliv. & Hiern accepted as Solanecio angulatus (Vahl) C.Jeffrey
- Species Senecio gaffatensis Vatke accepted as Senecio aegyptius var. discoideus Boiss.
- Species Senecio galeottii Hemsl.
- Species Senecio galicianus McVaugh accepted as Roldana galiciana (McVaugh) H.Rob. & Brettell
- Species Senecio gallerandianus Coss. & Durieu accepted as Jacobaea gallerandiana (Coss. & Durieu) Pelser
- Species Senecio gallicus Vill.
- Species Senecio gallicus Chaix
- Species Senecio galpinii (Hook.f.) Hook.f. accepted as Kleinia galpinii Hook.f.
- Species Senecio galpinii (Hook.f.) H.Jacobsen accepted as Kleinia galpinii Hook.f.
- Species Senecio gamolepis Cabrera
- Species Senecio gamolepoides Sch.Bip.
- Species Senecio ganderi T.M.Barkley & R.M.Beauch. accepted as Packera ganderi (T.M.Barkley & R.M.Beauch.) W.A.Weber & Á.Löve
- Species Senecio gandin P.Royen accepted as Papuacalia gandin (P.Royen) Veldkamp
- Species Senecio ganganensis Cabrera
- Species Senecio ganpinensis Vaniot accepted as Senecio nemorensis L.
- Species Senecio garaventai Cabrera
- Species Senecio garcibarrigae Cuatrec.
- Species Senecio gardneri (Thwaites) C.B.Clarke
- Species Senecio gardneri Cotton accepted as Dendrosenecio elgonensis subsp. barbatipes (Hedberg) E.B.Knox
- Species Senecio gargantanus (Cuatrec.) Cuatrec.
- Species Senecio gariepiensis Cron
- Species Senecio garlandii F.Muell. ex Belcher
- Species Senecio garnieri Klatt
- Species Senecio gaspensis Greenm. accepted as Packera paupercula (Michx.) Á.Löve & D.Löve
- Species Senecio gaudichaudianus A.Rich.
- Species Senecio gaudinii Gremli accepted as Tephroseris longifolia subsp. gaudinii (Gremli) Kerguélen
- Species Senecio gawlerensis M.E.Lawr.
- Species Senecio gayanus DC.
- Species Senecio gazensis S.Moore
- Species Senecio geifolius Sch.Bip.
- Species Senecio geissei Phil. accepted as Senecio proteus J.Rémy
- Species Senecio gelidus Wedd. accepted as Pentacalia gelida (Wedd.) Cuatrec.
- Species Senecio geminatus Kirk accepted as Traversia baccharoides Hook.f.
- Species Senecio geniculatus Steud.
- Species Senecio geniculipes Cuatrec.
- Species Senecio geniorum Humbert
- Species Senecio genisianus Cuatrec.
- Species Senecio gentilianus Vaniot accepted as Senecio wightii (DC. ex Wight) Benth. ex C.B.Clarke
- Species Senecio gentryi (H.Rob. & Brettell) B.L.Turner & T.M.Barkley
- Species Senecio genuflexus Greenm. accepted as Pentacalia genuflexa (Greenm.) Cuatrec.
- Species Senecio georgianus DC.
- Species Senecio georgianus Greenm.
- Species Senecio georgii Endl. accepted as Brachyglottis repanda J.R.Forst. & G.Forst.
- Species Senecio gerardii Gren. & Godr. accepted as Senecio provincialis (L.) Druce
- Species Senecio gerberifolius Sch.Bip. ex Hemsl.
- Species Senecio gerberifolius Sch.Bip.
- Species Senecio germainii Phil.
- Species Senecio germanicoglabratus Landolt
- Species Senecio germanicus Wallr. accepted as Senecio nemorensis subsp. jacquinianus Čelak.
- Species Senecio gerrardii Harv.
- Species Senecio gertii Zardini
- Species Senecio gesnerifolius B.L.Turner
- Species Senecio gesnerifolius Cuatrec. accepted as Dendrophorbium gesnerifolium (Cuatrec.) B.Nord.
- Species Senecio gesneriifolius B.L.Turner accepted as Roldana gesneriifolia C.Jeffrey
- Species Senecio ghiesbreghtii hort.hal. ex Regel accepted as Telanthophora grandifolia (Less.) H.Rob. & Brettell
- Species Senecio gibbiflorus Cuatrec. accepted as Pentacalia gibbiflora (Cuatrec.) Cuatrec.
- Species Senecio gibbonsii Greene accepted as Senecio triangularis Hook.
- Species Senecio gibbosus (Guss.) DC. accepted as Jacobaea gibbosa (Guss.) B.Nord. & Greuter
- Species Senecio gibraltaricus Rouy accepted as Senecio lopezii Boiss.
- Species Senecio gibsonii Hook.f.
- Species Senecio giessii Merxm.
- Species Senecio giganteus Desf. accepted as Jacobaea gigantea (Desf.) Pelser
- Species Senecio gigas Vatke accepted as Solanecio gigas (Vatke) C.Jeffrey
- Species Senecio gilbertii Turcz.
- Species Senecio gilgianus Muschl.
- Species Senecio gilgii Greenm. accepted as Roldana gilgii (Greenm.) H.Rob. & Brettell
- Species Senecio gilliesianus Hieron.
- Species Senecio gilliesii Hook. & Arn.
- Species Senecio gilliesii Phil. accepted as Senecio gilliesianus Hieron.
- Species Senecio gilvus Phil. accepted as Senecio gnidioides Phil.
- Species Senecio ginesii Cuatrec. accepted as Jacobaea maritima (L.) Pelser & Meijden
- Species Senecio giorgii De Wild. accepted as Solanecio cydoniifolius (O.Hoffm.) C.Jeffrey
- Species Senecio glabellus Poir.
- Species Senecio glabellus Turcz. ex DC. accepted as Tephroseris praticola (Schischk. & Serg.) Holub
- Species Senecio glaber Less.
- Species Senecio glaber [Clairv.]
- Species Senecio glaber Larrañaga
- Species Senecio glaber Ucria accepted as Senecio squalidus L.
- Species Senecio glaberrimus DC.
- Species Senecio glaberrimus Schur
- Species Senecio glaberrimus (Rochel) Simonk. accepted as Senecio doronicum subsp. transylvanicus (Boiss.) Nyman
- Species Senecio glabratus Hook. & Arn.
- Species Senecio glabrescens (DC.) Sch.Bip.
- Species Senecio glabrifolius DC.
- Species Senecio glacialis Sch.Bip.
- Species Senecio glacialis Marcow. accepted as Senecio leucanthemifolius subsp. caucasicus (DC.) Greuter
- Species Senecio glacialis Wedd. accepted as Senecio candollii Wedd.
- Species Senecio glacialis (Meyen & Walp.) Cuatrec. accepted as Senecio candollii Wedd.
- Species Senecio glandulifer Dematt. & Cristóbal
- Species Senecio glanduloso-hirtellus Reiche accepted as Senecio coquimbensis Phil.
- Species Senecio glanduloso-lanosus Thell.
- Species Senecio glanduloso-pilosus Volkens & Muschl.
- Species Senecio glandulosus Don ex Hook. & Arn.
- Species Senecio glandulosus A.Cunn. ex DC.
- Species Senecio glandulosus (DC.) Sch.Bip. accepted as Senecio campylocarpus I.Thomps.
- Species Senecio glareosus Sch.Bip. accepted as Senecio pflanzii (Perkins) Cuatrec.
- Species Senecio glastifolius L.f.
- Species Senecio glastifolius Hook.f. accepted as Brachyglottis kirkii var. kirkii (Hook.f. ex Kirk) C.J.Webb
- Species Senecio glaucescens Spreng.
- Species Senecio glaucescens DC. accepted as Senecio achilleifolius DC.
- Species Senecio glaucescens Rydb. accepted as Senecio lugens Richardson
- Species Senecio glauciifolius Rydb. accepted as Senecio eremophilus var. eremophilus Richardson
- Species Senecio glaucophyllus Cheeseman
- Species Senecio glaucus L.
- Species Senecio glaucus DC.
- Species Senecio glaziovii Baker
- Species Senecio glinophyllus (H.Rob. & Brettell) McVaugh
- Species Senecio globiger Chang accepted as Sinosenecio globiger (C.C.Chang) B.Nord.
- Species Senecio glochiatus Prokh.
- Species Senecio glochidiatus Prokh. accepted as Crepis pannonica (Jacq.) K.Koch
- Species Senecio glomeratus Desf. ex Poir.
- Species Senecio glomeratus Jeffrey accepted as Synotis glomerata (Jeffrey) C.Jeffrey & Y.L.Chen
- Species Senecio glossanthus (Sond.) Belcher
- Species Senecio glossophyllus Mattf. accepted as Papuacalia glossophylla (Mattf.) Veldkamp
- Species Senecio glumaceus Dunn accepted as Synotis erythropappa (Bureau & Franch.) C.Jeffrey & Y.L.Chen
- Species Senecio glutinarius DC.
- Species Senecio glutinosus Thunb.
- Species Senecio glutinosus Roth
- Species Senecio glutinosus E.Mey. ex DC.
- Species Senecio glutinosus Schur
- Species Senecio glutinosus E.Mey. accepted as Senecio glutinarius DC.
- Species Senecio gmelinii
- Species Senecio gmelinii Ledeb.
- Species Senecio gnaphalioides Sieber ex Spreng. accepted as Jacobaea gnaphalioides (Sieber ex Spreng.) Veldkamp
- Species Senecio gnaphalioides Sieber accepted as Jacobaea gnaphalioides (Sieber ex Spreng.) Veldkamp
- Species Senecio gnaphalodes Sieber
- Species Senecio gnidioides Phil.
- Species Senecio gnoma P.Royen
- Species Senecio godmanii Hemsl. accepted as Senecio doratophyllus Benth.
- Species Senecio goeringii Sch.Bip.
- Species Senecio goetzei O.Hoffm.
- Species Senecio goetzenii O.Hoffm. accepted as Solanecio goetzei (O.Hoffm.) C.Jeffrey
- Species Senecio goldmanii Greene
- Species Senecio goldsacki Phil.
- Species Senecio gomereus Kuntze accepted as Pericallis steetzii (Bolle) B.Nord.
- Species Senecio gonocaulos DC.
- Species Senecio gonocladus Sch.Bip.
- Species Senecio gonzaleziae B.L.Turner accepted as Roldana gonzaleziae (B.L.Turner) B.L.Turner
- Species Senecio goodianus Hand.-Mazz. accepted as Sinosenecio hederifolius (Dummer) B.Nord.
- Species Senecio goodspeedii Cuatrec. accepted as Dendrophorbium goodspeedii (Cuatrec.) H.Beltrán
- Species Senecio goringensis Hemsl. accepted as Cremanthodium ellisii var. ellisii
- Species Senecio gossweileri Torre
- Species Senecio gossypinus Baker
- Species Senecio gothicus Gand.
- Species Senecio goyazensis (Gardner) Cabrera accepted as Erechtites goyazensis (Gardner) Cabrera
- Species Senecio goyazensis Gardner accepted as Erechtites goyazensis (Gardner) Cabrera
- Species Senecio graciellae Cabrera
- Species Senecio graciliflorus (Wall.) DC.
- Species Senecio graciliflorus DC.
- Species Senecio gracilipes A.Gray
- Species Senecio gracilipes B.L.Rob. & Greenm.
- Species Senecio gracilis Arn. accepted as Senecio zeylanicus DC.
- Species Senecio gracilis Pursh accepted as Packera aurea (L.) Á.Löve & D.Löve
- Species Senecio graciliserra Mattf. accepted as Senecio lelyi Hutch.
- Species Senecio gracillimus C.Winkl. accepted as Tephroseris palustris (L.) Rchb.
- Species Senecio grahamii Hook.f. accepted as Senecio bombayensis N.P.Balakr.
- Species Senecio grahamii Benth. accepted as Roldana barba-johannis (DC.) H.Rob. & Brettell
- Species Senecio gramineticola C.Jeffrey
- Species Senecio gramineus Harv.
- Species Senecio graminicola C.A.Sm.
- Species Senecio graminicolus Sch.Bip.
- Species Senecio graminicolus C.A.Sm. accepted as Senecio retrorsus DC.
- Species Senecio graminifolius Jacq. accepted as Senecio chrysocoma Meerb.
- Species Senecio graminifolius Phil. accepted as Senecio zosterifolius Hook. & Arn.
- Species Senecio granatensis Boiss.
- Species Senecio grandidentatus Ledeb. accepted as Jacobaea erucifolia subsp. arenaria (Soó) B.Nord. & Greuter
- Species Senecio grandiflorus P.J.Bergius
- Species Senecio grandiflorus Meyen
- Species Senecio grandiflorus (DC.) H.Jacobsen accepted as Kleinia grandiflora (Wall. ex DC.) N.Rani
- Species Senecio grandiflorus Hoffmanns. & Link accepted as Senecio lopezii Boiss.
- Species Senecio grandifolius Less.
- Species Senecio grandis Gardner
- Species Senecio grandissimus Schur
- Species Senecio grandjotii Cabrera
- Species Senecio gran-sabanensis Aristeg. accepted as Pentacalia freemanii (Britton & Greenm.) Cuatrec.
- Species Senecio grantii (Oliv. & Hiern) Zonn. accepted as Kleinia grantii (Oliv. & Hiern) Hook.f.
- Species Senecio graveolens Wedd. accepted as Senecio nutans Sch.Bip.
- Species Senecio grayanus Hemsl.
- Species Senecio grayi Parry ex A.Gray
- Species Senecio greenei A.Gray accepted as Packera greenei (A.Gray) W.A.Weber & Á.Löve
- Species Senecio greenmanianus Hieron. accepted as Pentacalia greenmaniana (Hieron.) Cuatrec.
- Species Senecio greenmanii (H.Rob. & Brettell) L.O.Williams
- Species Senecio greenwayi C.Jeffrey
- Species Senecio gregatus Hilliard
- Species Senecio greggii Rydb. accepted as Senecio tampicanus DC.
- Species Senecio gregorianus DC.
- Species Senecio gregorii F.Muell.
- Species Senecio gregorii (S.Moore) H.Jacobsen accepted as Kleinia gregorii (S.Moore) C.Jeffrey
- Species Senecio grenierii Klatt accepted as Senecio erechtitioides Baker
- Species Senecio greyi Hook.f. accepted as Brachyglottis greyi (Hook.f.) B.Nord.
- Species Senecio griffithii Hook.f. & Thomson ex C.B.Clarke
- Species Senecio grimesii B.L.Turner accepted as Roldana grimesii (B.L.Turner) C.Jeffrey
- Species Senecio grindeliaefolius DC.
- Species Senecio grindeliifolius DC.
- Species Senecio grindeliifolius Bertero
- Species Senecio grisebachii Baker
- Species Senecio grossidens Dusén ex Malme
- Species Senecio grossidens Dusén
- Species Senecio gruenerii Cabrera
- Species Senecio grüneri Cabrera accepted as Senecio trichocodon Baker
- Species Senecio guadalajarensis B.L.Rob.
- Species Senecio guadalupe Cuatrec. accepted as Pentacalia guadalupe (Cuatrec.) Cuatrec.
- Species Senecio guantivanus Cuatrec. accepted as Monticalia pulchella (Kunth) C.Jeffrey
- Species Senecio guascensis Cuatrec.
- Species Senecio guatimalensis Sch.Bip. accepted as Senecio doratophyllus Benth.
- Species Senecio guatulamensis Muñoz-Schick, A.Moreira & Trenq.
- Species Senecio guayacanensis Phil. accepted as Senecio aristianus J.Rémy
- Species Senecio guerkei Hieron.
- Species Senecio guerrensis T.M.Barkley
- Species Senecio guerrerensis T.M.Barkley
- Species Senecio guicanensis Cuatrec. accepted as Pentacalia guicanensis (Cuatrec.) Cuatrec.
- Species Senecio guineensis Sch.Bip.
- Species Senecio gummifer Hook. & Arn.
- Species Senecio gunckelii Cabrera
- Species Senecio gundelius K.Koch
- Species Senecio gunnii (Hook.f.) Belcher
- Species Senecio gunnisii Baker accepted as Kleinia pendula (Forssk.) DC.
- Species Senecio gurkei Hieron.
- Species Senecio gwinnerianus Muschl. accepted as Senecio transmarinus var. virungae C.Jeffrey
- Species Senecio gyirongensis Y.L.Chen & K.Y.Pan accepted as Senecio biligulatus W.W.Sm.
- Species Senecio gymnocaulos Phil.
- Species Senecio gynoxoides Baker
- Species Senecio gynoxoides Sch.Bip. ex Wedd.
- Species Senecio gynura C.Winkl.
- Species Senecio gynuroides S.Moore accepted as Crassocephalum ducis-aprutii (Chiov.) S.Moore
- Species Senecio gynuropsis Muschl. accepted as Crassocephalum ducis-aprutii (Chiov.) S.Moore
- Species Senecio gypsicola (R.J.Bates) I.Thomps.
- Species Senecio gypsophilus Phil. accepted as Senecio microphyllus Phil.
- Species Senecio gyrophyllus Klatt accepted as Senecio macrocephalus DC.
- Species Senecio haastii Hook.f. accepted as Brachyglottis haastii (Hook.f.) B.Nord.
- Species Senecio haccidus Less.
- Species Senecio hachanus Cuatrec. accepted as Pentacalia hachana (Cuatrec.) Cuatrec.
- Species Senecio hadiensis Forssk.
- Species Senecio hadrosomus Svent. accepted as Pericallis hadrosoma (Svent.) B.Nord.
- Species Senecio haematophyllus Willd.
- Species Senecio haenkeanus Cuatrec.
- Species Senecio haenkei DC.
- Species Senecio hageniae R.E.Fr. accepted as Senecio maranguensis O.Hoffm.
- Species Senecio hainanensis C.C.Chang & Y.C.Tseng accepted as Sinosenecio hainanensis C.Jeffrey & Y.L.Chen
- Species Senecio haitiensis Krug & Urb.
- Species Senecio hajastanicus Sofieva
- Species Senecio hakeaefolius Bertero ex DC.
- Species Senecio hakeaefolius Hook. & Arn. accepted as Senecio viscosissimus Colla
- Species Senecio hakeifolius Bertero ex DC. accepted as Senecio hakeifolius var. hakeifolius
- Species Senecio halimifolius L.
- Species Senecio halleri Dandy accepted as Jacobaea uniflora (All.) Veldkamp
- Species Senecio hallianus G.D.Rowley
- Species Senecio hallii Hieron.
- Species Senecio hallii Britton accepted as Packera cana (Hook.) W.A.Weber & Á.Löve
- Species Senecio halophilus I.Thomps.
- Species Senecio haloragis J.Rémy
- Species Senecio hamamelidifolius Kunth
- Species Senecio hamamelifolius Kunth
- Species Senecio hamersleyensis I.Thomps.
- Species Senecio hamiltonianus Sch.Bip.
- Species Senecio hanburianus Dinter
- Species Senecio handelianus B.Nord. accepted as Synotis fulvipes (Ling) C.Jeffrey & Y.L.Chen
- Species Senecio hansenii G.Kunkel accepted as Pericallis hansenii (G.Kunkel) Sunding
- Species Senecio hansweberi Cuatrec.
- Species Senecio haplogynus F.Muell. accepted as Arrhenechthites haplogyna (F.Muell.) Mattf.
- Species Senecio harazianus Deflers
- Species Senecio harbourii Rydb. accepted as Packera cana (Hook.) W.A.Weber & Á.Löve
- Species Senecio harfordii Greenm. accepted as Packera bolanderi var. harfordii (Greenm.) Trock & T.M.Barkley
- Species Senecio harleyi D.J.N.Hind
- Species Senecio harrietae Cuatrec. accepted as Pentacalia harrietae (Cuatrec.) Cuatrec.
- Species Senecio hartianus A.Heller accepted as Packera hartiana (A.Heller) W.A.Weber & Á.Löve
- Species Senecio hartmanii Greenm. accepted as Packera neomexicana (A.Gray) W.A.Weber & Á.Löve
- Species Senecio hartmannii Greenm.
- Species Senecio hartwegii Benth. accepted as Roldana hartwegii (Benth.) H.Rob. & Brettell
- Species Senecio harveianus MacOwan accepted as Senecio inaequidens DC.
- Species Senecio hastatifolius Cabrera
- Species Senecio hastatus L.
- Species Senecio hastatus Hook.f.
- Species Senecio hastatus Willd.
- Species Senecio hastatus Bong. accepted as Senecio oleosus Vell.
- Species Senecio hastifolius Less.
- Species Senecio hastulatus L. accepted as Senecio hastatus L.
- Species Senecio hatcherianus O.Hoffm.
- Species Senecio hatcherianus O.Hoffm. ex Macloskie
- Species Senecio haticoensis Cuatrec.
- Species Senecio hatschbachii Cabrera
- Species Senecio haughtii Cuatrec. accepted as Pentacalia haughtii (Cuatrec.) Cuatrec.
- Species Senecio hauthalii Kuntze accepted as Senecio desideratus DC.
- Species Senecio hauwai Sykes
- Species Senecio hawarthii
- Species Senecio haworthii (Sweet) Sch.Bip.
- Species Senecio haworthii Steud.
- Species Senecio haygarthii M.Taylor ex Hilliard
- Species Senecio hebdingii (Rauh & Buchloh) Rauh
- Species Senecio hebdingii (Rauh & Buchloh) G.D.Rowley
- Species Senecio hebespermus DC.
- Species Senecio hebetatus Wedd.
- Species Senecio hectori Buchanan
- Species Senecio hectorii Buchanan accepted as Brachyglottis hectorii (Buchanan) B.Nord.
- Species Senecio hedbergii C.Jeffrey
- Species Senecio hederaefolius Buchinger & Sch.Bip. ex Klatt
- Species Senecio hederaefolius Hemsl. accepted as Roldana hederifolia (Hemsl.) H.Rob. & Brettell
- Species Senecio hederifolius Buch. & Sch.Bip.
- Species Senecio hederifolius Hemsl.
- Species Senecio hederiformis Cron
- Species Senecio hederoides Greenm. accepted as Roldana oaxacana (Hemsl.) H.Rob. & Brettell
- Species Senecio heimerlii Muellner
- Species Senecio heimii Humbert accepted as Hubertia heimii (Humbert) C.Jeffrey
- Species Senecio heldreichii Boiss. accepted as Tephroseris integrifolia (L.) Holub
- Species Senecio helenae Buscal. & Muschl.
- Species Senecio helenitis (L.) Schinz & Thell. accepted as Tephroseris helenitis (L.) B.Nord.
- Species Senecio helgae Cabrera
- Species Senecio helianthemoides Wedd.
- Species Senecio helianthoides Phil. accepted as Senecio prenanthifolius Phil.
- Species Senecio helianthus Franch. accepted as Cremanthodium helianthus (Franch.) W.W.Sm.
- Species Senecio helichrysoides F.Muell.
- Species Senecio heliophytoides Phil. accepted as Senecio linariifolius Poepp. ex DC.
- Species Senecio heliopsis Hilliard & B.L.Burtt
- Species Senecio hellerii Klatt
- Species Senecio helminthioides (Sch.Bip.) Hilliard
- Species Senecio helodes Benth.
- Species Senecio helwingii Beger ex Hegi
- Species Senecio hemmendorffii Malme
- Species Senecio hemsleyi Britten
- Species Senecio henrici Vaniot accepted as Senecio asperifolius Franch.
- Species Senecio henryi Hemsl. ex Forb. & Hemsl. accepted as Sinacalia tangutica (Maxim.) B.Nord.
- Species Senecio heracleifolius Hemsl.
- Species Senecio herbichia Steud.
- Species Senecio herborgii C.Jeffrey
- Species Senecio herborgii Soldano, Galasso & Banfi
- Species Senecio herborgii Soldano & al. accepted as Senecio nemorensis subsp. glabratus (Herborg) Oberpr.
- Species Senecio hercynicus Herborg
- Species Senecio heritieri W.Watson
- Species Senecio heritieri DC. accepted as Pericallis lanata (L'Hér.) B.Nord.
- Species Senecio hermannii B.Nord.
- Species Senecio hermosae Pit. accepted as Bethencourtia hermosae (Pit.) G.Kunkel
- Species Senecio herreianus Dinter
- Species Senecio herrerae Cabrera
- Species Senecio hervaloira Link ex Nyman
- Species Senecio herzogii Cabrera accepted as Pentacalia herzogii (Cabrera) Cuatrec.
- Species Senecio herzogii Beauverd ex Herzog accepted as Pentacalia herzogii (Cabrera) Cuatrec.
- Species Senecio hesperidum Jahand. & al.
- Species Senecio hesperidum Jahand., Maire & Weiller
- Species Senecio hesperius Greene accepted as Packera hesperia (Greene) W.A.Weber & Á.Löve
- Species Senecio heteroclinius DC. accepted as Senecio abruptus Thunb.
- Species Senecio heterodontus Greenm.
- Species Senecio heterodoxus Greene ex Rydb. accepted as Packera dimorphophylla var. dimorphophylla (Greene) W.A.Weber & Á.Löve
- Species Senecio heterogamus (Benth. ex Benth.) Hemsl. accepted as Roldana heterogama (Benth. ex Hemsl.) H.Rob. & Brettell
- Species Senecio heteroideus Klatt
- Species Senecio heteroloba Wedd.
- Species Senecio heteromorphus Hutch. & B.L.Burtt accepted as Crassocephalum radiatum S.Moore
- Species Senecio heteromorphus accepted as Crassocephalum radiatum S.Moore
- Species Senecio heterophyllus Thunb.
- Species Senecio heterophyllus Drège ex Harv. & Sond.
- Species Senecio heterophyllus DC. accepted as Senecio pilquensis H.Buek
- Species Senecio heterophyllus Colenso accepted as Erechtites minima (Poir.) DC.
- Species Senecio heteroschizus Baker
- Species Senecio heterotrichius DC.
- Species Senecio heuffelii Hoppe & Fürnr. accepted as Tephroseris papposa (Rchb.) Schur
- Species Senecio hewrensis Hook.f.
- Species Senecio heyneanus Sch.Bip.
- Species Senecio hiberniflorus Makino
- Species Senecio hibernus Makino accepted as Senecio scandens var. scandens
- Species Senecio hickenii Hauman
- Species Senecio hieracifolia Raf.
- Species Senecio hieracifolius Michx.
- Species Senecio hieraciifolius Forssk.
- Species Senecio hieraciifolius L. accepted as Erechtites hieraciifolius (L.) Raf. ex DC.
- Species Senecio hieraciiformis Kom. accepted as Tephroseris hieraciiformis (Kom.) Czerep.
- Species Senecio hieracioides DC.
- Species Senecio hieracium J.Rémy
- Species Senecio hieronymi Griseb.
- Species Senecio hilairianus Cabrera
- Species Senecio hildebrandtii Baker
- Species Senecio hillebrandii Christ
- Species Senecio hillii Greenm. accepted as Pentacalia hillii (Greenm.) Cuatrec.
- Species Senecio himalaensis Mukerjee accepted as Parasenecio quinquelobus var. quinquelobus
- Species Senecio himalayensis Franch. accepted as Cremanthodium pinnatifidum Benth.
- Species Senecio himalensis Klotzsch
- Species Senecio hindsii Benth. accepted as Senecio scandens var. scandens
- Species Senecio hindukushensis Kitam. accepted as Senecio krascheninnikovii Schischk.
- Species Senecio hintermannii Gattef. & Maire
- Species Senecio hintonii (H.Rob. & Brettell)
- Species Senecio hintoniorum B.L.Turner
- Species Senecio hirsuticaulis Greenm. accepted as Roldana hirsuticaulis (Greenm.) Funston
- Species Senecio hirsutilobus Hilliard
- Species Senecio hirsutulus Phil.
- Species Senecio hirsutus [Clairv.]
- Species Senecio hirtellus DC.
- Species Senecio hirthii Phil. accepted as Senecio philippii Sch.Bip. ex Wedd.
- Species Senecio hirtifolius DC.
- Species Senecio hirto-crassus Humbert
- Species Senecio hirtus Cabrera
- Species Senecio hispidissimus I.Thomps.
- Species Senecio hispidulus A.Cunn. accepted as Senecio scaberulus (Hook.f.) D.G.Drury
- Species Senecio hispidulus A.Rich. accepted as Senecio hispidulus var. hispidulus A.Rich.
- Species Senecio hitchcockii Cuatrec. accepted as Pentacalia hitchcockii (Cuatrec.) Cuatrec.
- Species Senecio hjertingii Cabrera
- Species Senecio hochstetteri Sch.Bip. ex A.Rich.
- Species Senecio hochstetteri Sch.Bip. ex Hochst.
- Species Senecio hockii De Wild. & Muschl. accepted as Emilia hockii (De Wild. & Muschl.) C.Jeffrey
- Species Senecio hodgsoni Hook.f. ex Henry
- Species Senecio hoehnei Cabrera
- Species Senecio hoepfnerianus Vatke
- Species Senecio hoffmannianus Muschl. accepted as Emilia discifolia (Oliv.) C.Jeffrey
- Species Senecio hoffmannii Klatt accepted as Pseudogynoxys cummingii (Benth. ex Oerst.) H.Rob. & Cuatrec.
- Species Senecio hoggariensis Batt. & Trab.
- Species Senecio hohenacke
- Species Senecio hohenackeri Sch.Bip. ex Sch.Bip.
- Species Senecio hohenackeri Hook.f. accepted as Senecio madrasensis C.Jeffrey
- Species Senecio hoi Dunn
- Species Senecio hollandii Compton
- Species Senecio hollermayerii Cabrera accepted as Senecio chionophilus Phil.
- Species Senecio hollickii Britton ex Greenm. accepted as Odontocline hollickii (Britton ex Greenm.) B.Nord.
- Species Senecio holmii Greene accepted as Senecio amplectens var. holmii (Greene) H.D.Harr.
- Species Senecio holophyllus J.Rémy accepted as Senecio laevicaulis DC.
- Species Senecio holubii Hutch. & Burtt Davy
- Species Senecio homblei De Wild. accepted as Emilia homblei (De Wild.) C.Jeffrey
- Species Senecio homogynefolius Kotschy ex Boiss.
- Species Senecio homogyniphyllus Cummins accepted as Sinosenecio homogyniphyllus (Cumm.) B.Nord.
- Species Senecio homogynoides Klatt
- Species Senecio homoplasticus S.Moore
- Species Senecio hooglandii Belcher
- Species Senecio hookeri (ex Decne.) Hombr. & Jacq.
- Species Senecio hookeri Hombr. & Jacquinot ex Decne.
- Species Senecio hookeri Jacq.
- Species Senecio hookeri Torr. & A.Gray accepted as Senecio integerrimus var. exaltatus (Nutt.) Cronquist
- Species Senecio hookerianus H.Jacobsen accepted as Kleinia fulgens Hook.f.
- Species Senecio hoppeanus Dalla Torre
- Species Senecio hortensiae A.M.Teles
- Species Senecio hotteanus Urb. & Ekman
- Species Senecio howeanus Belcher
- Species Senecio howellii Greene accepted as Packera cana (Hook.) W.A.Weber & Á.Löve
- Species Senecio huachucanus A.Gray accepted as Senecio multidentatus var. huachucanus (A.Gray) T.M.Barkley
- Species Senecio huaguilicus Cabrera & Zardini
- Species Senecio huallaganus Cuatrec. accepted as Pentacalia huallagana (Cuatrec.) Cuatrec.
- Species Senecio hualtaranensis Petenatti, Ariza & Del Vitto
- Species Senecio hualtaranensis Peten., Ariza & Del Vitto
- Species Senecio hualtata Bertero ex DC.
- Species Senecio huamaliensis Cabrera accepted as Pentacalia huamaliensis (Cabrera) Cuatrec.
- Species Senecio huanuconus Cuatrec. accepted as Nordenstamia huanucona (Cuatrec.) B.Nord.
- Species Senecio huasensis Cuatrec.
- Species Senecio huayacocotlana Turner
- Species Senecio hubertia Pers.
- Species Senecio hugonis S.Moore accepted as Synotis nagensium (C.B.Clarke) C.Jeffrey & Y.L.Chen
- Species Senecio hui Chang accepted as Synotis hieraciifolia (H.Lév.) C.Jeffrey & Y.L.Chen
- Species Senecio huilensis Cuatrec. accepted as Pentacalia huilensis (Cuatrec.) Cuatrec.
- Species Senecio huitrinicus Cabrera
- Species Senecio humbertii C.C.Chang
- Species Senecio humbertii (Guillaumin) H.Jacobsen
- Species Senecio humbertii Chang
- Species Senecio humblotii Klatt accepted as Hubertia humblotii (Klatt) C.Jeffrey
- Species Senecio humboldtianus DC. accepted as Monticalia angustifolia (Kunth) B.Nord.
- Species Senecio humidanus C.Jeffrey
- Species Senecio humifusus (Hook.f.) Cabrera
- Species Senecio humilis Poepp.
- Species Senecio humilis Duby ex Nyman
- Species Senecio humilis Desf. accepted as Senecio leucanthemifolius Poir.
- Species Senecio humillimus Sch.Bip. ex Wedd.
- Species Senecio humillimus Sch.Bip.
- Species Senecio humphreysii R.D.Good accepted as Senecio ×pirottae Chiov.
- Species Senecio hunanensis Ling
- Species Senecio hunanensis Hand.-Mazz. accepted as Synotis fulvipes (Ling) C.Jeffrey & Y.L.Chen
- Species Senecio huntii F.Muell. accepted as Brachyglottis huntii (F.Muell.) B.Nord.
- Species Senecio hyadesii Franch.
- Species Senecio hybridus Scheidw.
- Species Senecio hybridus (Willd.) Hort. ex Regel accepted as Pericallis hybrida (Regel) B.Nord.
- Species Senecio hydrophiloides Rydb.
- Species Senecio hydrophilus Nutt.
- Species Senecio hydrophilus Hoffmanns. & Link ex Nyman
- Species Senecio hyemalis Salzm. ex Ball
- Species Senecio hygrophilus R.A.Dyer & C.A.Sm. accepted as Senecio humidanus C.Jeffrey
- Species Senecio hygrophilus Cuatrec. accepted as Senecio burkartii Cabrera
- Species Senecio hygrophilus Klatt accepted as Cineraria anampoza f. hygrophila (Klatt) Cron
- Species Senecio hyoseridifolius Wedd.
- Species Senecio hyoseridis (Benth.) L.Salomón & S.E.Freire
- Species Senecio hypargyraeus DC.
- Species Senecio hyperborealis Greenm. accepted as Packera hyperborealis (Greenm.) Á.Löve & D.Löve
- Species Senecio hypochionaeus Boiss. accepted as Iranecio hypochionaeus (Boiss.) C.Jeffrey
- Species Senecio hypochoerideus DC.
- Species Senecio hypoleucus F.Muell. ex Benth.
- Species Senecio hypoleucus Muschl. accepted as Dendrosenecio adnivalis subsp. friesiorum (Mildbr.) E.B.Knox
- Species Senecio hypomalacus Greenm. accepted as Roldana oaxacana (Hemsl.) H.Rob. & Brettell
- Species Senecio hypomallus Benoist accepted as Senecio pindilicensis Hieron.
- Species Senecio hypotrichus Greenm. accepted as Packera coahuilensis (Greenm.) C.Jeffrey
- Species Senecio hypsiandinus Cuatrec.
- Species Senecio hypsobates Wedd.
- Species Senecio hypsophilus Phil. accepted as Senecio aspericaulis J.Rémy
- Species Senecio ianthinus Mattf. accepted as Senecio erubescens var. erubescens Aiton
- Species Senecio ibari Phil. accepted as Senecio tricuspidatus Hook. & Arn.
- Species Senecio ibarii Phil.
- Species Senecio iberensis Gand.
- Species Senecio iberidifolius Phil. accepted as Senecio crithmoides Hook. & Arn.
- Species Senecio icaensis H.Beltrán & A.Galán
- Species Senecio icoglossoides Arechav.
- Species Senecio icoglossus DC.
- Species Senecio idahoensis Rydb. accepted as Packera indecora (Greene) Á.Löve & D.Löve
- Species Senecio ignobilis Sch.Bip. ex Baker accepted as Erechtites ignobilis Baker
- Species Senecio igoschinae Schischk. accepted as Tephroseris integrifolia subsp. igoschinae (Schischk.) Sennikov
- Species Senecio ilicetorum Davidson
- Species Senecio ilicifolius L.
- Species Senecio ilicifolius Less.
- Species Senecio ilicifolius P.J.Bergius
- Species Senecio ilicifolius Thunb.
- Species Senecio iljinii Schischk.
- Species Senecio ilkasiensis (Freyn & Sint.) Bornm. accepted as Iranecio hypochionaeus (Boiss.) C.Jeffrey
- Species Senecio illapelinus Phil.
- Species Senecio illinitus Phil.
- Species Senecio iloensis Hieron.
- Species Senecio ilsae A.Santos & Reyes-Bet.
- Species Senecio imaii Nakai accepted as Tephroseris subdentata (Bunge) Holub
- Species Senecio imbaburensis Sklenář & Marhold
- Species Senecio imbricatifolius Sch.Bip. ex Wedd.
- Species Senecio imbricatus Gardner accepted as Hoehnephytum imbricatum (Gardner) Cabrera
- Species Senecio imbricatus Greene accepted as Senecio lugens Richardson
- Species Senecio immixtus C.Jeffrey
- Species Senecio immunis Wallr.
- Species Senecio imoleus Boiss. & Heldr. ex Orph.
- Species Senecio imparipinnatus Klatt accepted as Packera tampicana (DC.) C.Jeffrey
- Species Senecio implexus P.R.O.Bally accepted as Kleinia implexa (P.R.O.Bally) C.Jeffrey
- Species Senecio implicatus Gand.
- Species Senecio inaequidens DC.
- Species Senecio inaequilobus Sch.Bip. ex Boiss.
- Species Senecio inamoenus DC. accepted as Senecio glutinosus Thunb.
- Species Senecio incae Phil. accepted as Senecio uspallatensis Hook. & Arn.
- Species Senecio incaicus Cuatrec. accepted as Senecio infernalis Cabrera
- Species Senecio incanus Lapeyr.
- Species Senecio incanus Scop.
- Species Senecio incanus Boeber
- Species Senecio incanus L. accepted as Jacobaea incana (L.) Veldkamp
- Species Senecio incarnatus Lowe ex DC.
- Species Senecio incertus DC. accepted as Senecio tuberosus (DC.) Harv.
- Species Senecio incisifolia (P.R.O.Bally) H.Jacobsen
- Species Senecio incisifolius Jeffrey accepted as Nemosenecio incisifolius (Jeffrey) B.Nord.
- Species Senecio incisus Thunb.
- Species Senecio incisus Lojac.
- Species Senecio incisus (C.Presl) C.Presl accepted as Senecio squalidus L.
- Species Senecio incognitus Cabrera accepted as Senecio madagascariensis Poir.
- Species Senecio incomptus DC.
- Species Senecio incomptus Banks & Sol. ex Hook.f.
- Species Senecio inconstans DC. accepted as Senecio repandus Thunb.
- Species Senecio incrassatus Lowe
- Species Senecio incrassatus Guss. accepted as Senecio leucanthemifolius Poir.
- Species Senecio incurvus A.Nelson accepted as Senecio spartioides Torr. & A.Gray
- Species Senecio indecorus Greene accepted as Packera indecora (Greene) Á.Löve & D.Löve
- Species Senecio indicus Backer ex K.Heyne
- Species Senecio indicus Backer accepted as Kleinia grandiflora (Wall. ex DC.) N.Rani
- Species Senecio inexpectatus (Cronquist) Al Schneid.
- Species Senecio infernalis Cabrera
- Species Senecio infestus Salisb.
- Species Senecio infiernillensis Cuatrec.
- Species Senecio infimus Cabrera
- Species Senecio infirmus C.Jeffrey
- Species Senecio ingeliensis Hilliard
- Species Senecio ingens Benoist accepted as Dendrophorbium ingens (Benoist) B.Nord.
- Species Senecio inghamii Montesinos
- Species Senecio innovans Klatt accepted as Senecio subulatus var. subulatus
- Species Senecio inophyllus Phill. & C.A.Sm. accepted as Senecio glaberrimus DC.
- Species Senecio inophyllus E.Phillips & C.A.Sm. accepted as Senecio glaberrimus DC.
- Species Senecio inops Boiss. & Balansa accepted as Jacobaea inops (Boiss. & Balansa) B.Nord.
- Species Senecio inornatus DC.
- Species Senecio insignis Hemsl.
- Species Senecio insizwaensis O.Hoffm. & Muschl.
- Species Senecio insubricus (Chenevard) Flatscher, Schneew. & Schönsw.
- Species Senecio insularis Muschl.
- Species Senecio insularis Benth. accepted as Lordhowea insularis (Benth.) B.Nord.
- Species Senecio intactus Moench
- Species Senecio integerrimus Nutt.
- Species Senecio integerrimus A.Gray
- Species Senecio integrifolius Kern.
- Species Senecio integrifolius Hook.
- Species Senecio integrifolius Simonk.
- Species Senecio integrifolius [Clairv.]
- Species Senecio integrifolius Nutt.
- Species Senecio integrifolius (L.) Clairv. accepted as Tephroseris integrifolia (L.) Holub
- Species Senecio intermedius Wiesb.
- Species Senecio intermedius Wight accepted as Senecio scandens var. scandens
- Species Senecio intermedius Hayata accepted as Syneilesis intermedia (Hayata) Kitam.
- Species Senecio interpositus I.Thomps.
- Species Senecio intrepidus Greenm.
- Species Senecio intricatus S.Moore
- Species Senecio inutilis Speg. accepted as Senecio bracteolatus Hook. & Arn.
- Species Senecio invalidus C.Jeffrey
- Species Senecio invenustus Greene accepted as Senecio fremontii var. blitoides (Greene) Cronquist
- Species Senecio involucratus (Kunth) DC.
- Species Senecio involutus Klatt
- Species Senecio iochanensis H.Lév. accepted as Ligularia wilsoniana (Hemsl.) Greenm.
- Species Senecio iodanthus Greenm.
- Species Senecio iodopappus Sch.Bip. accepted as Chersodoma jodopappa Cabrera
- Species Senecio ionodasys Hand.-Mazz. accepted as Synotis ionodasys (Hand.-Mazz.) C.Jeffrey & Y.L.Chen
- Species Senecio ionophyllus Greene accepted as Packera ionophylla (Greene) W.A.Weber & Á.Löve
- Species Senecio iosensis G.D.Rowley accepted as Senecio sulcicalyx Baker
- Species Senecio iranicus B.Nord.
- Species Senecio irgangii Matzenb. & Mondin
- Species Senecio irkutensis Popov
- Species Senecio irregularibracteatus De Wild. accepted as Emilia irregularibracteata (De Wild.) C.Jeffrey
- Species Senecio irregularis Phil. accepted as Senecio bahioides Hook. & Arn.
- Species Senecio isabelis S.Díaz
- Species Senecio isatideus DC.
- Species Senecio isatidioides E.Phillips & C.A.Sm.
- Species Senecio iscoensis Hieron. accepted as Senecio senecioides (Kunth) Kuntze
- Species Senecio iserni Phil.
- Species Senecio isernii Phil.
- Species Senecio isernii Cuatrec. accepted as Chersodoma juanisernii (Cuatrec.) Cuatrec.
- Species Senecio ishcaivilcanus Cuatrec.
- Species Senecio italicus Schischk. accepted as Tephroseris longifolia subsp. gaudinii (Gremli) Kerguélen
- Species Senecio itatiaiae Dusén
- Species Senecio ivohibeensis Humbert accepted as Hubertia ivohibeensis (Humbert) C.Jeffrey
- Species Senecio jacalensis Greenm.
- Species Senecio jacksonii S.Moore
- Species Senecio jacobaea L. accepted as Jacobaea vulgaris Gaertn.
- Species Senecio jacobaea Brot. ex Willk. & Lange
- Species Senecio jacobaea D.Don
- Species Senecio jacobaea Kunze
- Species Senecio jacobaea Loscos & Pardo
- Species Senecio jacobaeiformis Murr
- Species Senecio jacobaeiformis J.Rémy
- Species Senecio jacobaeoides Willk. accepted as Jacobaea vulgaris Gaertn.
- Species Senecio jacobeiformis
- Species Senecio jacobsenii G.D.Rowley accepted as Kleinia petraea (R.E.Fr.) C.Jeffrey
- Species Senecio jacottetianus Thell.
- Species Senecio jacquemontianus (Decne.) C.B.Clarke accepted as Ligularia jacquemontiana (Decne.) M.A.Rau
- Species Senecio jacquemontianus (Decne.) Benth. ex Hook.f. accepted as Ligularia jacquemontiana (Decne.) M.A.Rau
- Species Senecio jacquinianus Rchb. accepted as Senecio nemorensis subsp. jacquinianus Čelak.
- Species Senecio jacsonii H.Lév.
- Species Senecio jacuticus Schischk.
- Species Senecio jaffuelii Cabrera
- Species Senecio jagensis Steud.
- Species Senecio jahnii Cuatrec.
- Species Senecio jailicola Juz. accepted as Tephroseris integrifolia subsp. jailicola (Juz.) Greuter
- Species Senecio jalcanus Cuatrec. accepted as Pentacalia jalcana (Cuatrec.) Cuatrec.
- Species Senecio jaliscanus S.Watson
- Species Senecio jamaicensis DC. accepted as Gynoxys incana (Sw.) Less.
- Species Senecio jamesii Hemsl. accepted as Ligularia jamesii (Hemsl.) Kom.
- Species Senecio jamesonii Spruce
- Species Senecio jamesonii Spruce ex Klatt accepted as Pseudogynoxys sonchoides (Kunth) Cuatrec.
- Species Senecio janthophyllus Franch. accepted as Parasenecio ianthophyllus (Franch.) Y.L.Chen
- Species Senecio japonicus (Thunb.) Sch.Bip. accepted as Ligularia japonica (Thunb.) Less.
- Species Senecio japonicus Less. accepted as Farfugium japonicum (L.) Kitam.
- Species Senecio japonicus Thunb. accepted as Gynura japonica (Thunb.) Juel
- Species Senecio jarae Phil.
- Species Senecio jatrophoides (Kunth) Hemsl. accepted as Digitacalia jatrophoides (Kunth) Pippen
- Species Senecio jatrophoides (Kunth) Sch.Bip. accepted as Digitacalia jatrophoides (Kunth) Pippen
- Species Senecio javanicus (Burm.f.) Koord. accepted as Emilia coccinea (Sims) G.Don
- Species Senecio javanicus Willd. accepted as Senecio coronopifolius Burm.f.
- Species Senecio jeffreyanus Lisowski accepted as Senecio lisowskii Long Wang & Beentje
- Species Senecio jeffreyanus Diels accepted as Ligularia kanaitzensis var. kanaitzensis
- Species Senecio jelskii Hieron. accepted as Pentacalia jelskii (Hieron.) Cuatrec.
- Species Senecio jilesii Cabrera
- Species Senecio jinotegensis Klatt
- Species Senecio jobii Cabrera
- Species Senecio jodopappus Sch.Bip. accepted as Chersodoma jodopappa Cabrera
- Species Senecio jodopappus Sch.Bip. ex Wedd. accepted as Chersodoma jodopappa Cabrera
- Species Senecio johannesburgensis (S.Moore) S.Moore accepted as Senecio hieracioides DC.
- Species Senecio joharchii F.Ghahrem., Ezazi, Rahch. & Attar
- Species Senecio johnstonianus Cabrera
- Species Senecio johnstonii Oliv.
- Species Senecio jonesii Rydb. accepted as Packera streptanthifolia (Greene) W.A.Weber & Á.Löve
- Species Senecio joppensis Dinsm. accepted as Senecio glaucus L.
- Species Senecio jorquerae Phil.
- Species Senecio josei Sklenář
- Species Senecio jowaiensis N.P.Balakr. accepted as Synotis jowaiensis (N.P.Balakr.) R.Mathur
- Species Senecio juanisernii Cuatrec. accepted as Chersodoma juanisernii (Cuatrec.) Cuatrec.
- Species Senecio juergensii Mattf.
- Species Senecio jugicola S.Moore accepted as Senecio maranguensis O.Hoffm.
- Species Senecio jujuyensis Cabrera
- Species Senecio julianus Speg.
- Species Senecio julietii Phil. accepted as Senecio bipontinii Wedd.
- Species Senecio juncalensis Phil. accepted as Senecio chrysolepis Phil.
- Species Senecio junceus (DC.) Harv.
- Species Senecio junceus J.F.Gmel.
- Species Senecio jungei Phil.
- Species Senecio jungioides Cabrera
- Species Senecio juniperinus L.f.
- Species Senecio junodianus Schinz
- Species Senecio junodianus O.Hoffm. accepted as Senecio madagascariensis Poir.
- Species Senecio junodii Hutch. & Burtt Davy
- Species Senecio jurgensenii Hemsl.
- Species Senecio jurineifolius Boiss. & Balansa accepted as Iranecio jurineifolius (Boiss. & Balansa) C.Jeffrey ex Negaresh
- Species Senecio jussieui Klatt ex Hieron.
- Species Senecio jussieui Klatt accepted as Pseudogynoxys cordifolia (Cass.) Cabrera
- Species Senecio jusssieui Klatt ex Hieron.
- Species Senecio kacondensis S.Moore
- Species Senecio kaempferi (Siebold & Zucc.) DC. accepted as Farfugium japonicum (L.) Kitam.
- Species Senecio kahuzicus Humbert accepted as Dendrosenecio erici-rosenii subsp. erici-rosenii (R.E.Fr. & T.C.E.Fr.) E.B.Knox
- Species Senecio kalambatitrensis Humbert
- Species Senecio kalingenwae Hilliard & B.L.Burtt
- Species Senecio kalmii Nutt.
- Species Senecio kalmii Hook. & Arn.
- Species Senecio kalmii Less.
- Species Senecio kamerunensis Mattf.
- Species Senecio kamtschaticus Ledeb.
- Species Senecio kamtschaticus Kom. accepted as Tephroseris pseudoaurantiaca (Kom.) Czerep.
- Species Senecio kanaitzensis Franch. accepted as Ligularia kanaitzensis (Franch.) Hand.-Mazz.
- Species Senecio kandambren P.Royen accepted as Papuacalia kandambren (P.Royen) Veldkamp
- Species Senecio kansuensis Franch. accepted as Cremanthodium humile Maxim.
- Species Senecio kanzibiensis Humbert & Staner accepted as Solanecio kanzibiensis (Humbert & Staner) C.Jeffrey
- Species Senecio karaguensis O.Hoffm.
- Species Senecio karataviensis Lipsch.
- Species Senecio karelinioides C.Winkl. accepted as Synotis karelinioides (C.Winkl.) C.Ren, Lazkov & I.D.Illar.
- Species Senecio karjaginii Sofieva accepted as Tephroseris integrifolia subsp. primulifolia (Cufod.) Greuter
- Species Senecio karstenii Hieron.
- Species Senecio kaschkarowi C.Winkl. accepted as Senecio faberi Hemsl.
- Species Senecio kashmirianus N.P.Balakr. accepted as Senecio krascheninnikovii var. krascheninnikovii
- Species Senecio kassnerianus Muschl. accepted as Crassocephalum kaessnerianum (Muschl.) Lisowski
- Species Senecio katangensis O.Hoffm.
- Species Senecio katangensis O.Hoffm. ex De Wild.
- Species Senecio katubensis S.Moore
- Species Senecio kawaguchii Kitam. accepted as Senecio thianschanicus Regel & Schmalh.
- Species Senecio kawakamii Makino
- Species Senecio kawakamii Kitam. accepted as Tephroseris phaeantha (Nakai) C.Jeffrey & Y.L.Chen
- Species Senecio kayomborum Beentje
- Species Senecio kebdanicus Maire & Sennen accepted as Senecio leucanthemifolius subsp. mauritanicus (Pomel) Greuter
- Species Senecio kematongensis Vaniot accepted as Senecio nemorensis L.
- Species Senecio keniensis Baker f.
- Species Senecio keniodendron R.E.Fr. & T.C.E.Fr. accepted as Dendrosenecio keniodendron (R.E.Fr. & T.C.E.Fr.) B.Nord.
- Species Senecio keniophytum R.E.Fr.
- Species Senecio kenteicus Grub.
- Species Senecio kenteicus Grubov
- Species Senecio kerberi Greenm.
- Species Senecio kerdousianus Gómiz & Llamas
- Species Senecio kermadecensis Belcher
- Species Senecio kermesinus Hemsl. accepted as Pseudogynoxys haenkei (DC.) Cabrera
- Species Senecio kernensis Greenm.
- Species Senecio kerneri Błocki ex Nyman
- Species Senecio kerneri Venzo ex Pamp.
- Species Senecio keshna Cabrera
- Species Senecio keshua Cabrera
- Species Senecio khasianus N.P.Balakr. accepted as Senecio obtusatus Wall. ex DC.
- Species Senecio khorasanicus Rech.f. & Aellen accepted as Senecio paulsenii subsp. khorasanicus (Rech.f. & Aellen) B.Nord.
- Species Senecio kialensis Franch. accepted as Cremanthodium potaninii C.Winkl.
- Species Senecio kickxii Steud.
- Species Senecio kilimanjari Mildbr. accepted as Dendrosenecio kilimanjari subsp. kilimanjari
- Species Senecio killipii Cabrera
- Species Senecio kingbishopii Cuatrec.
- Species Senecio kingianus W.W.Sm.
- Species Senecio kingii Hook.f.
- Species Senecio kingii Greenm.
- Species Senecio kingii Rydb. accepted as Senecio eremophilus var. kingii (Rydb.) Greenm.
- Species Senecio kirghisicus DC. accepted as Senecio paucifolius S.G.Gmel.
- Species Senecio kirilowii Turcz. ex DC. accepted as Tephroseris kirilowii (Turcz. ex DC.) Holub
- Species Senecio kirkii Hook.f. ex Kirk accepted as Brachyglottis kirkii var. kirkii (Hook.f. ex Kirk) C.J.Webb
- Species Senecio kirschsteineanus Muschl. accepted as Cineraria deltoidea Sond.
- Species Senecio kivuensis Muschl. accepted as Emilia kivuensis (Muschl.) C.Jeffrey
- Species Senecio kiwuensi Muschl.
- Species Senecio kjellmanii A.E.Porsild accepted as Tephroseris kjellmanii (A.E.Porsild) Holub
- Species Senecio klattii Greenm.
- Species Senecio kleinia (L.) Less. accepted as Kleinia neriifolia Haw.
- Species Senecio kleiniaeformis
- Species Senecio kleiniiformis Suess. accepted as Senecurio kleiniiformis (Suess.) Gideon F.Sm. & Figueiredo
- Species Senecio kleinioides Kunth
- Species Senecio kleinioides (Sch.Bip.) Oliv. & Hiern accepted as Kleinia kleinioides (Sch.Bip.) M.Taylor
- Species Senecio klingbergii Mattf.
- Species Senecio klinghardtianus Dinter accepted as Senecio sulcicalyx Baker
- Species Senecio klugii Greenm. accepted as Pentacalia reflexa (Kunth) Cuatrec.
- Species Senecio kochii Ledeb.
- Species Senecio koelzii Rech.f. accepted as Senecio renardii C.Winkl.
- Species Senecio kolenatianus C.A.Mey.
- Species Senecio kongboensis Ludlow
- Species Senecio korabensis Kümmerle & Javorka accepted as Tephroseris integrifolia (L.) Holub
- Species Senecio koreanus Kom. accepted as Tephroseris koreana (Kom.) B.Nord. & Pelser
- Species Senecio korintjianus Boerl. accepted as Senecio sumatranus Martelli
- Species Senecio korshinskyi Krasch.
- Species Senecio kosterae Cabrera
- Species Senecio kotschyanus Boiss.
- Species Senecio koualapensis Franch. accepted as Parasenecio koualapensis (Franch.) Y.L.Chen
- Species Senecio krameri Franch. & Sav.
- Species Senecio krameri P. Courtois
- Species Senecio krameri Hayata
- Species Senecio krapovickasii Cabrera
- Species Senecio krascheninnikovii Schischk.
- Species Senecio krauseanus Muschl.
- Species Senecio kraussii Sch.Bip.
- Species Senecio krukoffii Cuatrec. accepted as Dendrophorbium krukoffii (Cuatrec.) C.Jeffrey
- Species Senecio krylovii Schischk.
- Species Senecio kryophilus Woronow ex Grossh.
- Species Senecio kuanshanensis C.I Peng & S.W.Chung
- Species Senecio kubensis Grossh. accepted as Iranecio kubensis (Grossh.) C.Jeffrey
- Species Senecio kuekenthalii Urb. & Ekman
- Species Senecio kuhbieri Cuatrec.
- Species Senecio kuhlmannii Cabrera
- Species Senecio kukul P.Royen accepted as Papuacalia kukul (P.Royen) Veldkamp
- Species Senecio kukulensis Woł.
- Species Senecio kuluensis S.Moore
- Species Senecio kumaonensis Duthie ex C.Jeffrey & Y.L.Chen
- Species Senecio kunawarensis N.C.Nair accepted as Cremanthodium ellisii (Hook.f.) Kitam.
- Species Senecio kundaicus C.E.C.Fisch.
- Species Senecio kundelungensis Lisowski
- Species Senecio kunlunshanicus C.H.An
- Species Senecio kunthianus Wall. ex DC.
- Species Senecio kunthianus Wall.
- Species Senecio kunturinus Cabrera
- Species Senecio kuntzeanus Dinter
- Species Senecio kuntzei Rydb.
- Species Senecio kuntzei O.Hoffm. accepted as Senecio glaberrimus DC.
- Species Senecio kurtzii Albov ex Phil.
- Species Senecio kurtzii Phil.
- Species Senecio kurzii C.B.Clarke ex Hook.f.
- Species Senecio kyimbilensis Mattf. accepted as Crassocephalum uvens (Hiern) S.Moore
- Species Senecio labordei Vaniot accepted as Ligularia dentata (A.Gray) Hara
- Species Senecio lacarensis Phil. accepted as Senecio linariifolius Poepp. ex DC.
- Species Senecio laceratus (F.Muell.) Belcher
- Species Senecio lacerus Boiss.
- Species Senecio lachnorhizus O.Hoffm. accepted as Senecio coronatus (Thunb.) Harv.
- Species Senecio laciniatus Gray
- Species Senecio laciniatus Schousb. ex Willk. & Lange
- Species Senecio laciniatus Hook.f.
- Species Senecio laciniatus DC.
- Species Senecio laciniatus Kunth accepted as Dorobaea laciniata (Kunth) B.Nord. & Pruski
- Species Senecio laciniatus Bertol. accepted as Senecio squalidus subsp. rupestris (Waldst. & Kit.) Greuter
- Species Senecio laciniatus (Sw.) DC. accepted as Odontocline laciniata (Sw.) B.Nord.
- Species Senecio lacinifolius Steud.
- Species Senecio laciniosus Wall.
- Species Senecio laciniosus Arn.
- Species Senecio laciniosus Phil. accepted as Senecio pentaphyllus Phil.
- Species Senecio lactescens Brot.
- Species Senecio lactucella Sessé & Moc. accepted as Packera bellidifolia (Kunth) W.A.Weber & Á.Löve
- Species Senecio lactucifolius S.Moore
- Species Senecio lactucinus Greene
- Species Senecio lactucoides Sch.Bip.
- Species Senecio lactucoides Klatt accepted as Erechtites albiflorus (Sch.Bip.) Hassemer & Funez
- Species Senecio lacustrinus I.Thomps.
- Species Senecio ladakhensis H.J.Chowdhery, Uniyal, R.Mathur & R.R.Rao
- Species Senecio laderoi Pérez Morales & al. accepted as Senecio doria subsp. laderoi Blanca
- Species Senecio laderoi Pérez Morales, M.E.García & Penas accepted as Senecio doria subsp. laderoi Blanca
- Species Senecio laetevirens Phil.
- Species Senecio laetiflorus Greene
- Species Senecio laetivirens V.M.Badillo accepted as Pentacalia badilloi (Cuatrec.) Cuatrec.
- Species Senecio laetus Edgew.
- Species Senecio laevicaulis DC.
- Species Senecio laevigatus Thunb.
- Species Senecio laevis Humbert
- Species Senecio lagascanus DC.
- Species Senecio lageniformis I.Thomps.
- Species Senecio laggeri Nyman
- Species Senecio lagopus Raoul accepted as Brachyglottis lagopus (Raoul) B.Nord.
- Species Senecio lagotis W.W.Sm. accepted as Ligularia virgaurea (Maxim.) Mattf. ex Rehder & Kobuski
- Species Senecio lamarckianus Bullock
- Species Senecio lamarum Diels
- Species Senecio lamarum Diels ex H.Limpr. accepted as Ligularia lamarum (Diels ex H.Limpr.) C.C.Chang
- Species Senecio lambertii Auct.
- Species Senecio lambomboensis Muschl.
- Species Senecio lamottei Rouy
- Species Senecio lampsanaefolius Baker accepted as Hubertia lapsanifolia (Baker) C.Jeffrey
- Species Senecio lampsanoides DC. accepted as Caucasalia parviflora (M.Bieb.) B.Nord.
- Species Senecio lanatifolius Osterh.
- Species Senecio lanatus L.f.
- Species Senecio lanatus L.
- Species Senecio lanatus Lec. & Lamotte
- Species Senecio lanatus Burm. ex DC.
- Species Senecio lanatus Thunb. accepted as Oresbia heterocarpa Cron & B.Nord.
- Species Senecio lanatus Scop. accepted as Senecio scopolii Hoppe & Hornsch.
- Species Senecio lanatus (Kunth) Burm. ex DC. accepted as Pentacalia ledifolia (Kunth) Cuatrec.
- Species Senecio lanceolatus Burm.f.
- Species Senecio lanceolatus Torr. & A.Gray accepted as Senecio serra var. serra Hook.
- Species Senecio lanceolatus (Lam.) Gren. accepted as Tephroseris helenitis (L.) B.Nord.
- Species Senecio lanceolifolius Cuatrec. accepted as Pentacalia lanceolifolia (Cuatrec.) Cuatrec.
- Species Senecio lanceus Aiton
- Species Senecio lanceus Ait.
- Species Senecio lancidentatus Cuatrec.
- Species Senecio lancifer J.R.Drumm.
- Species Senecio lancifolius Turcz. accepted as Senecio pellucidus DC.
- Species Senecio landbeckii Phil.
- Species Senecio langebirgensis Thell.
- Species Senecio langei Malme
- Species Senecio langlassei Greenm. accepted as Roldana langlassei (Greenm.) H.Rob. & Brettell
- Species Senecio lanibracteus I.Thomps.
- Species Senecio lanicaulis Greenm.
- Species Senecio lanifer Mart. ex C.Jeffrey
- Species Senecio lanifer Mart. ex Baker
- Species Senecio laniger Bojer ex DC.
- Species Senecio lanigerus Burm.f.
- Species Senecio lankongensis Franch. accepted as Ligularia lankongensis (Franch.) Hand.-Mazz.
- Species Senecio lanosissimus Cabrera
- Species Senecio lanuginosus Spreng.
- Species Senecio lanuginosus (Edgew.) M.R.Almeida
- Species Senecio lanuginosus Don ex Hook. & Arn.
- Species Senecio lanuginosus D.Don accepted as Senecio donianus Hook. & Arn.
- Species Senecio lanuriensis De Wild. accepted as Senecio transmarinus var. transmarinus
- Species Senecio lapathifolius Greene accepted as Senecio crassulus A.Gray
- Species Senecio lapathifolius Franch. accepted as Ligularia lapathifolia (Franch.) Hand.-Mazz.
- Species Senecio lapeyrousei Rothm. accepted as Tephroseris helenitis (L.) B.Nord.
- Species Senecio lapidosus Cheeseman accepted as Brachyglottis lapidosa (Cheeseman) B.Nord.
- Species Senecio lapidum Greenm.
- Species Senecio lapsanifolius Baker
- Species Senecio larahuinensis H.Beltrán & A.Galán
- Species Senecio laramiensis A.Nelson accepted as Packera cana (Hook.) W.A.Weber & Á.Löve
- Species Senecio larecajensis Cabrera
- Species Senecio laricifolius Kunth
- Species Senecio larranagae Phil.
- Species Senecio laseguei
- Species Senecio laseguei Hombr. & Jacquinot ex Decne.
- Species Senecio lasiocaulon T.M.Barkley
- Species Senecio lasiorhizoides Sch.Bip. ex Harv. & Sond.
- Species Senecio lasiorhizoides Sch.Bip. accepted as Senecio coronatus (Thunb.) Harv.
- Species Senecio lasiorhizus DC. accepted as Senecio coronatus (Thunb.) Harv.
- Species Senecio lastarrianus J.Rémy
- Species Senecio late-alatopetiolatus De Wild. accepted as Senecio subsessilis Oliv. & Hiern
- Species Senecio latecorymbosus Gilli
- Species Senecio lathyroides Greene accepted as Senecio flaccidus var. monoensis (Greene) B.L.Turner & T.M.Barkley
- Species Senecio latibracteatus Humbert
- Species Senecio laticipes Bruyns
- Species Senecio laticostatus Belcher accepted as Senecio glomeratus subsp. longifructus I.Thomps.
- Species Senecio latiflorus Wedd.
- Species Senecio latifolius DC.
- Species Senecio latifolius Mast.
- Species Senecio latifolius Banks & Sol. ex Hook.f. accepted as Senecio rufiglandulosis Colenso
- Species Senecio latihastatus W.W.Sm. accepted as Ligularia latihastata (W.W.Sm.) Hand.-Mazz.
- Species Senecio latiligulatus N.P.Balakr.
- Species Senecio latilobus S.Moore
- Species Senecio latipes Greenm.
- Species Senecio latipes Franch. accepted as Parasenecio latipes (Franch.) Y.L.Chen
- Species Senecio latissimifolius S.Moore
- Species Senecio latouchei Jeffrey accepted as Sinosenecio latouchei (Jeffrey) B.Nord.
- Species Senecio latronum Boiss. & Hausskn.
- Species Senecio latus Rydb. accepted as Senecio sphaerocephalus Greene
- Species Senecio laucanus Ricardi & Martic.
- Species Senecio launayaefolius O.Hoffm. accepted as Senecio paucicalyculatus Klatt
- Species Senecio launayifolius O.Hoffm.
- Species Senecio laurifolius Kunth accepted as Gynoxys laurifolia (Kunth) Cass.
- Species Senecio lautus G.Forst. ex Willd.
- Species Senecio lautus Sol. ex G.Forst.
- Species Senecio lavandulifolius Wall. ex DC.
- Species Senecio lavandulifolius Wall ex DC. accepted as Pseudojacobaea lavandulifolius (Wall. ex DC.) R.Mathur
- Species Senecio lavendulaefolius DC.
- Species Senecio lawalreeanus Lisowski
- Species Senecio lawii C.B.Clarke accepted as Senecio dalzellii C.B.Clarke
- Species Senecio lawsonii Gamble
- Species Senecio laxiflorus Viv. accepted as Senecio glaucus subsp. coronopifolius (Maire) C.Alexander
- Species Senecio laxifolius Buchanan accepted as Brachyglottis laxifolia (Buchanan) B.Nord.
- Species Senecio laxus DC.
- Species Senecio layneae Greene accepted as Packera layneae (Greene) W.A.Weber & Á.Löve
- Species Senecio lazicus Boiss. & Balansa accepted as Iranecio lazicus (Boiss. & Balansa) C.Jeffrey
- Species Senecio leandrii Humbert
- Species Senecio lebrunei H.Lév. accepted as Senecio asperifolius Franch.
- Species Senecio lechleri Sch.Bip.
- Species Senecio lechleri Phil.
- Species Senecio leclerei H.Lév. accepted as Parasenecio koualapensis (Franch.) Y.L.Chen
- Species Senecio ledebourii Sch.Bip. accepted as Ligularia macrophylla (Ledeb.) DC.
- Species Senecio ledifolius (Kunth) DC. accepted as Pentacalia ledifolia (Kunth) Cuatrec.
- Species Senecio legionensis Lange
- Species Senecio lehmannii Hieron. accepted as Pentacalia ledifolia subsp. lehmannii (Hieron.) Cuatrec.
- Species Senecio leibergii Greene accepted as Senecio integerrimus var. ochroleucus (A.Gray) Cronquist
- Species Senecio leiocarpus Dalla Torre
- Species Senecio leiocarpus DC. accepted as Senecio albanensis var. albanensis DC.
- Species Senecio leioclados Cuatrec.
- Species Senecio leiophyllus Turcz.
- Species Senecio lejolyanus Lisowski
- Species Senecio lelyi Hutch.
- Species Senecio lemberti Greene accepted as Packera pauciflora (Pursh) Á.Löve & D.Löve
- Species Senecio lemmonii A.Gray
- Species Senecio lemuricus Humbert accepted as Crassocephalum lemuricum (Humbert) Humbert
- Species Senecio lenensis Schischk.
- Species Senecio lentior (S.Moore) S.Moore accepted as Senecio eenii (S.Moore) Merxm.
- Species Senecio leonardii Rydb. accepted as Packera streptanthifolia (Greene) W.A.Weber & Á.Löve
- Species Senecio leonensis Greenm.
- Species Senecio leonis
- Species Senecio leontodontifolius Bojer ex DC.
- Species Senecio leontodontis DC.
- Species Senecio lepidosus Cheeseman
- Species Senecio leptanthus Phil. accepted as Erechtites leptanthus (Phil.) Cabrera
- Species Senecio leptocarpus DC.
- Species Senecio leptocaulos Phil.
- Species Senecio leptocephalus Mattf. accepted as Emilia leptocephala (Mattf.) C.Jeffrey
- Species Senecio leptolepis Greene accepted as Senecio aronicoides DC.
- Species Senecio leptolobus DC.
- Species Senecio leptophyllus DC.
- Species Senecio leptophyllus Hook. & Arn.
- Species Senecio leptopodus Gand.
- Species Senecio leptopterus Mesfin
- Species Senecio leptoschizus Bong.
- Species Senecio lessingianus (Wight & Arn.) C.B.Clarke
- Species Senecio lessingii Harv.
- Species Senecio lessonianus Sch.Bip.
- Species Senecio lessonianus Steud. accepted as Senecio glomeratus Desf. ex Poir.
- Species Senecio lessonii F.Muell.
- Species Senecio letouzeyanus Lisowski
- Species Senecio leucadendron Benth. & Hook.f.
- Species Senecio leucadendron (Forst.) Hemsl.
- Species Senecio leucanthemifolius Poir.
- Species Senecio leucanthemifolius Phil. accepted as Senecio santiagoensis Kuntze
- Species Senecio leucanthemoides Cuatrec.
- Species Senecio leucanthemus Dunn accepted as Parasenecio ainsliiflorus (Franch.) Y.L.Chen
- Species Senecio leucanthothamnus Humbert accepted as Hubertia leucanthothamnus (Humbert) C.Jeffrey
- Species Senecio leucanthus Greenm.
- Species Senecio leuceria Cabrera
- Species Senecio leuciscus Phil.
- Species Senecio leucocephalus Franch. accepted as Parasenecio leucocephalus (Franch.) Y.L.Chen
- Species Senecio leucocrinus Greene accepted as Packera macounii (Greene) W.A.Weber & Á.Löve
- Species Senecio leucoglossus Sond.
- Species Senecio leucoglossus F.Muell.
- Species Senecio leucolepis Greenm.
- Species Senecio leucomallus A.Gray
- Species Senecio leucomallus Phil. accepted as Senecio maulinus Reiche
- Species Senecio leucopappus Bojer ex DC.
- Species Senecio leucopappus (DC.) Bojer ex Humbert accepted as Humbertacalia leucopappa (Bojer ex DC.) C.Jeffrey
- Species Senecio leucopeplus Cabrera
- Species Senecio leucophorbius Cuatrec.
- Species Senecio leucophyllus DC. accepted as Jacobaea leucophylla (DC.) Pelser
- Species Senecio leucophyton Phil.
- Species Senecio leucoreus Greenm. accepted as Packera multilobata (Torr. & A.Gray ex A.Gray) W.A.Weber & Á.Löve
- Species Senecio leucostachys Baker
- Species Senecio leucus Phil.
- Species Senecio leveillei Vaniot accepted as Ligularia leveillei (Vaniot) Hand.-Mazz.
- Species Senecio levingei C.B.Clarke
- Species Senecio levingii C.B.Clarke
- Species Senecio lewallei Lisowski
- Species Senecio lewisrosei J.T.Howell accepted as Packera eurycephala var. lewisrosei (J.T.Howell) J.F.Bain
- Species Senecio leyboldi Phil.
- Species Senecio leyboldtii Phil.
- Species Senecio lhasaensis Ling ex C.Jeffrey & Y.L.Chen
- Species Senecio lhasaensis Y.Ling ex Y.L.Chen, S.Yun Liang & K.Y.Pan
- Species Senecio liabifolius Rusby accepted as Dendrophorbium curvidens (Sch.Bip. ex Klatt) C.Jeffrey
- Species Senecio liangshanensis C.Jeffrey & Y.L.Chen
- Species Senecio liatroides C.Winkl. accepted as Ligularia liatroides (C.Winkl.) Hand.-Mazz.
- Species Senecio libanoticus Ehrenb. ex Boiss.
- Species Senecio libertatis Cuatrec.
- Species Senecio libertatus Cuatrec.
- Species Senecio lichtensteinensis Dinter accepted as Senecio burchellii DC.
- Species Senecio liebmannii Buchinger ex Klatt
- Species Senecio liebmannii Buchinger
- Species Senecio liechtensteinensis Murr
- Species Senecio ligularia Hook.f.
- Species Senecio ligularia Hand.-Mazz.
- Species Senecio ligularioides Hand.-Mazz. accepted as Sinosenecio ligularioides (Hand.-Mazz.) B.Nord.
- Species Senecio ligulifolius Greene accepted as Packera macounii (Greene) W.A.Weber & Á.Löve
- Species Senecio lijiangensis C.Jeffrey & Y.L.Chen
- Species Senecio lilacinus Schrad.
- Species Senecio lilacinus J.Jacq. ex A.Spreng.
- Species Senecio lilloi Cabrera
- Species Senecio limbardioides Hook. & Arn. accepted as Senecio paucidentatus DC.
- Species Senecio limonius Phil. accepted as Senecio buglossus Phil.
- Species Senecio limosus Dusén ex Malme
- Species Senecio limosus Dusén
- Species Senecio limosus O.Hoffm. accepted as Emilia limosa (O.Hoffm.) C.Jeffrey
- Species Senecio limprichtii Diels
- Species Senecio limprichtii Diels ex H.Limpr. accepted as Ligularia limprichtii Hand.-Mazz.
- Species Senecio limumae Makino
- Species Senecio linaresensis Soldano
- Species Senecio linariifolius Poepp. ex DC.
- Species Senecio linariifolius Drège ex Harv. & Sond.
- Species Senecio lindenii Sch.Bip. ex Klatt
- Species Senecio lindenii Sch.Bip. ex Wedd. accepted as Pentacalia lindenii (Sch.Bip. ex Wedd.) Cuatrec.
- Species Senecio lindheimeri Greenm.
- Species Senecio lindstroemii (Ostenf.) A.E.Porsild accepted as Tephroseris lindstroemii (Ostenf.) Á.Löve & D.Löve
- Species Senecio linearifolius A.Rich.
- Species Senecio linearifolius Colla
- Species Senecio linearilobus Bong.
- Species Senecio linearilobus Hook. & Arn.
- Species Senecio linearis DC.
- Species Senecio lineatus (L.f.) DC.
- Species Senecio lineolatus DC. accepted as Roldana sinuata B.L.Turner
- Species Senecio lingianus C.Jeffrey & Y.L.Chen
- Species Senecio lingua Poir.
- Species Senecio lingulatus Franch.
- Species Senecio lingulatus (Willd. ex Schltdl.) Cuatrec.
- Species Senecio linifoliaster G.López accepted as Senecio nevadensis subsp. malacitanus (Huter) Greuter
- Species Senecio linifolius (L.) L.
- Species Senecio linifolius (DC.) C.B.Clarke
- Species Senecio linifolius Thunb.
- Species Senecio linifolius DC.
- Species Senecio linifolius Forssk.
- Species Senecio linoides DC.
- Species Senecio lipskyi accepted as Iranecio lipskyi C.Jeffrey
- Species Senecio lisowskii Long Wang & Beentje
- Species Senecio litardierei (Rouy) P.Fourn. accepted as Senecio lividus L.
- Species Senecio lithophilus Greenm.
- Species Senecio lithostaurus Cabrera
- Species Senecio lithuanicus Gand.
- Species Senecio litorosus Fourc.
- Species Senecio littoralis Gaudich.
- Species Senecio littoralis Poepp.
- Species Senecio littoralis Hombr. & Jacquinot ex Decne.
- Species Senecio littoralis Scop.
- Species Senecio littoralis Poepp. ex DC. accepted as Senecio planiflorus Kunze ex Cabrera
- Species Senecio littoralis J.Rémy accepted as Senecio vaginatus Hook. & Arn.
- Species Senecio littoreus Thunb.
- Species Senecio litvinovii Schischk. accepted as Senecio cannabifolius var. integrifolius (Koidz.) Kitam.
- Species Senecio lividovulgaris Lojac. accepted as Senecio lividus L.
- Species Senecio lividus L.
- Species Senecio lividus Sm.
- Species Senecio lividus Nolte
- Species Senecio llewelynii Cuatrec. accepted as Dendrophorbium llewelynii (Cuatrec.) H.Beltrán
- Species Senecio lloensis Hieron. ex Sodiro
- Species Senecio lloensis Hieron. accepted as Dendrophorbium lloense (Hieron. ex Sodiro) C.Jeffrey
- Species Senecio loayzanus Cabrera
- Species Senecio lobatifolius Makino
- Species Senecio lobatus Sessé & Moc.
- Species Senecio lobatus Pers. accepted as Packera glabella (Poir.) C.Jeffrey
- Species Senecio lobelioides DC.
- Species Senecio loeseneri Hieron. accepted as Senecio betonicifolius DC.
- Species Senecio loesneri Hieron. accepted as Aetheolaena loesneri (Hieron.) B.Nord.
- Species Senecio lombokensis J.Kost.
- Species Senecio lomincola Cabrera
- Species Senecio lonchophyllus Hand.-Mazz. accepted as Synotis hieraciifolia (H.Lév.) C.Jeffrey & Y.L.Chen
- Species Senecio londinensis Lousley
- Species Senecio longeligulatus H.Lév. & Vaniot accepted as Tephroseris flammea (Turcz. ex DC.) Holub
- Species Senecio longeligulatus De Wild. accepted as Dendrosenecio erici-rosenii subsp. erici-rosenii (R.E.Fr. & T.C.E.Fr.) E.B.Knox
- Species Senecio longepenicillatus Sch.Bip. ex Wedd.
- Species Senecio longepenicillatus Sch.Bip. ex Sandwith
- Species Senecio longicollaris I.Thomps.
- Species Senecio longidentatus DC.
- Species Senecio longiflorus (DC.) Sch.Bip. accepted as Kleinia longiflora DC.
- Species Senecio longifolius Labill. ex DC.
- Species Senecio longifolius P.J.Bergius
- Species Senecio longifolius (Jacq.) Dalla Torre accepted as Tephroseris longifolia (Jacq.) Griseb. & Schenk
- Species Senecio longifolius L. accepted as Senecio linifolius (L.) L.
- Species Senecio longilinguae Cuatrec.
- Species Senecio longilobus Benth. accepted as Senecio flaccidus var. flaccidus Less.
- Species Senecio longipedunculatus Dinter accepted as Senecio maydae Merxm.
- Species Senecio longipedunculatus Halácsy accepted as Senecio macedonicus Griseb.
- Species Senecio longipes Hook.f. accepted as Senecio tricuspidatus Hook. & Arn.
- Species Senecio longipes Baker accepted as Kleinia grantii (Oliv. & Hiern) Hook.f.
- Species Senecio longipetalus Sennen accepted as Senecio doronicum (L.) L.
- Species Senecio longipetiolatus Rydb. accepted as Packera streptanthifolia (Greene) W.A.Weber & Á.Löve
- Species Senecio longipilus I.Thomps.
- Species Senecio longiradiatus Trautv.
- Species Senecio longiscapus Bojer ex DC.
- Species Senecio longiscapus Bojer
- Species Senecio longistylus Greenm. & Cuatrec. accepted as Nordenstamia longistyla (Greenm. & Cuatrec.) B.Nord.
- Species Senecio looseri Cabrera
- Species Senecio lopez-guillenii Cabrera
- Species Senecio lopezii Boiss.
- Species Senecio lopez-mirandae Cabrera
- Species Senecio lophophilus Greenm. accepted as Pentacalia lophophilus (Greenm.) Cuatrec.
- Species Senecio lopollensis Hiern accepted as Emilia lopollensis (Hiern) C.Jeffrey
- Species Senecio loratifolius Greenm.
- Species Senecio lorentii Hochst. accepted as Iranecio lorentii (Hochst.) C.Jeffrey
- Species Senecio lorentziella Hicken
- Species Senecio lorentzii Griseb.
- Species Senecio lorentzii Phil. accepted as Senecio lorentziella Hicken
- Species Senecio loretensis Cuatrec. accepted as Pentacalia loretensis (Cuatrec.) Cuatrec.
- Species Senecio loureiroi Sch.Bip.
- Species Senecio lubumbashianus De Wild. accepted as Senecio purpureus L.
- Species Senecio lubumbashiensis De Wild. accepted as Senecio purpureus L.
- Species Senecio lucens (Poir.) Urb.
- Species Senecio luceria Cabrera
- Species Senecio lucidissimus Cuatrec. accepted as Pentacalia lucidissima (Cuatrec.) Cuatrec.
- Species Senecio lucidus (Sw.) DC.
- Species Senecio lucorum Franch. accepted as Synotis lucorum (Franch.) C.Jeffrey & Y.L.Chen
- Species Senecio ludens C.B.Clarke
- Species Senecio luembensis De Wild. & Muschl.
- Species Senecio lugardae Bullock accepted as Senecio hochstetteri Sch.Bip. ex A.Rich.
- Species Senecio lugardiae Bullock
- Species Senecio lugens Richardson
- Species Senecio lujae De Wild.
- Species Senecio lulioi M.G.López & Xifreda
- Species Senecio lunulatus (Chiov.) H.Jacobsen accepted as Kleinia lunulata (Chiov.) Thulin
- Species Senecio luridus Phil. accepted as Senecio rodolfoi X.Wu
- Species Senecio luridus Salisb. accepted as Senecio japonicus Thunb.
- Species Senecio lushaiensis C.E.C.Fisch. accepted as Synotis lushaensis (C.E.C.Fisch.) C.Jeffrey & Y.L.Chen
- Species Senecio lusitanicus (Cout.) Pérez-Romero accepted as Senecio lagascanus subsp. lusitanicus (Cout.) P.Silva
- Species Senecio luticola Dunn accepted as Senecio asperifolius Franch.
- Species Senecio luzoniensis Merr.
- Species Senecio lyallii Klatt accepted as Packera contermina (Greenm.) J.F.Bain
- Species Senecio lyallii Hook.f. accepted as Dolichoglottis lyallii (Hook.f.) B.Nord.
- Species Senecio lycopersicifolius Sch.Bip.
- Species Senecio lycopifolius Desf. ex Poir. accepted as Jacobaea lycopifolia (Poir.) Greuter & B.Nord.
- Species Senecio lycopodioides Schltr.
- Species Senecio lydenburgensis Hutch. & Burtt Davy
- Species Senecio lygodes Hiern accepted as Senecio inornatus DC.
- Species Senecio lynceus Greene accepted as Packera multilobata (Torr. & A.Gray ex A.Gray) W.A.Weber & Á.Löve
- Species Senecio lyonii A.Gray
- Species Senecio lyonii A.Gray ex Lyon
- Species Senecio lyratifolius Rchb.
- Species Senecio lyratipartitus Sch.Bip. ex A.Rich. accepted as Senecio lyratus Forssk.
- Species Senecio lyratus L.f.
- Species Senecio lyratus Forssk.
- Species Senecio lyratus Turcz.
- Species Senecio lyratus DC. accepted as Senecio anapetes C.Jeffrey
- Species Senecio lyratus Thunb. accepted as Senecio lyratus L.f.
- Species Senecio lyratus Michx. accepted as Packera glabella (Poir.) C.Jeffrey
- Species Senecio lythroides Wijnands accepted as Senecio nevadensis subsp. malacitanus (Huter) Greuter
- Species Senecio mabberleyi C.Jeffrey
- Species Senecio macbridei Greenm. accepted as Pentacalia reflexa (Kunth) Cuatrec.
- Species Senecio macdonaldii B.L.Turner accepted as Psacaliopsis macdonaldii (B.L.Turner) C.Jeffrey
- Species Senecio macdougalii A.Heller
- Species Senecio macdougalii accepted as Senecio eremophilus var. macdougalii Cronquist
- Species Senecio macedonicus Griseb.
- Species Senecio macer Phil. accepted as Senecio portulacoides J.Rémy
- Species Senecio macfrancisci Cuatrec.
- Species Senecio macounii Greene accepted as Packera macounii (Greene) W.A.Weber & Á.Löve
- Species Senecio macowanii Hilliard
- Species Senecio macquariensis DC.
- Species Senecio macranthus A.Rich.
- Species Senecio macranthus C.B.Clarke accepted as Ligularia japonica var. japonica
- Species Senecio macroalatus M.D.Hend. accepted as Senecio inornatus DC.
- Species Senecio macrobotrys Hemsl. accepted as Roldana oaxacana (Hemsl.) H.Rob. & Brettell
- Species Senecio macrocarpus F.Muell. ex Belcher
- Species Senecio macrocephalus DC.
- Species Senecio macrodontus DC.
- Species Senecio macroglossoides Hilliard
- Species Senecio macroglossus DC.
- Species Senecio macropappus Sch.Bip. ex A.Rich. accepted as Crassocephalum macropappus (Sch.Bip. ex A.Rich.) S.Moore
- Species Senecio macrophyllus Humb., Bonpl. & Kunth
- Species Senecio macrophyllus M.Bieb.
- Species Senecio macrophyllus E.Phillips
- Species Senecio macrophyllus Kunth accepted as Pseudogynoxys bogotensis (Spreng.) Cuatrec.
- Species Senecio macropodus DC. accepted as Senecio angulatus L.f.
- Species Senecio macropus Greenm. accepted as Packera quercetorum (Greene) C.Jeffrey
- Species Senecio macrorrhizus Wedd.
- Species Senecio macrotis Baker
- Species Senecio macrotus Kunze
- Species Senecio macrotus Kunze ex Walp.
- Species Senecio macrotus Kuntze ex Meyen accepted as Senecio glabratus Hook. & Arn.
- Species Senecio maculatus Cabrera
- Species Senecio madagascariensis Poir.
- Species Senecio madagascariensis (Humbert) H.Jacobsen
- Species Senecio madariagae Phil.
- Species Senecio maderensis DC. accepted as Pericallis aurita (L'Hér.) B.Nord.
- Species Senecio madidiensis J.Calvo & A.Fuentes
- Species Senecio madrasensis C.Jeffrey
- Species Senecio madrensis A.Gray accepted as Pericallis aurita (L'Hér.) B.Nord.
- Species Senecio maeviae Cabrera
- Species Senecio magellanensis Macloskie accepted as Senecio laseguei
- Species Senecio magellanicus Hook. & Arn.
- Species Senecio magellanicus Phil. accepted as Senecio laseguei
- Species Senecio magellensis Ten.
- Species Senecio magistri Standl. & L.O.Williams accepted as Pentacalia magistri (Standl. & L.O.Williams) H.Rob. & Cuatrec.
- Species Senecio magnicaliculatus V.M.Badillo
- Species Senecio magnicalyculatus V.M.Badillo accepted as Pentacalia magnicaliculata (V.M.Badillo) Cuatrec.
- Species Senecio magnificus F.Muell.
- Species Senecio magnusii Hieron. accepted as Pentacalia magnusii (Hieron.) Cuatrec.
- Species Senecio mahindae G.L.Nesom & Vorobik
- Species Senecio mairei H.Lév. accepted as Senecio graciliflorus (Wall.) DC.
- Species Senecio mairetianus DC.
- Species Senecio major (A.Gray) A.Heller accepted as Senecio integerrimus var. major (A.Gray) Cronquist
- Species Senecio majus A.Heller
- Species Senecio makineanus Yatabe accepted as Miricacalia makineana (Yatabe) Kitam.
- Species Senecio makinoi C.Winkl.
- Species Senecio malacitanus Huter accepted as Senecio nevadensis subsp. malacitanus (Huter) Greuter
- Species Senecio malacophyllus Dusén
- Species Senecio malaisei Hultén
- Species Senecio malaissei Lisowski
- Species Senecio maldonadensis Baker accepted as Senecio heterotrichius DC.
- Species Senecio malmstenii S.F.Blake
- Species Senecio malmstenii S.F.Blake ex Tidestr. accepted as Packera malmstenii (S.F.Blake ex Tidestr.) Kartesz
- Species Senecio malvifolius (L'Hér.) DC. accepted as Pericallis malvifolia (L'Hér.) B.Nord.
- Species Senecio mamancanacanus Cuatrec.
- Species Senecio mampodrensis Gand.
- Species Senecio mandonianus Wedd. accepted as Senecio candollii Wedd.
- Species Senecio mandraliscae (Tineo) H.Jacobsen accepted as Kleinia mandraliscae Tineo
- Species Senecio mandrarensis Humbert
- Species Senecio manengubensis Mattf.
- Species Senecio manguensis Cabrera & Zardini
- Species Senecio manitobensis Greenm.
- Species Senecio mannii Hook.f. accepted as Solanecio mannii (Hook.f.) C.Jeffrey
- Species Senecio manshuricus Kitam. accepted as Senecio ambraceus Turcz. ex DC.
- Species Senecio mapuche Cabrera
- Species Senecio maranguensis O.Hoffm.
- Species Senecio marcapatana Cuatrec.
- Species Senecio marceri Sennen
- Species Senecio marceris Sennen
- Species Senecio marcianus Urb. & Ekman
- Species Senecio margaritae C.Jeffrey
- Species Senecio margaritifer Klatt accepted as Senecio andinus H.Buek
- Species Senecio margaritiferus Klatt
- Species Senecio marginalis Hilliard
- Species Senecio marginatus Thunb.
- Species Senecio marginatus L.f.
- Species Senecio mariettae Muschl.
- Species Senecio marinii Cabrera accepted as Pentacalia marinii (Cabrera) Cuatrec.
- Species Senecio maritimus L.f.
- Species Senecio maritimus Koidz.
- Species Senecio maritimus (L.) Koidz. accepted as Senecio pseudoarnica Less.
- Species Senecio maritimus (L.) Rchb. accepted as Jacobaea maritima (L.) Pelser & Meijden
- Species Senecio marlothianus O.Hoffm. accepted as Emilia marlothiana (O.Hoffm.) C.Jeffrey
- Species Senecio marmorae Moris accepted as Senecio leucanthemifolius Poir.
- Species Senecio marnieri Humbert
- Species Senecio maroccanus P.H.Davis accepted as Jacobaea maroccana (P.H.Davis) Pelser
- Species Senecio marojejyensis Humbert
- Species Senecio marotiri C.J.Webb
- Species Senecio marquesii B.L.Turner
- Species Senecio marquezii B.L.Turner accepted as Roldana marquesii (B.L.Turner) C.Jeffrey
- Species Senecio martinensis Dusén
- Species Senecio martingrantii Cuatrec.
- Species Senecio martini Vaniot
- Species Senecio martinii Vaniot
- Species Senecio martirensis T.M.Barkley
- Species Senecio marus
- Species Senecio masafuerae (Skottsb.) Pelser
- Species Senecio masatierrae Pelser
- Species Senecio mason-halei Ruíz-Terán & López-Fig.
- Species Senecio mason-halei Ruiz
- Species Senecio masonii De Wild. accepted as Senecio lyratus Forssk.
- Species Senecio massagetovii Schischk. accepted as Iranecio massagetovii (Schischk.) C.Jeffrey
- Species Senecio massaicus (Maire) Maire
- Species Senecio massaiensis Muschl. accepted as Senecio schweinfurthii O.Hoffm.
- Species Senecio matatini Liew, Courtney, de Lange & Pelser
- Species Senecio mathewsii Wedd.
- Species Senecio matricariifolius DC.
- Species Senecio mattfeldianus Cabrera
- Species Senecio mattfeldii R.E.Fr. accepted as Senecio snowdenii Hutch.
- Species Senecio matthewsii Petrie accepted as Brachyglottis matthewsii (Petrie) B.Nord.
- Species Senecio mattirolii Chiov.
- Species Senecio maulinus Reiche
- Species Senecio mauricei Hilliard & B.L.Burtt
- Species Senecio mauritanicus Pomel accepted as Senecio leucanthemifolius subsp. mauritanicus (Pomel) Greuter
- Species Senecio mauritianus P.Willemet
- Species Senecio maximowiczii Franch. accepted as Cremanthodium ellisii var. ellisii
- Species Senecio maydae Merxm.
- Species Senecio mayurii C.E.C.Fisch.
- Species Senecio mbuluzensis Compton
- Species Senecio mearnsii De Wild. accepted as Solanecio cydoniifolius (O.Hoffm.) C.Jeffrey
- Species Senecio medicinalis Phil. accepted as Senecio oreophyton J.Rémy
- Species Senecio medius G.Don
- Species Senecio medley-woodii Hutch.
- Species Senecio medullosus Sch.Bip. ex Greenm. accepted as Dendrophorbium medullosum (Sch.Bip. ex Greenm.) C.Jeffrey
- Species Senecio medullosus Sch.Bip. accepted as Dendrophorbium medullosum (Sch.Bip. ex Greenm.) C.Jeffrey
- Species Senecio megacephalus Nutt.
- Species Senecio megaglossus F.Muell.
- Species Senecio megalanthus Y.L.Chen
- Species Senecio megalophron Fenzl ex Boiss.
- Species Senecio megamontanus Cufod. accepted as Emilia somalensis (S.Moore) C.Jeffrey
- Species Senecio megaoreinus Zardini
- Species Senecio megaphlebius Greenm. & Cuatrec. accepted as Pentacalia megaphlebia (Greenm. & Cuatrec.) Cuatrec.
- Species Senecio megaphylla
- Species Senecio megaphyllus Greenm. accepted as Jessea megaphylla (Greenm.) H.Rob. & Cuatrec.
- Species Senecio megapotamicus Spreng.
- Species Senecio megapotamicus H.Buek accepted as Senecio brasiliensis (Spreng.) Less.
- Species Senecio megapotamicus Buek accepted as Senecio brasiliensis var. tripartitus (DC.) Baker
- Species Senecio melanocalyx Cuatrec.
- Species Senecio melanocephalus Franch. accepted as Ligularia melanocephala (Franch.) Hand.-Mazz.
- Species Senecio melanolepis DC.
- Species Senecio melanophyllus Muschl. accepted as Senecio schweinfurthii O.Hoffm.
- Species Senecio melanopotamicus Cabrera
- Species Senecio melastomatifolius Baker
- Species Senecio melastomifolius Baker
- Species Senecio melloi Cabrera accepted as Senecio subnemoralis Dusén
- Species Senecio membranifolius DC. accepted as Senecio repandus Thunb.
- Species Senecio memmingeri Britton
- Species Senecio memmingeri Britton ex Small accepted as Packera millefolium (Torr. & A.Gray) W.A.Weber & Á.Löve
- Species Senecio mendocinensis A.Gray accepted as Senecio integerrimus var. major (A.Gray) Cronquist
- Species Senecio mendocinus Phil. accepted as Senecio subulatus var. subulatus
- Species Senecio menesesiae J.Calvo
- Species Senecio merceris Sennen
- Species Senecio merendonensis Ant.Molina
- Species Senecio meridanus Cuatrec.
- Species Senecio meridensis Sch.Bip.
- Species Senecio meruensis Cotton & Blakelock accepted as Dendrosenecio meruensis (Cotton & Blakelock) E.B.Knox
- Species Senecio mesadenia Greene
- Species Senecio mesembryanthemoides Bojer ex DC.
- Species Senecio mesembrynus Cabrera
- Species Senecio mesogrammoides O.Hoffm.
- Species Senecio metallicorum (S.Moore) S.Moore accepted as Senecio polyodon var. polyodon DC.
- Species Senecio metcalfei Greene ex Wooton & Standl. accepted as Packera neomexicana var. mutabilis (Greene) W.A.Weber & Á.Löve
- Species Senecio metcalfei Greene accepted as Packera neomexicana var. mutabilis (Greene) W.A.Weber & Á.Löve
- Species Senecio metepecus B.L.Turner accepted as Roldana metepecus (B.L.Turner) C.Jeffrey
- Species Senecio meuselii Rauh
- Species Senecio mexicanus McVaugh
- Species Senecio meyenii Phil.
- Species Senecio meyeri Regel
- Species Senecio meyeri-johannis Engl.
- Species Senecio mezquitalanus B.L.Turner accepted as Roldana mezquitalana (B.L.Turner) Funston
- Species Senecio micaniiformis Steud.
- Species Senecio michoacanus (B.L.Rob.) B.L.Turner & T.M.Barkley
- Species Senecio micranthus Hornem.
- Species Senecio microalatus C.Jeffrey
- Species Senecio microbasis I.Thomps.
- Species Senecio microcephalus Phil.
- Species Senecio microchaeta Wedd.
- Species Senecio microchaete Wedd. accepted as Pentacalia corymbosa (Benth.) Cuatrec.
- Species Senecio microdon Wedd. accepted as Pentacalia microdon (Wedd.) Cuatrec.
- Species Senecio microdontus (A.Gray) A.Heller
- Species Senecio microdontus Baker accepted as Senecio andinus H.Buek
- Species Senecio microdontus Bureau & Franch. accepted as Ligularia sagitta (Maxim.) Mattf. ex Rehder & Kobuski
- Species Senecio microglossus DC.
- Species Senecio microglossus Schur
- Species Senecio micropachyphyllus Cuatrec.
- Species Senecio microphyllus Phil.
- Species Senecio microphyllus Spreng.
- Species Senecio micropifolius DC.
- Species Senecio microspermus DC.
- Species Senecio microtis Phil.
- Species Senecio miguelii Cuatrec. accepted as Pentacalia miguelii (Cuatrec.) Cuatrec.
- Species Senecio mikaniae DC. accepted as Senecio deltoideus Less.
- Species Senecio mikaniifolius (DC.) Sch.Bip. accepted as Paracalia jungioides (Hook. & Arn.) Cuatrec.
- Species Senecio mikaniiformis DC. accepted as Senecio deltoideus Less.
- Species Senecio mikanioides Otto
- Species Senecio mikanioides Otto ex Harv. accepted as Delairea odorata Lem.
- Species Senecio mikanioides Otto ex Walp. accepted as Delairea odorata Lem.
- Species Senecio milanjianus S.Moore
- Species Senecio milanjiensis S.Moore
- Species Senecio mildbraedii Muschl.
- Species Senecio milleflorus H.Lév. accepted as Senecio liangshanensis C.Jeffrey & Y.L.Chen
- Species Senecio milleflorus Greene accepted as Senecio atratus Greene
- Species Senecio millefolium Torr. & A.Gray accepted as Packera millefolium (Torr. & A.Gray) W.A.Weber & Á.Löve
- Species Senecio millei Greenm. accepted as Pentacalia millei (Greenm.) Cuatrec.
- Species Senecio millelobatus Rydb.
- Species Senecio millikenii Eastw. accepted as Senecio serra var. serra Hook.
- Species Senecio mimetes Hutch. & R.A.Dyer
- Species Senecio mindoroensis Elmer accepted as Gynura procumbens (Lour.) Merr.
- Species Senecio minesinus Cuatrec.
- Species Senecio miniatus (Welw.) Staner accepted as Gynura pseudochina (L.) DC.
- Species Senecio miniauritus Sagást. & M.O.Dillon
- Species Senecio minimus Poir. accepted as Erechtites minima (Poir.) DC.
- Species Senecio minutifolius Phil.
- Species Senecio minutus (Cav.) DC. accepted as Jacobaea minuta (Cav.) Pelser & Veldkamp
- Species Senecio mirabilis Muschl. accepted as Solanecio mirabilis (Muschl.) C.Jeffrey
- Species Senecio mirus Klatt
- Species Senecio miser Hook.f.
- Species Senecio mishmi C.B.Clarke
- Species Senecio missionum Cabrera accepted as Senecio pluricephalus Cabrera
- Species Senecio mississipianus DC. accepted as Packera glabella (Poir.) C.Jeffrey
- Species Senecio mitonis Cuatrec.
- Species Senecio mitophyllus C.Jeffrey
- Species Senecio mixtus A.Rich.
- Species Senecio mlilwanensis Compton
- Species Senecio moaensis Alain
- Species Senecio mochensis Hieron.
- Species Senecio modestus Wedd.
- Species Senecio modestus Phil. accepted as Senecio werdermannii Greenm.
- Species Senecio moelleri Phil. accepted as Senecio glaber Less.
- Species Senecio mogollonicus Greene accepted as Senecio actinella Greene
- Species Senecio mogrere P.Royen accepted as Papuacalia mogrere (P.Royen) Veldkamp
- Species Senecio mohavensis A.Gray
- Species Senecio mohinorensis Greenm.
- Species Senecio moisoni H.Lév.
- Species Senecio moisonii H.Lév. accepted as Ligularia nelumbifolia (Bureau & Franch.) Hand.-Mazz.
- Species Senecio mojandensis Hieron.
- Species Senecio moldenkei Greenm. ex Greenm. & Alain
- Species Senecio molinae Phil.
- Species Senecio molinarius Greenm. accepted as Packera werneriifolia (A.Gray) W.A.Weber & Á.Löve
- Species Senecio mollendoensis Cabrera
- Species Senecio molleri Phil.
- Species Senecio mollis Willd. & Rech.f.
- Species Senecio mollis Willd. accepted as Jacobaea mollis (Willd.) B.Nord.
- Species Senecio mollis Poepp. ex DC. accepted as Senecio sinuatilobus DC.
- Species Senecio moluccanus Roxb. accepted as Gynura bicolor (Roxb. ex Willd.) DC.
- Species Senecio momordicifolius Dinter & Muschl. ex Dinter accepted as Cineraria canescens J.C.Wendl. ex Link
- Species Senecio monanthos Diels
- Species Senecio monanthus Diels
- Species Senecio monbeigii H.Lév. accepted as Ligularia tongolensis (Franch.) Hand.-Mazz.
- Species Senecio mongolicus (Turcz.) Sch.Bip. accepted as Ligularia mongolica (Turcz.) DC.
- Species Senecio monocephalus Schur
- Species Senecio monocephalus Baker accepted as Senecio baronii Humbert
- Species Senecio monoensis Greene accepted as Senecio flaccidus var. monoensis (Greene) B.L.Turner & T.M.Barkley
- Species Senecio monroi Hook.f. accepted as Brachyglottis monroi (Hook.f.) B.Nord.
- Species Senecio montanus Lam.
- Species Senecio montanus Willd.
- Species Senecio montanus Hoppe ex Nyman
- Species Senecio montanus E.Phillips
- Species Senecio montanus L.
- Species Senecio montanus Druce
- Species Senecio montereyanus S.Watson
- Species Senecio montevidensis (Spreng.) Baker
- Species Senecio monticola DC.
- Species Senecio monticola Phil. accepted as Senecio oreinus Cabrera
- Species Senecio montidorsensis L.O.Williams accepted as Telanthophora bartlettii H.Rob. & Brettell
- Species Senecio monttianus J.Rémy
- Species Senecio montuosus S.Moore accepted as Crassocephalum montuosum (S.Moore) Milne-Redh.
- Species Senecio mooreanus Hutch. & Burtt Davy
- Species Senecio moorei R.E.Fr.
- Species Senecio mooreioides C.Jeffrey
- Species Senecio moqueguensis Montesinos
- Species Senecio moranii T.M.Barkley
- Species Senecio morazensis Greenm. accepted as Pentacalia morazensis (Greenm.) H.Rob. & Cuatrec.
- Species Senecio morelensis Miranda accepted as Senecio praecox var. morelensis (Miranda) McVaugh
- Species Senecio moreliae Hemsl. accepted as Psacalium laxiflorum Benth.
- Species Senecio morenonis Kuntze accepted as Senecio sericeo-nitens Speg.
- Species Senecio moresbiensis (Calder & Roy L.Taylor) G.W.Douglas & Ruyle-Dougl. accepted as Packera subnuda var. moresbiensis Trock
- Species Senecio moresbiensis (Calder & Roy L.Taylor) G.W.Douglas & Ruyle-Dougla accepted as Packera subnuda var. moresbiensis Trock
- Species Senecio morettii H.Buek
- Species Senecio morisii J.Calvo & Bacch.
- Species Senecio moritzianus Klatt accepted as Pseudogynoxys bogotensis (Spreng.) Cuatrec.
- Species Senecio morotonensis C.Jeffrey
- Species Senecio morrensis Hieron. accepted as Senecio laricifolius Kunth
- Species Senecio morrisonensis Hayata
- Species Senecio morrumbalaensis De Wild. accepted as Solanecio mannii (Hook.f.) C.Jeffrey
- Species Senecio mortonii C.B.Clarke
- Species Senecio moscopanus Cuatrec. accepted as Dendrophorbium moscopanum (Cuatrec.) C.Jeffrey
- Species Senecio mosoynensis Franch. accepted as Ligularia kanaitzensis var. kanaitzensis
- Species Senecio motelayi Rouy
- Species Senecio moupinensis (Franch.) Chang accepted as Parasenecio palmatisectus var. moupinensis (Franch.) Y.L.Chen
- Species Senecio mouterdei Arènes accepted as Jacobaea mouterdei (Arènes) Greuter & B.Nord.
- Species Senecio mucronatus (Thunb.) Willd.
- Species Senecio mucronulatus (Sch.Bip.) Sch.Bip. accepted as Senecio purpureus L.
- Species Senecio mucuyanus Cuatrec. accepted as Pentacalia venezuelensis (Sandwith) Cuatrec.
- Species Senecio muehlenbergii Sch.Bip. accepted as Arnoglossum reniforme (Hook.) H.Rob.
- Species Senecio muelleri Regel
- Species Senecio muelleri Kirk accepted as Brachyglottis stewartiae (J.B.Armstr.) B.Nord.
- Species Senecio muirii L.Bolus
- Species Senecio muirii Greenm. accepted as Packera werneriifolia (A.Gray) W.A.Weber & Á.Löve
- Species Senecio mulgediifolius S.Schauer
- Species Senecio muliensis C.Jeffrey & Y.L.Chen
- Species Senecio multangularis Tausch
- Species Senecio multibracteatus Harv.
- Species Senecio multibracteatus Baker accepted as Senecio pleistophyllus C.Jeffrey
- Species Senecio multibracteatus Phil. accepted as Senecio polygaloides Phil.
- Species Senecio multibracteolatus C.Jeffrey & Y.L.Chen
- Species Senecio multicapitatus Greenm.
- Species Senecio multicapitatus Greenm. ex Rydb. accepted as Senecio spartioides Torr. & A.Gray
- Species Senecio multicaulis DC.
- Species Senecio multicaulis A.Rich.
- Species Senecio multicaulis Poepp. accepted as Senecio subumbellatus Phil.
- Species Senecio multiceps N.P.Balakr.
- Species Senecio multicorymbosus Klatt accepted as Solanecio mannii (Hook.f.) C.Jeffrey
- Species Senecio multidentatus Sch.Bip. ex Hemsl.
- Species Senecio multidenticulatus Humbert
- Species Senecio multifidus domb. ex DC.
- Species Senecio multifidus Willd. accepted as Senecio tenuifolius Burm.f.
- Species Senecio multiflorus Sch.Bip.
- Species Senecio multiflorus (L'Hér.) DC.
- Species Senecio multiflorus DC. accepted as Pericallis multiflora (L'Hér.) B.Nord.
- Species Senecio multifoliosus Klatt
- Species Senecio multifolius
- Species Senecio multilobatus Torr. & A.Gray ex A.Gray accepted as Packera multilobata (Torr. & A.Gray ex A.Gray) W.A.Weber & Á.Löve
- Species Senecio multilobus C.C.Chang
- Species Senecio multilobus Chang
- Species Senecio multinerve Colenso accepted as Brachyglottis perdicioides (Hook.f.) B.Nord.
- Species Senecio multinervis Sch.Bip. ex Klatt
- Species Senecio multinervis Colenso
- Species Senecio multinervis Sch.Bip.
- Species Senecio multinervis Sch.Bip. ex Rusby accepted as Dendrophorbium ayopayense (Cuatrec.) D.J.N.Hind
- Species Senecio multivenius Benth.
- Species Senecio multivenius Benth.
- Species Senecio multnomensis Greenm. accepted as Packera paupercula (Michx.) Á.Löve & D.Löve
- Species Senecio muninensis Koidz.
- Species Senecio munitus Wallr.
- Species Senecio munnozii Cabrera
- Species Senecio munozii Cabrera
- Species Senecio munzurdaglarensis Yıld.
- Species Senecio muricatus Thunb.
- Species Senecio murinus Phil.
- Species Senecio murorum J.Rémy
- Species Senecio murrayanus Wawra
- Species Senecio murrayi Bornm. accepted as Pericallis murrayi (Bornm.) B.Nord.
- Species Senecio musiniensis S.L.Welsh accepted as Packera musiniensis (S.L.Welsh) Trock
- Species Senecio mustersi Speg.
- Species Senecio mutabilis Greene accepted as Packera neomexicana var. mutabilis (Greene) W.A.Weber & Á.Löve
- Species Senecio mutisii Cuatrec. accepted as Pentacalia arbutifolia (Kunth) Cuatrec.
- Species Senecio mweroensis Baker accepted as Kleinia mweroensis (Baker) C.Jeffrey
- Species Senecio myosotidifolius Benth. accepted as Millotia myosotidifolia (Benth.) Steetz
- Species Senecio myrianthos Cheeseman accepted as Brachyglottis myrianthos (Cheeseman) D.G.Drury
- Species Senecio myrianthus Klatt accepted as Dendrophorbium cabrerae (Cuatrec.) C.Jeffrey
- Species Senecio myricaefolius (Bojer ex DC.)
- Species Senecio myricifolius Humbert
- Species Senecio myriocephalus Sch.Bip. ex A.Rich.
- Species Senecio myriocephalus Sch.Bip. ex Delile
- Species Senecio myriocephalus Sch.Bip.ex A. Rich.
- Species Senecio myriocephalus Y.Ling ex Y.L.Chen, S.Yun Liang & K.Y.Pan
- Species Senecio myriocephalus Ling accepted as Senecio lingianus C.Jeffrey & Y.L.Chen
- Species Senecio myriocephalus Baker accepted as Senecio pluricephalus Cabrera
- Species Senecio myriophyllus Phil.
- Species Senecio myrrhifolius Thunb. accepted as Senecio arenarius Thunb.
- Species Senecio myrsinites Turcz. accepted as Pentacalia myrsinites (Turcz.) Cuatrec.
- Species Senecio myrtifolius Klatt accepted as Hubertia myrtifolia (Klatt) C.Jeffrey
- Species Senecio nagensium C.B.Clarke
- Species Senecio nahuelbatae Phil.
- Species Senecio nahuelbutanus Phil. accepted as Senecio angustissimus Phil.
- Species Senecio namaquanus Bolus accepted as Senecio cinerascens Aiton
- Species Senecio namnaoensis H.Koyama
- Species Senecio nandensis S.Moore accepted as Solanecio nandensis (S.Moore) C.Jeffrey
- Species Senecio nanus Sch.Bip. ex A.Rich.
- Species Senecio napaeifolius (DC.) Sch.Bip.
- Species Senecio napeaefolius (DC.) Sch.Bip. accepted as Digitacalia napeifolia (DC.) Pippen
- Species Senecio napeaefolius (DC.) Hemsl. accepted as Digitacalia napeifolia (DC.) Pippen
- Species Senecio napellifolius Schauer
- Species Senecio napellifolius Hemsl.
- Species Senecio napifolius MacOwan
- Species Senecio napifolius Schrad. ex Rchb.
- Species Senecio narinyonis Cuatrec.
- Species Senecio narynensis C.Winkl. accepted as Ligularia narynensis (C.Winkl.) O.Fedtsch. & B.Fedtsch.
- Species Senecio natalensis (Sch.Bip.) Sch.Bip. accepted as Senecio brachypodus DC.
- Species Senecio natalicola Hilliard
- Species Senecio navarri Phil. accepted as Senecio pentaphyllus Phil.
- Species Senecio navicularis Humbert
- Species Senecio navugabensis C.Jeffrey
- Species Senecio neaei DC.
- Species Senecio neapolitanus Evers
- Species Senecio nebrodensis DC.
- Species Senecio nebrodensis Gilib. ex Georgi
- Species Senecio nebrodensis L. accepted as Senecio duriaei J.Gay
- Species Senecio neeanus Cuatrec. accepted as Culcitium neaei (DC.) Sch.Bip. ex Wedd.
- Species Senecio neelgherryanus DC.
- Species Senecio neglectus Desv.
- Species Senecio neglectus A.Rich. accepted as Senecio lautus G.Forst. ex Willd.
- Species Senecio nelsonii Rydb. ex A.Nelson
- Species Senecio nelsonii Rydb. accepted as Packera fendleri (A.Gray) W.A.Weber & Á.Löve
- Species Senecio nelumbifolius Bureau & Franch. accepted as Ligularia nelumbifolia (Bureau & Franch.) Hand.-Mazz.
- Species Senecio nemiae
- Species Senecio nemophilus Dumort.
- Species Senecio nemoralis Dusén
- Species Senecio nemorensis L.
- Species Senecio nemorensis Lorey & Duret
- Species Senecio nemorosus Jord. accepted as Jacobaea vulgaris Gaertn.
- Species Senecio neoalleizettei Humbert accepted as Humbertacalia neoalleizettei (Humbert) C.Jeffrey
- Species Senecio neoascendens Cuatrec. accepted as Senecio lingulatus (Willd. ex Schltdl.) Cuatrec.
- Species Senecio neobakeri Humbert
- Species Senecio neodendroides Cuatrec.
- Species Senecio neodenticulatus Cuatrec.
- Species Senecio neogibsonii B.L.Turner accepted as Roldana neogibsonii (B.L.Turner) B.L.Turner
- Species Senecio neoglandulosus Cuatrec.
- Species Senecio neoheimii Humbert accepted as Hubertia neoheimii (Humbert) C.Jeffrey
- Species Senecio neohumbertii G.D.Rowley
- Species Senecio neohumilis Cuatrec.
- Species Senecio neomexicanus A.Gray accepted as Packera neomexicana var. neomexicana (A.Gray) W.A.Weber & Á.Löve
- Species Senecio neophlogetus Franch. accepted as Cremanthodium thomsonii C.B.Clarke
- Species Senecio neosessilis Cuatrec. accepted as Senecio culcitenellus Cuatrec.
- Species Senecio neoviscidulus Soldano
- Species Senecio neoviscosus Cuatrec.
- Species Senecio neovolubilis Cuatrec. accepted as Pseudogynoxys scabra (Benth.) Cuatrec.
- Species Senecio neowebsteri S.F.Blake
- Species Senecio neozeylandicus Druce accepted as Brachyglottis kirkii (Hook.f. ex Kirk) C.J.Webb
- Species Senecio nepalensis Sch.Bip.
- Species Senecio nephelagetus Franch.
- Species Senecio nephrophyllus Rydb. accepted as Packera debilis (Nutt.) W.A.Weber & Á.Löve
- Species Senecio neriifolius Baill.
- Species Senecio nervatus Rchb. ex Spreng.
- Species Senecio nesomiorum B.L.Turner
- Species Senecio neuquensis Cabrera accepted as Senecio triodon Phil.
- Species Senecio nevadensis Boiss. & Reut.
- Species Senecio nevadensis Sch.Bip.
- Species Senecio nevadensis Sch.Bip. ex Wedd. accepted as Senecio longepenicillatus Sch.Bip. ex Sandwith
- Species Senecio newcombei Greene accepted as Tephroseris newcombei (Greene) B.Nord. & Pelser
- Species Senecio ngoyanus Hilliard
- Species Senecio niederleinii Cabrera
- Species Senecio nigellus V.M.Badillo accepted as Pentacalia freemanii (Britton & Greenm.) Cuatrec.
- Species Senecio nigrapicus I.Thomps.
- Species Senecio nigrescens Hook. & Arn.
- Species Senecio nigrescens Muschl.
- Species Senecio nigrocinctus Franch.
- Species Senecio nigrostagnosus Cuatrec. accepted as Pentacalia nigrostagnosa (Cuatrec.) Cuatrec.
- Species Senecio nikoensis Miq.
- Species Senecio nilagerensis Sch.Bip. ex Hook.f.
- Species Senecio nilgheryanus Hook.f.
- Species Senecio nimborum Franch. accepted as Ligularia hookeri (C.B.Clarke) Hand.-Mazz.
- Species Senecio nitidus Mérat
- Species Senecio nitidus Less. ex Harv. & Sond.
- Species Senecio nitidus (Kunth) DC. accepted as Pentacalia nitida (Kunth) Cuatrec.
- Species Senecio nitidus Phil. accepted as Senecio lastarrianus J.Rémy
- Species Senecio nitidus Kunth accepted as Pentacalia nitida (Kunth) Cuatrec.
- Species Senecio nivalis (Kunth) Cuatrec.
- Species Senecio niveo-aureus Cuatrec.
- Species Senecio niveoplanus I.Thomps.
- Species Senecio niveus (Thunb.) Willd.
- Species Senecio niveus Wall.
- Species Senecio nobilis Franch. accepted as Cremanthodium nobile (Franch.) Diels ex H.Lév.
- Species Senecio nodiflorus C.C.Chang
- Species Senecio nodiflorus Chang
- Species Senecio noeanus Rupr. accepted as Senecio glaucus subsp. coronopifolius (Maire) C.Alexander
- Species Senecio nogalensis Chiov. accepted as Kleinia nogalensis (Chiov.) Thulin
- Species Senecio nordenskjoldii O.Hoffm.
- Species Senecio nordenskjoldii O.Hoffm. ex Dusén
- Species Senecio nordenskjöldii O.Hoffm.
- Species Senecio noricus Flatscher, Schneew. & Schönsw.
- Species Senecio notonioides (S.Moore) Zonn. accepted as Kleinia abyssinica var. hildebrandtii (Vatke) C.Jeffrey
- Species Senecio novenlepis Hieron. accepted as Pentacalia teretifolia (Kunth) Cuatrec.
- Species Senecio novolanatus Cuatrec. accepted as Pentacalia novolanata (Cuatrec.) Cuatrec.
- Species Senecio nubigenus Kunth accepted as Dorobaea pimpinellifolia (Kunth) B.Nord.
- Species Senecio nubivagus L.O.Williams
- Species Senecio nublensis Soldano
- Species Senecio nudibasis H.Lév. & Vaniot accepted as Gynura nepalensis DC.
- Species Senecio nudicaulis Buch.-Ham. ex D.Don
- Species Senecio nudicaulis Sch.Bip.
- Species Senecio nudicaulis Buch.-Ham. ex C.B.Clarke
- Species Senecio nudiusculus DC.
- Species Senecio nuraniae Roldugin
- Species Senecio nutans Sch.Bip.
- Species Senecio nutans Sch.Bip. ex Wedd.
- Species Senecio nuttallii Sch.Bip. accepted as Arnoglossum plantagineum Raf.
- Species Senecio nyikensis Baker accepted as Kleinia abyssinica var. abyssinica
- Species Senecio nyungwensis Maquet accepted as Senecio rugegensis Muschl.
- Species Senecio oaxacanus Hemsl.
- Species Senecio oberprieleri G.H.Loos
- Species Senecio obesus Klatt
- Species Senecio oblanceolatus Rusby accepted as Dendrophorbium medullosum (Sch.Bip. ex Greenm.) C.Jeffrey
- Species Senecio oblanceolatus Rydb. accepted as Packera tridenticulata (Rydb.) W.A.Weber & Á.Löve
- Species Senecio obliquus Dulac
- Species Senecio oblongatus (C.B.Clarke) Franch. accepted as Cremanthodium oblongatum C.B.Clarke
- Species Senecio oblongifolius Steud.
- Species Senecio obovatus Muhl. ex Willd.
- Species Senecio obovatus Arv.-Touv.
- Species Senecio obscurus Fisch. ex Ledeb.
- Species Senecio obscurus Turcz.
- Species Senecio obtectus Kuntze
- Species Senecio obtectus O. K.
- Species Senecio obtusatus Wall. ex DC.
- Species Senecio obtusatus Wall.
- Species Senecio obtusatus Banks ex Pursh
- Species Senecio ocanensis Cuatrec.
- Species Senecio ocanensis Greenm. & Cuatrec.
- Species Senecio occidentalis (A.Gray) Greene accepted as Senecio fremontii var. occidentalis A.Gray
- Species Senecio occidentalis (A.Gray) Rydb. accepted as Senecio fremontii var. occidentalis A.Gray
- Species Senecio ochoanus Cuatrec.
- Species Senecio ochraceus (Piper) Piper accepted as Senecio integerrimus var. ochroleucus (A.Gray) Cronquist
- Species Senecio ochrocarpoides Cufod. accepted as Senecio subsessilis Oliv. & Hiern
- Species Senecio ochrocarpus Oliv. & Hiern
- Species Senecio ochroleucus Phil.
- Species Senecio ochroleucus Hook. & Arn. accepted as Senecio fistulosus Poepp. ex Less.
- Species Senecio oclonetus Phil.
- Species Senecio octobracteatus B.L.Turner & T.M.Barkley accepted as Roldana pennellii H.Rob. & Brettell
- Species Senecio octoglossus DC. accepted as Senecio nemorensis L.
- Species Senecio octolepis Griseb.
- Species Senecio octophyllus Sch.Bip. ex Rusby
- Species Senecio octophyllus Sch.Bip. & Rusby
- Species Senecio octophyllus Sch.Bip. accepted as Senecio octophyllus Sch.Bip. ex Rusby
- Species Senecio odonellii Cabrera
- Species Senecio odontophyllus C.Jeffrey
- Species Senecio odontopterus DC.
- Species Senecio odoratus Hornem.
- Species Senecio odoratus A.Rich.
- Species Senecio odoratus Hook.f. accepted as Senecio banksii Hook.f.
- Species Senecio odorus Deflers
- Species Senecio odorus (Forssk.) Defl. accepted as Kleinia odora (Forssk.) DC.
- Species Senecio odorus (Forssk.) Sch.Bip. accepted as Kleinia odora (Forssk.) DC.
- Species Senecio oederiifolius DC.
- Species Senecio oehleri Muschl. ex Jaeger
- Species Senecio oenequifolius Larrañaga
- Species Senecio oerstedianus Benth.
- Species Senecio oerstedtii Kuntze
- Species Senecio oflasii Yıld. & Kılıç
- Species Senecio ogilviae Humbert accepted as Senecio acetosifolius Baker
- Species Senecio ogotorukensis Packer accepted as Packera ogotorukensis (Packer) Á.Löve & D.Löve
- Species Senecio okopanus Cabrera
- Species Senecio oldfieldii I.Thomps.
- Species Senecio oldhamianus Maxim.
- Species Senecio oleifolius Sch.Bip. ex Baker
- Species Senecio oleosus Vell.
- Species Senecio oleraceus Crevost & Lemarie
- Species Senecio olgae Regel & Schmalh.
- Species Senecio oliganthus Spreng.
- Species Senecio oliganthus Franch.
- Species Senecio oliganthus DC. accepted as Senecio pauciflosculosus C.Jeffrey
- Species Senecio oligocephalus DC.
- Species Senecio oligodon Gand.
- Species Senecio oligolepis Boiss.
- Species Senecio oligoleucus Baker
- Species Senecio oligolobus S.Moore
- Species Senecio oligophyllus Baker
- Species Senecio olivaceobracteatus Ricardi & Martic.
- Species Senecio olivaceus Phil. accepted as Senecio paucidentatus DC.
- Species Senecio olivaceus Klatt accepted as Senecio rosellatus var. olivaceus (Klatt) Humbert
- Species Senecio olympicus Boiss.
- Species Senecio ombrophyllus Skottsb.
- Species Senecio ommanei (S.Moore) S.Moore accepted as Senecio inornatus DC.
- Species Senecio ommannei S.Moore
- Species Senecio onae Cuatrec. accepted as Pentacalia onae (Cuatrec.) Cuatrec.
- Species Senecio oodes Rydb. accepted as Packera streptanthifolia (Greene) W.A.Weber & Á.Löve
- Species Senecio oophyllus C.Jeffrey
- Species Senecio oporinus Willd.
- Species Senecio oppositicordius Cuatrec.
- Species Senecio opuntiifolius DC.
- Species Senecio orarius J.M.Black
- Species Senecio orbicularis Sond.
- Species Senecio orbicularis Sond. ex Harv. accepted as Senecio oxyriifolius DC.
- Species Senecio orcuttii Greenm.
- Species Senecio oreganus Howell accepted as Senecio hydrophiloides Rydb.
- Species Senecio oreinus Cabrera
- Species Senecio oreophilus Dusén
- Species Senecio oreophilus Greenm. accepted as Packera neomexicana var. neomexicana (A.Gray) W.A.Weber & Á.Löve
- Species Senecio oreophilus Muschl. ex Dinter accepted as Anisopappus pinnatifidus (Klatt) O.Hoffm. ex Hutch.
- Species Senecio oreophyton J.Rémy
- Species Senecio oreopolus Greenm. accepted as Packera cana (Hook.) W.A.Weber & Á.Löve
- Species Senecio oresbius Gremman
- Species Senecio oresbius Greenm. accepted as Packera neomexicana var. neomexicana (A.Gray) W.A.Weber & Á.Löve
- Species Senecio organensis Casar.
- Species Senecio orientalis Ten.
- Species Senecio orientalis Friv. ex Griseb.
- Species Senecio orientalis Pacho
- Species Senecio orientalis Mill.
- Species Senecio orientalis Willd. accepted as Senecio pseudoorientalis Schischk.
- Species Senecio orizabensis Sch.Bip. ex Hemsl.
- Species Senecio ornatus S.Moore
- Species Senecio orogenes L.O.Williams accepted as Roldana schaffneri (Sch.Bip. ex Klatt) H.Rob. & Brettell
- Species Senecio oronocensis DC. accepted as Pentacalia oronocensis (DC.) Cuatrec.
- Species Senecio orotrephes W.W.Sm. accepted as Ligularia atroviolacea (Franch.) Hand.-Mazz.
- Species Senecio orthophyllus Greene
- Species Senecio oryzetorum Diels
- Species Senecio ostenfeldii Druce
- Species Senecio ostenii Mattf.
- Species Senecio otaeguianus Phil.
- Species Senecio othannae
- Species Senecio othonnae M.Bieb. accepted as Jacobaea othonnae (M.Bieb.) C.A.Mey.
- Species Senecio othonnaeoides A.Cunn. ex DC.
- Species Senecio othonniflorus DC.
- Species Senecio othonniformis Fourc. accepted as Senecio ruwenzoriensis S.Moore
- Species Senecio otiphyllus A.Cunn. ex DC.
- Species Senecio otites Kunze ex DC.
- Species Senecio otophorus Phil. accepted as Senecio otites Kunze ex DC.
- Species Senecio otophorus Wedd.
- Species Senecio otophorus Maxim. accepted as Senecio cannabifolius var. integrifolius (Koidz.) Kitam.
- Species Senecio otopterus Griseb.
- Species Senecio ottoensis P.Royen accepted as Papuacalia ottoensis (P.Royen) Veldkamp
- Species Senecio otuscensis Cabrera
- Species Senecio ovalifolius Turcz.
- Species Senecio ovalis Sch.Bip.
- Species Senecio ovatifolius Boiss. accepted as Senecio oophyllus C.Jeffrey
- Species Senecio ovatifolius Sch.Bip. accepted as Senecio sessilifolius (Hook. & Arn.) Hemsl.
- Species Senecio ovatus (G.Gaertn., B.Mey. & Scherb.) Willd.
- Species Senecio ovatus (G.Gaertn., B.Mey. & Scherb.) Hoppe accepted as Senecio ovatus (G.Gaertn., B.Mey. & Scherb.) Willd.
- Species Senecio ovatus (Walter) MacMill. accepted as Arnoglossum ovatum (Walter) H.Rob.
- Species Senecio ovinus Greene accepted as Packera subnuda var. subnuda
- Species Senecio ovirensis DC. accepted as Tephroseris longifolia (Jacq.) Griseb. & Schenk
- Species Senecio ovoideus (Compton) H.Jacobsen
- Species Senecio ovoideus (Compton) Jacobscn
- Species Senecio ovopedatus Cuatrec. accepted as Chersodoma ovopedata (Cuatrec.) Cuatrec.
- Species Senecio oxydon Phil. accepted as Chersodoma candida Phil.
- Species Senecio oxyodon Phil. accepted as Chersodoma candida Phil.
- Species Senecio oxyodontus DC.
- Species Senecio oxyphyllus DC.
- Species Senecio oxyriifolius DC.
- Species Senecio oyensis Hepp
- Species Senecio ozolotepecanus B.L.Turner
- Species Senecio paarlensis DC.
- Species Senecio paberensis Franch. accepted as Cremanthodium ellisii var. ellisii
- Species Senecio pachycarpus C.B.Clarke ex Hook.f. accepted as Ligularia pachycarpa (C.B.Clarke ex Hook.f.) Kitam.
- Species Senecio pachylepis Greenm.
- Species Senecio pachyphyllos J.Rémy
- Species Senecio pachyphyllus Cheeseman accepted as Brachyglottis adamsii (Cheeseman) B.Nord.
- Species Senecio pachypodus Greenm.
- Species Senecio pachypus Greenm. accepted as Pentacalia pachypus (Greenm.) Cuatrec.
- Species Senecio pachyrhizus O.Hoffm.
- Species Senecio pachythelis Phill. & C.A.Sm. accepted as Senecio conrathii N.E.Br.
- Species Senecio pachythelis E.Phillips & C.A.Sm. accepted as Senecio conrathii N.E.Br.
- Species Senecio pacificus (Greene) Rydb.
- Species Senecio paeninsularis S.Moore
- Species Senecio paeninsularis S.Moore ex Rendle
- Species Senecio pagosanus Heller
- Species Senecio pagosanus A.Heller accepted as Senecio amplectens var. amplectens A.Gray
- Species Senecio palenae Phil.
- Species Senecio pallasii Sch.Bip.
- Species Senecio pallens Wall.
- Species Senecio pallens Bojer ex DC. accepted as Senecio nudicaulis Buch.-Ham. ex D.Don
- Species Senecio pallescens Klatt
- Species Senecio pallidus Vell.
- Species Senecio palmatifidus (Siebold & Zucc.) Wittr. & Juel accepted as Ligularia japonica var. japonica
- Species Senecio palmatilobus Kitam. accepted as Sinosenecio palmatilobus (Kitam.) C.Jeffrey & Y.L.Chen
- Species Senecio palmatisectus Jeffrey accepted as Parasenecio palmatisectus (Jeffrey) Y.L.Chen
- Species Senecio palmatus Less.
- Species Senecio palmatus Lapeyr.
- Species Senecio palmatus Pall.
- Species Senecio palmatus (Pall.) Pall. ex Ledeb. accepted as Senecio cannabifolius var. cannabifolius
- Species Senecio palmensis Chr. Sm.
- Species Senecio palmensis (Nees) Buch accepted as Bethencourtia palmensis (Nees) Choisy ex Link
- Species Senecio palmensis (Nees) C.Sm. ex Link accepted as Bethencourtia palmensis (Nees) Choisy ex Link
- Species Senecio palmeri A.Gray
- Species Senecio paludaffinis Hilliard
- Species Senecio paludicola Steud. accepted as Erechtites valerianifolius (Link ex Wolf) Less. ex DC.
- Species Senecio paludosus L. accepted as Jacobaea paludosa (L.) G.Gaertn., B.Mey. & Scherb.
- Species Senecio palustris Vell. accepted as Erechtites valerianifolius (Link ex Wolf) Less. ex DC.
- Species Senecio palustris (L.) Hook. accepted as Tephroseris palustris (L.) Rchb.
- Species Senecio pammelii Greenm.
- Species Senecio pammicrocephalus S.Moore accepted as Emilia pammicrocephala (S.Moore) C.Jeffrey
- Species Senecio pampae Lingelsh.
- Species Senecio pampae Lingeslh. accepted as Senecio clivicola var. pampae (Lingelsh.) Cabrera
- Species Senecio pampeanus Cabrera
- Species Senecio pamplonensis Sch.Bip. ex Wedd.
- Species Senecio pancicii Degen accepted as Jacobaea arnautorum (Velen.) Pelser
- Species Senecio panduliformis M.Kitamura
- Species Senecio panduratus (Thunb.) Less.
- Species Senecio panduratus Less.
- Species Senecio panduratus DC.
- Species Senecio pandurifolius Harv. accepted as Senecio panduriformis Hilliard
- Species Senecio pandurifolius K.Koch accepted as Iranecio pandurifolius (K.Koch) C.Jeffrey
- Species Senecio panduriformis Hilliard
- Species Senecio paneroi B.L.Turner accepted as Psacaliopsis paneroi (B.L.Turner) C.Jeffrey
- Species Senecio paniculatus P.J.Bergius
- Species Senecio paniculatus Drège ex Harv. & Sond.
- Species Senecio paniculatus J.M.Wood accepted as Senecio chrysocoma Meerb.
- Species Senecio panticallensis Cabrera
- Species Senecio papagonius A.Nelson
- Species Senecio papaverifolius A.Rich. accepted as Crassocephalum ×picridifolium (DC.) S.Moore
- Species Senecio papillaris Sch.Bip.
- Species Senecio papillosus F.Muell.
- Species Senecio paposanus Phil. accepted as Senecio philippicus Regel & Körn.
- Species Senecio pappii ric. ex Ricardi & Martic.
- Species Senecio papposus (Rchb.) Less. accepted as Tephroseris papposa (Rchb.) Schur
- Species Senecio papuanus (Lauterb.) Belcher
- Species Senecio papyraceus DC. accepted as Pericallis papyracea (DC.) B.Nord.
- Species Senecio paradoxus Hoppe ex Willd.
- Species Senecio paradoxus Albov ex Kurtz accepted as Senecio kingii Hook.f.
- Species Senecio paraguariensis Mattf.
- Species Senecio paralias Phil.
- Species Senecio paramensis Cuatrec.
- Species Senecio paranaensis Dusén
- Species Senecio paranensis Malme
- Species Senecio parascitus Hilliard
- Species Senecio parasiticus Hemsl.
- Species Senecio parayanus J.García Pérez
- Species Senecio parayanus García-Pérez
- Species Senecio pardalianches E.H.L.Krause
- Species Senecio parentalis Hilliard & B.L.Burtt
- Species Senecio parkeri Baker accepted as Senecio hadiensis Forssk.
- Species Senecio parnassi Boiss. & Heldr. accepted as Tephroseris integrifolia (L.) Holub
- Species Senecio parnassiifolia De Wild. & Muschl. accepted as Emilia parnassiifolia (De Wild. & Muschl.) S.Moore
- Species Senecio parnassiifolius De Wild. & Muschl.
- Species Senecio parochetus Klatt accepted as Senecio faujasioides Baker
- Species Senecio parodii Cabrera
- Species Senecio parrasianus Greenm. accepted as Senecio scalaris var. parrasianus (Greenm.) C.C.Freeman
- Species Senecio parryi A.Gray
- Species Senecio parviflorus All.
- Species Senecio parviflorus Larrañaga
- Species Senecio parvifolius DC.
- Species Senecio parvocapitatus Cabrera
- Species Senecio pascoensis Cabrera
- Species Senecio pascuiandinus Cuatrec.
- Species Senecio passus-crucis Kuntze
- Species Senecio patagonicus Hook. & Arn.
- Species Senecio patagonicus Phil.
- Species Senecio patagonicus Phil. accepted as Senecio sericeo-nitens Speg.
- Species Senecio patens (Kunth) DC.
- Species Senecio patersonianus R.M.Burton
- Species Senecio pattersonensis Hoover
- Species Senecio pattersonii B.L.Turner
- Species Senecio patulus Burm. ex DC.
- Species Senecio paucicalyculatus Klatt
- Species Senecio paucicephalus R.A.Dyer accepted as Senecio affinis DC.
- Species Senecio paucidentatus DC.
- Species Senecio pauciflorus Pursh
- Species Senecio pauciflorus Thunb. ex Harv. & Sond.
- Species Senecio pauciflorus Baker
- Species Senecio pauciflorus Thunb. accepted as Senecio grandiflorus P.J.Bergius
- Species Senecio pauciflorus Kunth accepted as Packera bellidifolia (Kunth) W.A.Weber & Á.Löve
- Species Senecio pauciflosculosus C.Jeffrey
- Species Senecio paucifolius S.G.Gmel.
- Species Senecio paucifolius DC. accepted as Senecio ruwenzoriensis S.Moore
- Species Senecio paucijugus Baker
- Species Senecio pauciligulatus A.Rich.
- Species Senecio pauciligulatus R.A.Dyer & C.A.Sm. accepted as Senecio adnatus DC.
- Species Senecio paucilobus DC. accepted as Iranecio paucilobus (DC.) B.Nord.
- Species Senecio paucinervis Dunn accepted as Synotis erythropappa (Bureau & Franch.) C.Jeffrey & Y.L.Chen
- Species Senecio pauciradiatus Belcher
- Species Senecio paulensis Bong.
- Species Senecio paulsenii O.Hoffm. ex O. Hoffm. ex Pauls.
- Species Senecio paulsenii O.Hoffm.
- Species Senecio paupercula Michx.
- Species Senecio pauperculus Michx. accepted as Packera paupercula (Michx.) Á.Löve & D.Löve
- Species Senecio pavlovii Lipsch.
- Species Senecio pavonicus V.M.Badillo accepted as Pentacalia colombiana (Cuatrec.) Cuatrec.
- Species Senecio pavonii (Wedd.) Cuatrec.
- Species Senecio pearcei Phil. accepted as Senecio hieracium J.Rémy
- Species Senecio pearsonii Hutch.
- Species Senecio pectinatipinnatus Herter
- Species Senecio pectinatus DC.
- Species Senecio pectinatus D.Don ex Baker
- Species Senecio pectinatus (Baker) Herter
- Species Senecio pectinatus A.Nelson accepted as Senecio flaccidus var. monoensis (Greene) B.L.Turner & T.M.Barkley
- Species Senecio pectioides Rusby accepted as Senecio boliviensis Sch.Bip. ex Klatt
- Species Senecio peculiaris Dinter accepted as Mesogramma apiifolium DC.
- Species Senecio pedicularifolius DC. ex Steud.
- Species Senecio pedicularifolius Kunth accepted as Dorobaea pimpinellifolia (Kunth) B.Nord.
- Species Senecio pediculariifolius Kunth
- Species Senecio peduncularis Griseb.
- Species Senecio pedunculatus Sch.Bip.
- Species Senecio pedunculatus Edgew. accepted as Senecio krascheninnikovii var. krascheninnikovii
- Species Senecio pedunculosus Trautv. accepted as Iranecio lorentii (Hochst.) C.Jeffrey
- Species Senecio pedunculus Edgew. accepted as Senecio krascheninnikovii Schischk.
- Species Senecio peguanus DC.
- Species Senecio pelleifolius King ex J.R.Drumm.
- Species Senecio pellitus A.Gray accepted as Chersodoma antennaria (Wedd.) Cabrera
- Species Senecio pellucidinervis Sch.Bip. ex Baker
- Species Senecio pellucidinervis Sch.Bip.
- Species Senecio pellucidus DC.
- Species Senecio pelolepis I.M.Johnst. accepted as Senecio micropifolius DC.
- Species Senecio pelquensis Dusén
- Species Senecio peltatus DC. accepted as Senecio oxyriifolius DC.
- Species Senecio peltiferus Hemsl.
- Species Senecio peltiformis DC. accepted as Senecio oxyriifolius DC.
- Species Senecio peltophorus Brenan
- Species Senecio pembrinensis Greenm.
- Species Senecio pemehuensis Soldano
- Species Senecio pendulus Deflers
- Species Senecio pendulus (Forssk.) Sch.Bip. accepted as Kleinia pendula (Forssk.) DC.
- Species Senecio penicillatus (Cass.) Sch.Bip.
- Species Senecio peninsularis Vasey & Rose
- Species Senecio pennellii H.Rob. & Brettell accepted as Roldana pennellii H.Rob. & Brettell
- Species Senecio pennellii Greenm. accepted as Pentacalia kleinioides (Kunth) Cuatrec.
- Species Senecio penninervius DC.
- Species Senecio pensilis Greenm.
- Species Senecio pentacopus D.G.Drury accepted as Brachyglottis pentacopa (D.G.Drury) B.Nord.
- Species Senecio pentactinus Klatt
- Species Senecio pentadactylus Phil. accepted as Senecio trifurcatus (G.Forst.) Less.
- Species Senecio pentamerus Cuatrec. accepted as Paracalia pentamera (Cuatrec.) Cuatrec.
- Species Senecio pentanthus Merr. accepted as Synotis pentantha (Merr.) M.Tang, C.Ren & Q.E.Yang
- Species Senecio pentaphyllus Phil.
- Species Senecio pentapterus Cabrera
- Species Senecio pentecostus Hiern
- Species Senecio pentlandianus DC.
- Species Senecio pentlandicus DC.
- Species Senecio pentodonta Greene
- Species Senecio pentodontus Greene
- Species Senecio peraltae Phil. accepted as Senecio segethii Phil.
- Species Senecio percalvus A.Nelson
- Species Senecio perdicioides Hook.f. accepted as Brachyglottis perdicioides (Hook.f.) B.Nord.
- Species Senecio peregrinus Griseb. accepted as Dendrophorbium peregrinum (Griseb.) C.Jeffrey
- Species Senecio peregrinus (G.Kunkel) G.D.Rowley accepted as Curio peregrinus (G.Kunkel) P.V.Heath
- Species Senecio perennans A.Nelson accepted as Packera werneriifolia (A.Gray) W.A.Weber & Á.Löve
- Species Senecio perezii Cabrera
- Species Senecio pereziifolius Rydb. accepted as Senecio hydrophiloides Rydb.
- Species Senecio pergamentaceus Baker
- Species Senecio pericaulis Greenm. accepted as Dendrophorbium pericaule (Greenm.) B.Nord.
- Species Senecio perijaensis Cuatrec. accepted as Pentacalia perijaensis (Cuatrec.) Cuatrec.
- Species Senecio peripotamus C.Jeffrey
- Species Senecio perplexus A.Nelson accepted as Senecio integerrimus var. exaltatus (Nutt.) Cronquist
- Species Senecio perralderianus Coss.
- Species Senecio perrieri Humbert
- Species Senecio perrottetianus Klatt
- Species Senecio perrottetii DC.
- Species Senecio persicifolius L.
- Species Senecio persicifolius A.Rich.
- Species Senecio persicifolius Burm. ex DC.
- Species Senecio persicifolius Ramond
- Species Senecio persicifolius Burm. accepted as Senecio lineatus (L.f.) DC.
- Species Senecio persicus Boiss.
- Species Senecio persicus Sch.Bip.
- Species Senecio personii
- Species Senecio persoonii De Not. accepted as Jacobaea persoonii (De Not.) Pelser
- Species Senecio peruensis Cuatrec.
- Species Senecio peruvianus Pers. accepted as Pentacalia peruviana (Pers.) Cuatrec.
- Species Senecio petasioides Greenm. accepted as Roldana petasitis (Sims) H.Rob. & Brettell
- Species Senecio petasitis (Sims) DC. accepted as Roldana petasitis (Sims) H.Rob. & Brettell
- Species Senecio petasitoides H.Lév. accepted as Parasenecio petasitoides (H.Lév.) Y.L.Chen
- Species Senecio peteroanus Phil.
- Species Senecio petiolaris DC.
- Species Senecio petiolaris Less. ex Harv. & Sond.
- Species Senecio petiolaris Less. accepted as Senecio lessingii Harv.
- Species Senecio petiolatus Cotton accepted as Senecio johnstonii subsp. adnivalis (Stapf) C.Jeffrey
- Species Senecio petiolatus Cotton ex Hauman accepted as Dendrosenecio adnivalis var. petiolatus (Hedberg) E.B.Knox
- Species Senecio petiolincrassatus Cabrera & Zardini accepted as Pentacalia petiolincrassata (Cabrera & Zardini) H.Beltrán
- Species Senecio petitianus A.Rich. accepted as Senecio hadiensis Forssk.
- Species Senecio petraeus Boiss. & Reut.
- Species Senecio petraeus (R.E.Fr.) H.Jacobsen
- Species Senecio petraeus Klatt accepted as Packera werneriifolia (A.Gray) W.A.Weber & Á.Löve
- Species Senecio petraeus (R.E.Fr.) Muschl. accepted as Kleinia petraea (R.E.Fr.) C.Jeffrey
- Species Senecio petrocallis Greene
- Species Senecio petrophilus Klatt accepted as Senecio canaliculatus Bojer ex DC.
- Species Senecio petrophilus Greene accepted as Packera werneriifolia (A.Gray) W.A.Weber & Á.Löve
- Species Senecio petrophyus Pelser
- Species Senecio peucedanifolius L.f.
- Species Senecio pfisteri Ricardi & Martic.
- Species Senecio pflanzii (Perkins) Cuatrec.
- Species Senecio phaeanthus Nakai accepted as Tephroseris phaeantha (Nakai) C.Jeffrey & Y.L.Chen
- Species Senecio phaedrus Phil.
- Species Senecio phaenicochaetus Franch.
- Species Senecio phagnaloides DC.
- Species Senecio phalacrocarpoides Chang accepted as Sinosenecio phalacrocarpoides B.Nord.
- Species Senecio phalacrocarpus Hance accepted as Sinosenecio phalacrocarpus (Hance) B.Nord.
- Species Senecio phalacrolaenus DC. accepted as Senecio incisus Thunb.
- Species Senecio phanerandrus Cufod.
- Species Senecio phelleus I.Thomps.
- Species Senecio phellorhizus Muschl. accepted as Kleinia grantii (Oliv. & Hiern) Hook.f.
- Species Senecio phelpsiae Cuatrec. accepted as Pentacalia phelpsiae (Cuatrec.) Cuatrec.
- Species Senecio philippicus Regel & Körn.
- Species Senecio philippii Sch.Bip. ex Wedd.
- Species Senecio philippii Sch.Bip.
- Species Senecio philippii De Wild. accepted as Senecio laseguei
- Species Senecio phoenicochaetus Franch. accepted as Ligularia phoenicochaeta (Franch.) S.W.Liu
- Species Senecio phonolithicus Dinter accepted as Senecio sarcoides C.Jeffrey
- Species Senecio phorodendroides L.O.Williams
- Species Senecio phylicifolius Poepp. ex DC.
- Species Senecio phyllocomus Phil. accepted as Senecio molinae Phil.
- Species Senecio phyllolepis Franch. accepted as Parasenecio phyllolepis (Franch.) Y.L.Chen
- Species Senecio phylloleptus Cuatrec.
- Species Senecio phyllomorphus Steud. accepted as Senecio pilquensis H.Buek
- Species Senecio picardae Krug & Urb.
- Species Senecio pichinchensis Greenm. accepted as Pentacalia arbutifolia (Kunth) Cuatrec.
- Species Senecio pichinchensis (Cuatrec.) Cuatrec. accepted as Senecio lingulatus (Willd. ex Schltdl.) Cuatrec.
- Species Senecio pichineuquensis Tortosa & Adr.Bartoli
- Species Senecio pickeringii A.Gray
- Species Senecio picridifolius A.Chev.
- Species Senecio picridifolius DC. accepted as Crassocephalum ×picridifolium (DC.) S.Moore
- Species Senecio picridioides (Turcz.) M.E.Lawr.
- Species Senecio picridis S.Schauer
- Species Senecio picticaulis P.R.O.Bally accepted as Kleinia picticaulis (P.R.O.Bally) C.Jeffrey
- Species Senecio piedrahitae J.Calvo & F.Ávila
- Species Senecio piepaloensis M.G.López & Xifreda
- Species Senecio pierotii Miq.
- Species Senecio pilgerianus Muschl.
- Species Senecio pilgerianus Diels accepted as Parasenecio pilgerianus (Diels) Y.L.Chen
- Species Senecio pillansii Levyns
- Species Senecio pilosicristus I.Thomps.
- Species Senecio pilosiusculus C.B.Clarke accepted as Senecio wightii (DC. ex Wight) Benth. ex C.B.Clarke
- Species Senecio pilotus Phil.
- Species Senecio pilotus Phil. ex Kuntze
- Species Senecio pilquensis H.Buek
- Species Senecio pimpinellifolius Kunth accepted as Dorobaea pimpinellifolia (Kunth) B.Nord.
- Species Senecio pinacatensis Felger
- Species Senecio pinachensis Cabrera
- Species Senecio pinceus Sch.Bip.
- Species Senecio pindilicensis Hieron.
- Species Senecio pinetorum Hemsl.
- Species Senecio pinguiculus Pomel accepted as Senecio leucanthemifolius Poir.
- Species Senecio pinguifolius (DC.) Sch.Bip.
- Species Senecio pinifolius Dusén
- Species Senecio pinifolius (L.) Lam.
- Species Senecio pinifolius Willd. ex Wedd.
- Species Senecio pinifolius Pers.
- Species Senecio pinnatifidus (P.J.Bergius) Less.
- Species Senecio pinnatifidus DC.
- Species Senecio pinnatifidus Phil.
- Species Senecio pinnatifidus C.B.Clarke accepted as Senecio madrasensis C.Jeffrey
- Species Senecio pinnatifolius A.Rich.
- Species Senecio pinnatilobatus Sch.Bip.
- Species Senecio pinnatilobatus Sch.Bip. ex Wedd.
- Species Senecio pinnatipartitus Sch.Bip. ex Oliv.
- Species Senecio pinnatisecta
- Species Senecio pinnatisectus DC. accepted as Packera sanguisorbae (DC.) C.Jeffrey
- Species Senecio pinnatulus Steud.
- Species Senecio pinnatus Poir.
- Species Senecio pinnatus Sch.Bip.
- Species Senecio pinnatus Sessé & Moc.
- Species Senecio pinnatus DC. accepted as Senecio platensis Arechav.
- Species Senecio pinnulatus Thunb.
- Species Senecio pinnulatus Sieber accepted as Senecio crassiusculus DC.
- Species Senecio pinnulatus Sieber ex Harv. & Sond. accepted as Senecio crassiusculus DC.
- Species Senecio piptocoma O.Hoffm.
- Species Senecio piptocoma O.Hoffm. ex Schinz
- Species Senecio pirottae Chiov.
- Species Senecio piscicellianus Buscal. & Muschl.
- Species Senecio pisidicus Boiss.
- Species Senecio pissisii Phil.
- Species Senecio pithosillum DC.
- Species Senecio pittieri Cuatrec. accepted as Senecio longepenicillatus Sch.Bip. ex Sandwith
- Species Senecio piurensis Sagást. & Zardini
- Species Senecio placillae Steud.
- Species Senecio planiflorus Kunze ex Cabrera
- Species Senecio plantagineoides C.Jeffrey
- Species Senecio plantagineus DC.
- Species Senecio plantagineus Bertero ex Colla
- Species Senecio plantagineus E.H.L.Krause
- Species Senecio plantagineus Bertero accepted as Senecio arnicoides Hook. & Arn.
- Species Senecio plantaginifolius Franch. accepted as Ligularia virgaurea (Maxim.) Mattf. ex Rehder & Kobuski
- Species Senecio platanifolius Benth.
- Species Senecio platensis Arechav.
- Species Senecio plattensis (Packera) Nutt.
- Species Senecio platycodon Baker
- Species Senecio platyglossus Franch. accepted as Ligularia platyglossa (Franch.) Hand.-Mazz.
- Species Senecio platylepis DC.
- Species Senecio platylobus Rydb. accepted as Packera streptanthifolia (Greene) W.A.Weber & Á.Löve
- Species Senecio platyphylloides Sommier & Levier accepted as Caucasalia pontica (K.Koch) Greuter
- Species Senecio platyphyllus DC. accepted as Caucasalia macrophylla (M.Bieb.) B.Nord.
- Species Senecio platypleurus Cufod. accepted as Senecio aequinoctialis R.E.Fr.
- Species Senecio platypus Greenm.
- Species Senecio platzii Volkens
- Species Senecio platzii Volkens & Muschl. ex Muschl. accepted as Senecio purtschelleri Engl.
- Species Senecio plebeius Banks & Sol. ex Hook.f.
- Species Senecio plebeius DC. accepted as Senecio laevigatus var. laevigatus Thunb.
- Species Senecio pleianthus (Humbert) Humbert
- Species Senecio pleistocephalus S.Moore
- Species Senecio pleistophyllus C.Jeffrey
- Species Senecio pleniauritus Cuatrec.
- Species Senecio pleopterus Diels accepted as Senecio graciliflorus (Wall.) DC.
- Species Senecio pleurocaulis Franch. accepted as Ligularia pleurocaulis (Franch.) Hand.-Mazz.
- Species Senecio plumbeus Griseb.
- Species Senecio pluricephalus Cabrera
- Species Senecio poculiferus S.Moore ex Rendle
- Species Senecio poculiferus S.Moore accepted as Senecio kingii Hook.f.
- Species Senecio podolianus Panigrahi
- Species Senecio poeppigii Hook. & Arn.
- Species Senecio poeppigii (DC.) Cuatrec.
- Species Senecio poeppigii Wedd.
- Species Senecio poggeanus Mattf.
- Species Senecio pogonias Cabrera
- Species Senecio pohlii Sch.Bip. ex Baker
- Species Senecio pohlii Sch.Bip.
- Species Senecio pojarkovae Schischk. accepted as Pojarkovia pojarkovae (Schischk.) Greuter
- Species Senecio polelensis Hilliard
- Species Senecio polifolius L.
- Species Senecio pollicaris DC. ex Bojer
- Species Senecio polyadenus Hedberg
- Species Senecio polyanthemoides Sch.Bip.
- Species Senecio polyanthemus DC.
- Species Senecio polycephalus (DC.) C.B.Clarke accepted as Senecio multiceps N.P.Balakr.
- Species Senecio polycephalus Ledeb. accepted as Senecio leucanthemifolius subsp. vernalis (Waldst. & Kit.) Greuter
- Species Senecio polychotomus (Chiov.) H.Jacobsen accepted as Kleinia odora (Forssk.) DC.
- Species Senecio polygaloides Phil.
- Species Senecio polygonoides Muschl. accepted as Senecio hochstetteri Sch.Bip. ex A.Rich.
- Species Senecio polygonoides Cuatrec. accepted as Aequatorium polygonoides (Cuatrec.) B.Nord.
- Species Senecio polylepis Sch.Bip.
- Species Senecio polymerus Klatt accepted as Pentacalia polymera (Klatt) Cuatrec.
- Species Senecio polymorphus Sch.Bip.
- Species Senecio polyodon DC.
- Species Senecio polyphlebius Griseb.
- Species Senecio polyphyllus Kunze ex DC.
- Species Senecio polyphyllus Sch.Bip. accepted as Senecio bipontinii Wedd.
- Species Senecio polyphyllus Sch.Bip. ex Wedd. accepted as Senecio bipontinii Wedd.
- Species Senecio polypodioides Greene
- Species Senecio polypodioides B.L.Rob. & Greenm.
- Species Senecio polypodioides (Greene) B.D.Jacks. & T.Durand
- Species Senecio polyrhizus Baker accepted as Senecio emirnensis var. vittarifolius (Bojer ex DC.) Humbert
- Species Senecio pomacochana Cuatrec.
- Species Senecio pomacochanus Cuatrec. accepted as Pentacalia pomacochana (Cuatrec.) Cuatrec.
- Species Senecio pondoensis van Jaarsv. & A.E.van Wyk
- Species Senecio pongoensis Cuatrec.
- Species Senecio ponticus Grecescu
- Species Senecio popayanensis Hieron. accepted as Pentacalia popayanensis (Hieron.) Cuatrec.
- Species Senecio populifolius Burm. ex DC. accepted as Pericallis appendiculata (L.f.) B.Nord.
- Species Senecio populifolius L. accepted as Senecio halimifolius L.
- Species Senecio porophylloides J.Rémy accepted as Senecio pilquensis H.Buek
- Species Senecio porphyranthus Schischk.
- Species Senecio porphyresthes T.M.Barkley
- Species Senecio portalesianus J.Rémy
- Species Senecio porteri Greene accepted as Packera porteri (Greene) C.Jeffrey
- Species Senecio portulacoides J.Rémy
- Species Senecio poseideonis Hilliard & B.L.Burtt
- Species Senecio potamogetonifolius Sch.Bip.
- Species Senecio potamogetonifolius Sch.Bip. ex F.Phil. accepted as Senecio zosterifolius Hook. & Arn.
- Species Senecio potaninii C.Winkl. accepted as Ligularia potaninii (C.Winkl.) Ling
- Species Senecio potosianus Klatt
- Species Senecio potosinus Greenm.
- Species Senecio pottsii Armstr.
- Species Senecio powellii B.L.Turner
- Species Senecio poyasensis Cuatrec.
- Species Senecio praealtus Bertol. accepted as Jacobaea erucifolia subsp. praealta (Bertol.) Greuter & B.Nord.
- Species Senecio praecox (Cav.) DC.
- Species Senecio praeruptorum Sch.Bip. ex Klatt
- Species Senecio praeruptorum Sch.Bip. accepted as Senecio praeruptorum Sch.Bip. ex Klatt
- Species Senecio praeteritus Killick
- Species Senecio prainianus A.Berger accepted as Roldana angulifolia (DC.) H.Rob. & Brettell
- Species Senecio pratensis Schur
- Species Senecio pratensis Kom.
- Species Senecio pratensis Phil. accepted as Senecio glaber Less.
- Species Senecio pratensis DC. accepted as Tephroseris integrifolia (L.) Holub
- Species Senecio pratensis Richt. accepted as Jacobaea aquatica (Hill) G.Gaertn., B.Mey. & Scherb.
- Species Senecio praticola Rouy
- Species Senecio praticola Schischk. & Serg. accepted as Tephroseris praticola (Schischk. & Serg.) Holub
- Species Senecio praticolus Schischk. & Serg. accepted as Tephroseris praticola (Schischk. & Serg.) Holub
- Species Senecio prattii Hemsl. accepted as Cremanthodium prattii (Hemsl.) R.D.Good
- Species Senecio prenanthiflorus Benth. & Hook.f.
- Species Senecio prenanthiflorus (Burch. ex DC.) Hemsl.
- Species Senecio prenanthifolius Phil.
- Species Senecio prenanthoidea (DC.) K.Schum. & Lauterb. accepted as Emilia prenanthoidea DC.
- Species Senecio prenanthoides A.Rich.
- Species Senecio pretioides Rusby
- Species Senecio pricei N.D.Simpson
- Species Senecio prichardii S.Moore ex Rendle
- Species Senecio prichardii S.Moore accepted as Senecio miser Hook.f.
- Species Senecio primulifolius F.Muell.
- Species Senecio primulifolius H.Lév.
- Species Senecio primulifolius Vell.
- Species Senecio primulifolius Sommier & Levier. accepted as Tephroseris integrifolia subsp. primulifolia (Cufod.) Greuter
- Species Senecio principis Franch. accepted as Cremanthodium principis (Franch.) R.D.Good
- Species Senecio pringlei A.Gray
- Species Senecio prionites MacOwan accepted as Senecio hypochoerideus DC.
- Species Senecio prionophyllus Franch. accepted as Synotis nagensium (C.B.Clarke) C.Jeffrey & Y.L.Chen
- Species Senecio prionophyllus Greene accepted as Packera hartiana (A.Heller) W.A.Weber & Á.Löve
- Species Senecio prionopterus B.L.Rob. & Greenm.
- Species Senecio procerus (Griseb.) Vel.
- Species Senecio procerus Salisb.
- Species Senecio procerus (Griseb.) Boiss. accepted as Tephroseris papposa (Rchb.) Schur
- Species Senecio proculifer S.Moore
- Species Senecio procumbens Kunth
- Species Senecio productus I.Thomps.
- Species Senecio profundorum Dunn accepted as Parasenecio profundorum (Dunn) Y.L.Chen
- Species Senecio prolixus Greenm. accepted as Packera multilobata (Torr. & A.Gray ex A.Gray) W.A.Weber & Á.Löve
- Species Senecio promatensis Matzenb.
- Species Senecio promaucanus Phil.
- Species Senecio propinquus Schischk.
- Species Senecio propior S.Moore
- Species Senecio proprior S.Moore
- Species Senecio proprius Gand.
- Species Senecio prostratus Klatt
- Species Senecio proteus J.Rémy
- Species Senecio protractus (S.Moore) Eyles accepted as Emilia protracta S.Moore
- Species Senecio provincialis (L.) Druce
- Species Senecio prunifolius Wedd.
- Species Senecio prunioides Rusby accepted as Pentacalia jelskii (Hieron.) Cuatrec.
- Species Senecio przewalskii Maxim. accepted as Ligularia przewalskii (Maxim.) Diels
- Species Senecio psammoecus Cabrera accepted as Senecio anthemidiphyllus J.Rémy
- Species Senecio psammophilus Phil. accepted as Senecio anthemidiphyllus J.Rémy
- Species Senecio psammophilus Griseb. accepted as Senecio filaginoides DC.
- Species Senecio pseudalmeidae Cabrera
- Species Senecio pseudaspericaulis Cabrera
- Species Senecio pseudaureus Rydb. accepted as Packera pseudaurea var. pseudaurea (Rydb.) W.A.Weber & Á.Löve
- Species Senecio pseuderucoides Cabrera
- Species Senecio pseudo Sch.Bip.
- Species Senecio pseudoalatus Chang accepted as Synotis pseudoalata C.Jeffrey & Y.L.Chen
- Species Senecio pseudoarnica Less.
- Species Senecio pseudoauranticus Kom. accepted as Tephroseris integrifolia subsp. atropurpurea (Ledeb.) B.Nord.
- Species Senecio pseudochina Andrews
- Species Senecio pseudochina L. accepted as Gynura pseudochina (L.) DC.
- Species Senecio pseudocrispus (Fiori) E.Mayer accepted as Tephroseris longifolia subsp. pseudocrispa (Fiori) Greuter
- Species Senecio pseudodensiserratus T.J. Tong, M. Tang, C. Ren & Q.E. Yang
- Species Senecio pseudodensiserratus T.J.Tong, M.Tang, C.Ren & Q.E.Yang
- Species Senecio pseudodepressus L.Salomón & S.E.Freire
- Species Senecio pseudodiscoideus Sch.Bip. ex F.Phil.
- Species Senecio pseudodoronicum Schur accepted as Senecio doronicum subsp. transylvanicus (Boiss.) Nyman
- Species Senecio pseudoelegans Less. accepted as Senecio elegans L.
- Species Senecio pseudoformosus Cuatrec.
- Species Senecio pseudogerardi Rouy
- Species Senecio pseudolongifolius Sch.Bip.
- Species Senecio pseudolongifolius Sch.Bip. ex J.Calvo
- Species Senecio pseudomairei H.Lév.
- Species Senecio pseudoorientalis Schischk.
- Species Senecio pseudopicridis T.M.Barkley
- Species Senecio pseudopohlii Cabrera
- Species Senecio pseudoracemosus Grossh. accepted as Senecio racemosus (M.Bieb.) DC.
- Species Senecio pseudorhyncholaenus Thell. accepted as Senecio subrubriflorus O.Hoffm.
- Species Senecio pseudosceptrum Steud. accepted as Senecio spiraeifolius Thunb.
- Species Senecio pseudosonchus Vaniot accepted as Tephroseris pseudosonchus (Vaniot) C.Jeffrey & Y.L.Chen
- Species Senecio pseudostigophlebius Cabrera
- Species Senecio pseudosubsessilis C.Jeffrey
- Species Senecio pseudosylvaticus Lojac.
- Species Senecio pseudotamoides Thell.
- Species Senecio pseudotites Griseb.
- Species Senecio pseudotomentosus Mack. & Bush accepted as Packera plattensis (Nutt.) W.A.Weber & Á.Löve
- Species Senecio pseudovernalis Zabel ex Nyman
- Species Senecio psiadioides O.Hoffm. accepted as Senecio maranguensis O.Hoffm.
- Species Senecio psidiifolius Rusby
- Species Senecio psilocarpus Belcher & Albr.
- Species Senecio psilophyllus I.Thomps.
- Species Senecio psychrophilus Wedd. accepted as Senecio nutans Sch.Bip.
- Species Senecio ptarianus Cuatrec. accepted as Pentacalia ptariana (Cuatrec.) Cuatrec.
- Species Senecio ptarmicifolius Bory
- Species Senecio pteridophyllus Franch.
- Species Senecio pterocarpus Steud.
- Species Senecio pterocaulis Greenm. accepted as Packera werneriifolia (A.Gray) W.A.Weber & Á.Löve
- Species Senecio pteroneurus (DC.) Ball
- Species Senecio pteroneurus (DC.) Sch.Bip. accepted as Kleinia anteuphorbium (L.) Haw.
- Species Senecio pterophorus DC.
- Species Senecio pteropodus W.W.Sm. accepted as Senecio nigrocinctus Franch.
- Species Senecio pteropogon Griseb. accepted as Leucheria pteropogon (Griseb.) Cabrera
- Species Senecio puberulus DC.
- Species Senecio pubescens Phil.
- Species Senecio pubescens S.Moore
- Species Senecio pubigerus L.
- Species Senecio pucapampaensis H.Beltrán
- Species Senecio puchi Phil.
- Species Senecio puchii Phil.
- Species Senecio pudicus Greene
- Species Senecio puffini Allan ex Rehder
- Species Senecio puffinii Allan ex. Rehder accepted as Brachyglottis rotundifolia J.R.Forst. & G.Forst.
- Species Senecio pugioniformis Sch.Bip.
- Species Senecio pulchellus (Kunth) DC. accepted as Monticalia pulchella (Kunth) C.Jeffrey
- Species Senecio pulchellus Kunth accepted as Gynoxys pulchella (Kunth) Cass.
- Species Senecio pulcher Hook. & Arn.
- Species Senecio pulchrifolius Cabrera accepted as Senecio abadianus DC.
- Species Senecio pulicarioides Baker
- Species Senecio pullus Klatt accepted as Senecio umgeniensis Thell.
- Species Senecio pulviniformis Hieron. accepted as Senecio humillimus Sch.Bip. ex Wedd.
- Species Senecio pumiceus Colenso accepted as Senecio banksii Hook.f.
- Species Senecio pumilus Tortosa & Bartoli
- Species Senecio pumilus Poir. ex DC.
- Species Senecio punae Cabrera
- Species Senecio puna-sessilis Cuatrec.
- Species Senecio punctarenicus E.H.L.Krause
- Species Senecio punctarenicus Krause accepted as Senecio smithii DC.
- Species Senecio punduahensis Sch.Bip.
- Species Senecio pungens (Kunth) DC. accepted as Monticalia pulchella (Kunth) C.Jeffrey
- Species Senecio puracensis (Cuatrec.) Cuatrec.
- Species Senecio purdomii Turrill accepted as Ligularia purdomii (Turrill) Chitt.
- Species Senecio purpurascens Klatt accepted as Senecio helodes Benth.
- Species Senecio purpuratus Phil. accepted as Senecio subdiscoideus Sch.Bip. ex Wedd.
- Species Senecio purpureo-viridis Baker accepted as Senecio resectus boj ex DC.
- Species Senecio purpureus L.
- Species Senecio purpureus P.Willemet
- Species Senecio purpurivenosus Cuatrec. accepted as Pentacalia purpurivenosa (Cuatrec.) Cuatrec.
- Species Senecio purpusii Greenm. ex Brandegee accepted as Psacaliopsis purpusii (Greenm. ex Brandegee) H.Rob. & Brettell
- Species Senecio purshianus Nutt. accepted as Packera cana (Hook.) W.A.Weber & Á.Löve
- Species Senecio purtschelleri Engl.
- Species Senecio pururu Cuatrec. accepted as Dendrophorbium pururu (Cuatrec.) C.Jeffrey
- Species Senecio pusillus Dinter ex Range
- Species Senecio pusillus Guss. ex DC.
- Species Senecio pusillus A.Rich.
- Species Senecio putcalensis Hieron. accepted as Talamancalia putcalensis (Hieron.) B.Nord. & Pruski
- Species Senecio putjatae C.Winkl. accepted as Ligularia mongolica (Turcz.) DC.
- Species Senecio pycnanthus Phil.
- Species Senecio pygmaeus DC. accepted as Senecio leucanthemifolius Poir.
- Species Senecio pyramidatus DC.
- Species Senecio pyrenaicus L.
- Species Senecio pyrenaicus L. ex Loefl.
- Species Senecio pyrenaicus Gren. & Godr. accepted as Tephroseris helenitis (L.) B.Nord.
- Species Senecio pyrenophilus Cuatrec.
- Species Senecio pyrifolius B.L.Rob.
- Species Senecio pyrifolius Mart. ex Baker
- Species Senecio pyroglossus Kar. & Kir.
- Species Senecio pyrolifolius H.Lév.
- Species Senecio pyroloides Greenm.
- Species Senecio pyrophilus Zoll. & Moritzi
- Species Senecio pyrrhochrous Greene accepted as Packera crocata (Rydb.) W.A.Weber & Á.Löve
- Species Senecio pyrrhopappus Sch.Bip.
- Species Senecio pyrropappus Franch. accepted as Ligularia cymbulifera (W.W.Sm.) Hand.-Mazz.
- Species Senecio qathlambanus Hilliard
- Species Senecio quadridentatus Labill.
- Species Senecio quaerens Greene accepted as Packera hartiana (A.Heller) W.A.Weber & Á.Löve
- Species Senecio quartinianus Asch. accepted as Emilia abyssinica var. abyssinica
- Species Senecio quartziticola Humbert
- Species Senecio quaylei T.M.Barkley
- Species Senecio quebradensis Greenm.
- Species Senecio queenslandicus I.Thomps.
- Species Senecio quenselii Skottsb.
- Species Senecio quequensis Cabrera accepted as Senecio bergii Hieron.
- Species Senecio quercetorum Greene
- Species Senecio quercifolius Pourr. ex Steud.
- Species Senecio quercifolius Thunb. accepted as Senecio ilicifolius L.
- Species Senecio quezalticus L.O.Williams accepted as Trixis anomala B.L.Turner
- Species Senecio quillotensis Phil.
- Species Senecio quinquangulatus Sch.Bip.
- Species Senecio quinqueflorus DC. accepted as Senecio bipinnatus (Thunb.) Less.
- Species Senecio quinquelepis (Hieron.) Hieron. ex Cabrera
- Species Senecio quinqueligulatus C.Winkl.
- Species Senecio quinquelobus (Thunb.) DC.
- Species Senecio quinquelobus (Wall. ex DC.) Hook.f. & Thomson ex C.B.Clarke accepted as Parasenecio quinquelobus (Wall. ex DC.) Y.L.Chen
- Species Senecio quinquelobus (Wall. ex DC.) Hook.f. & Thoms accepted as Parasenecio quinquelobus (Wall. ex DC.) Y.L.Chen
- Species Senecio quinquenervius Sond. ex Sond.
- Species Senecio quinquenervius Sond. ex Harv. & Sond.
- Species Senecio quinqueradiatus Boiss.
- Species Senecio quinqueradiatus Boiss. ex DC.
- Species Senecio quiroranus Cuatrec. accepted as Pentacalia quirorana (Cuatrec.) Cuatrec.
- Species Senecio quitensis Cuatrec. accepted as Senecio lingulatus (Willd. ex Schltdl.) Cuatrec.
- Species Senecio rabani C.B.Clarke
- Species Senecio rabanii C.B.Clarke accepted as Senecio wightii (DC. ex Wight) Benth. ex C.B.Clarke
- Species Senecio racemosus (M.Bieb.) DC.
- Species Senecio racemosus Wall. accepted as Ligularia fischeri (Ledeb.) Turcz.
- Species Senecio racemulifer Pavlov accepted as Jacobaea racemulifera (Pavlov) C.Ren & Q.E.Yang
- Species Senecio radiatus Cuatrec.
- Species Senecio radicans (L.f.) Sch.Bip.
- Species Senecio radiolatus F.Muell.
- Species Senecio radulaefolius (Kunth) Hemsl. accepted as Psacalium radulifolium (Kunth) H.Rob. & Brettell
- Species Senecio radulifolius Sch.Bip.
- Species Senecio ragazzii Chiov.
- Species Senecio ragonesei Cabrera
- Species Senecio rahmeri Phil.
- Species Senecio ramboanus Cabrera
- Species Senecio ramentaceus Baker
- Species Senecio ramentosus Cuatrec. accepted as Pentacalia ramentosa (Cuatrec.) Cuatrec.
- Species Senecio ramonii Cuatrec. accepted as Pentacalia oronocensis (DC.) Cuatrec.
- Species Senecio ramosissimus DC.
- Species Senecio ramosus Wall. ex DC.
- Species Senecio ramosus Wall. accepted as Senecio ramosus Wall. ex DC.
- Species Senecio ramsbottomii Hand.-Mazz. accepted as Senecio biligulatus W.W.Sm.
- Species Senecio rancaguensis J.Rémy
- Species Senecio rancoensis Sch.Bip. ex F.Phil.
- Species Senecio ranconensis Sch.Bip.
- Species Senecio ranconensis Sch.Bip. ex Ball
- Species Senecio ranconensis Sch.Bip. ex Phil. accepted as Senecio prenanthifolius Phil.
- Species Senecio ranconensis Sch.Bip. ex Lechl. accepted as Senecio prenanthifolius Phil.
- Species Senecio randii S.Moore
- Species Senecio rangei Muschl. ex Dinter
- Species Senecio rapae F.Br. accepted as Emilia coccinea (Sims) G.Don
- Species Senecio raphanifolius Wall. ex DC.
- Species Senecio raphanifolius Wall.
- Species Senecio rapifolius Nutt.
- Species Senecio rapistroides DC.
- Species Senecio rariflorus K.Koch
- Species Senecio rauchii Matzenb.
- Species Senecio rauhii Cuatrec.
- Species Senecio rauranus Cuatrec.
- Species Senecio rautaneni (S.Moore) S.Moore accepted as Senecio eenii (S.Moore) Merxm.
- Species Senecio ravidus C.Winkl.
- Species Senecio rawsonianus Greene accepted as Senecio aronicoides DC.
- Species Senecio reclinatus L.f.
- Species Senecio rectiramus Baker accepted as Austrosynotis rectirama (Baker) C.Jeffrey
- Species Senecio recurvatus Kunth
- Species Senecio redivivus Mabb.
- Species Senecio reedi Phil.
- Species Senecio reedii Phil.
- Species Senecio reflexifolius Cuatrec.
- Species Senecio reflexus Kunth accepted as Pentacalia reflexa (Kunth) Cuatrec.
- Species Senecio reflexus (Kunth) Cuatrec. accepted as Senecio superandinus Cuatrec.
- Species Senecio refractisquamatus De Wild. accepted as Dendrosenecio adnivalis var. adnivalis
- Species Senecio regiomontanus DC.
- Species Senecio regis H.Rob.
- Species Senecio reglensis Greenm. accepted as Roldana reglensis (Greenm.) H.Rob. & Brettell
- Species Senecio regularis Sch.Bip.
- Species Senecio rehmannii Bolus
- Species Senecio rehmannii Bolus.
- Species Senecio reicheanus Cabrera
- Species Senecio reinoldii Endl. ex Hook.f.
- Species Senecio reinoldii Endl. accepted as Brachyglottis rotundifolia J.R.Forst. & G.Forst.
- Species Senecio reisackii Grembl. ex Nyman
- Species Senecio reissianus Hieron. accepted as Pentacalia reissiana (Hieron.) Cuatrec.
- Species Senecio reitzianus Cabrera
- Species Senecio remifolius Wooton & Standl.
- Species Senecio remipes W.W.Sm. accepted as Ligularia tsangchanensis (Franch.) Hand.-Mazz.
- Species Senecio remyanus Phil. accepted as Senecio crithmoides Hook. & Arn.
- Species Senecio renardii C.Winkl.
- Species Senecio renatus Franch. accepted as Cremanthodium decaisnei C.B.Clarke
- Species Senecio renifolius Porter & J.M.Coult.
- Species Senecio renifolius Porter accepted as Packera porteri (Greene) C.Jeffrey
- Species Senecio renifolius (C.A.Mey.) Sch.Bip. accepted as Dolichorrhiza renifolia (C.A.Mey.) Galushko
- Species Senecio reniformis (Hook.) MacMill. accepted as Arnoglossum reniforme (Hook.) H.Rob.
- Species Senecio reniformis Wall. accepted as Cremanthodium reniforme (DC.) Benth.
- Species Senecio renjifoanus Phil.
- Species Senecio repandus Thunb.
- Species Senecio repandus Hook.f. ex Müll.Berol.
- Species Senecio repandus Thunb. ex Harv. & Sond.
- Species Senecio repangae de Lange & B.G.Murray
- Species Senecio repens Stokes
- Species Senecio repens DC.
- Species Senecio repens Dulac
- Species Senecio repens (L.) H.Jacobsen
- Species Senecio repens (L.) Baill. accepted as Kleinia repens (L.) Haw.
- Species Senecio repollensis Cabrera
- Species Senecio reptans Turcz.
- Species Senecio resectus boj ex DC.
- Species Senecio resedifolius Less. accepted as Packera heterophylla (Fisch.) E.Wiebe
- Species Senecio resinosus Dusén
- Species Senecio retanensis Cabrera
- Species Senecio reticulatus DC.
- Species Senecio reticulatus C.B.Clarke
- Species Senecio retortus (DC.) Benth.
- Species Senecio retrorsus DC.
- Species Senecio retusus Wall.
- Species Senecio retusus (DC.) Wall. ex Hook.f. accepted as Ligularia retusa DC.
- Species Senecio retusus (DC.) Wall ex C.B.Clarke accepted as Ligularia retusa DC.
- Species Senecio reverdattoi K.Sobol.
- Species Senecio reverdattoi Sobolevsk. accepted as Tephroseris turczaninovii (DC.) Holub
- Species Senecio revolutus Kirk accepted as Brachyglottis revoluta (Kirk) B.Nord.
- Species Senecio revolutus Hoover accepted as Senecio pattersonensis Hoover
- Species Senecio rex (Sandwith) Cuatrec. accepted as Pentacalia rex (Sandwith) Cuatrec.
- Species Senecio rhabdos C.B.Clarke
- Species Senecio rhammatophyllus Mattf.
- Species Senecio rhizocephalus A.Gray
- Species Senecio rhizocephalus Turcz. accepted as Senecio repens Stokes
- Species Senecio rhizocephalus A.Gray ex Wedd. accepted as Senecio condimentarius Cabrera
- Species Senecio rhizomatus Rusby
- Species Senecio rhodanthus Baker accepted as Emilia graminea DC.
- Species Senecio rhodaster Baker accepted as Senecio bonariensis Hook. & Arn.
- Species Senecio rhombifolius (Willd.) Sch.Bip. accepted as Adenostyles rhombifolia (Willd.) Pimenov
- Species Senecio rhombifolius Bolle accepted as Senecio bollei Sunding & G.Kunkel
- Species Senecio rhomboideus Harv.
- Species Senecio rhopalodenia Dinter accepted as Senecio radicans (L.f.) Sch.Bip.
- Species Senecio rhopalophyllus (Dinter) Merxm. accepted as Senecio aloides DC.
- Species Senecio rhyacophilus Greenm.
- Species Senecio rhyncholaenus DC.
- Species Senecio ricardii Martic. & Quezada
- Species Senecio richardianus DC.
- Species Senecio richardsonii B.L.Turner
- Species Senecio richii A.Gray
- Species Senecio ricoensis Cuatrec.
- Species Senecio riddellii Torr. & A.Gray
- Species Senecio rigens L. accepted as Othonna parviflora P.J.Bergius
- Species Senecio rigescens Jacq. accepted as Senecio rosmarinifolius L.f.
- Species Senecio rigidifolius V.M.Badillo
- Species Senecio rigidus L.
- Species Senecio rigidus (Thunb.) H.Jacobsen
- Species Senecio ringens Steud.
- Species Senecio riograndensis Matzenb.
- Species Senecio riojanus Cabrera
- Species Senecio riomayensis B.L.Turner
- Species Senecio riotintis Cuatrec. accepted as Pentacalia riotintis (Cuatrec.) Cuatrec.
- Species Senecio riparius Salisb.
- Species Senecio riparius DC. accepted as Hubertia riparia (DC.) C.Jeffrey
- Species Senecio riparius Wallr. accepted as Jacobaea paludosa (L.) G.Gaertn., B.Mey. & Scherb.
- Species Senecio riskindii B.L.Turner & T.M.Barkley
- Species Senecio ritovegana B.L.Turner
- Species Senecio ritoveganus B.L.Turner
- Species Senecio rivalis Greenm.
- Species Senecio rivularis Borbás
- Species Senecio rivularis J.Rémy accepted as Senecio peripotamus C.Jeffrey
- Species Senecio rivularis (Waldst. & Kit.) DC. accepted as Tephroseris crispa (Jacq.) Rchb.
- Species Senecio robbinsii Oakes ex Rusby accepted as Packera schweinitziana (Nutt.) W.A.Weber & Á.Löve
- Species Senecio roberti-friesii K.Afzel. accepted as Senecio schweinfurthii O.Hoffm.
- Species Senecio robertiifolius DC.
- Species Senecio robinsonianus Greenm. accepted as Roldana robinsoniana (Greenm.) H.Rob. & Brettell
- Species Senecio roborowskii Maxim. accepted as Parasenecio roborowskii (Maxim.) Y.L.Chen
- Species Senecio robustus Sch.Bip.
- Species Senecio robustus Buchanan accepted as Brachyglottis revoluta (Kirk) B.Nord.
- Species Senecio roccatii Chiov. accepted as Senecio maranguensis O.Hoffm.
- Species Senecio rochelianus Fuss accepted as Senecio doronicum subsp. transylvanicus (Boiss.) Nyman
- Species Senecio rodolfoi X.Wu
- Species Senecio rodriguezii Willk. ex Rodrig.
- Species Senecio rodriguezii Willk. ex J.J.Rodr.
- Species Senecio rogersii S.Moore accepted as Emilia hockii (De Wild. & Muschl.) C.Jeffrey
- Species Senecio rolandi-bonaparte Wolf
- Species Senecio roldana DC.
- Species Senecio rollandii (Vict.) Vict. accepted as Senecio pseudoarnica Less.
- Species Senecio romeroi Cuatrec.
- Species Senecio romeroides (Cuatrec.) (Cuatrec.)
- Species Senecio romeroides Cuatrec.
- Species Senecio rooseveltianus De Wild. accepted as Senecio deltoideus Less.
- Species Senecio roripifolius Cabrera
- Species Senecio rorippifolius Cabrera
- Species Senecio rosanus Cuatrec.
- Species Senecio rosei Greenm.
- Species Senecio roseiflorus R.E.Fr.
- Species Senecio rosellatus Bojer
- Species Senecio rosellatus Bojer ex DC. accepted as Hubertia rosellata (Bojer ex DC.) C.Jeffrey
- Species Senecio roseoandinus Montesinos & R.Zárate
- Species Senecio roseus Sch.Bip.
- Species Senecio roseus Klatt accepted as Dendrophorbium longilinguae (Cuatrec.) C.Jeffrey
- Species Senecio rosinae Gamisans
- Species Senecio rosmarinifolius L.f.
- Species Senecio rosmarinus Phil.
- Species Senecio rossianus Mattf.
- Species Senecio rostellatus Steud.
- Species Senecio rosulatus Rydb. accepted as Packera fendleri (A.Gray) W.A.Weber & Á.Löve
- Species Senecio rosulifer H.Lév. & Vaniot accepted as Senecio laetus Edgew.
- Species Senecio rosuliferus Chang accepted as Sinosenecio changii (B.Nord.) B.Nord.
- Species Senecio rothrockii Greenm.
- Species Senecio rothschuhianus Greenm. accepted as Pseudogynoxys chenopodioides (Kunth) Cabrera
- Species Senecio rotundifolius Stokes accepted as Packera aurea (L.) Á.Löve & D.Löve
- Species Senecio rotundifolius Sessé & Moc. accepted as Roldana lobata La Llave
- Species Senecio rotundifolius (J.R.Forst & G.Forst) Hook.f. accepted as Brachyglottis rotundifolia J.R.Forst. & G.Forst.
- Species Senecio rotundifolius Lapeyr. accepted as Senecio doronicum (L.) L.
- Species Senecio rotundus (Britton) Small accepted as Packera obovata (Muhl. ex Willd.) W.A.Weber & Á.Löve
- Species Senecio rowleyanus H.Jacobsen
- Species Senecio rowleyanus M.Jacobs
- Species Senecio royleanus DC.
- Species Senecio rubens Juss. ex Jacq. accepted as Crassocephalum rubens var. rubens
- Species Senecio rubescens S.Moore accepted as Parasenecio rubescens (S.Moore) Y.L.Chen
- Species Senecio rubiginosus Elmer accepted as Gynura rubiginosa (Elmer)
- Species Senecio rubricaulis Greene
- Species Senecio rubrilacunae Cuatrec.
- Species Senecio rudbeckiaefolius Meyen & Walp.
- Species Senecio rudbeckiifolius Meyen & Walp.
- Species Senecio ruderalis Harv. accepted as Senecio madagascariensis Poir.
- Species Senecio rudis Turcz.
- Species Senecio rueppellii Sch.Bip. accepted as Senecio glaucus subsp. coronopifolius (Maire) C.Alexander
- Species Senecio rufescens DC.
- Species Senecio rufescens (Humb. & Bonpl.) Cuatrec. accepted as Culcitium rufescens Humb. & Bonpl.
- Species Senecio ruficaulis Greenm. & Cuatrec. accepted as Pentacalia ruficaulis (Greenm. & Cuatrec.) Cuatrec.
- Species Senecio ruficomus Franch. accepted as Ligularia ruficoma (Franch.) Hand.-Mazz.
- Species Senecio rufiglandulosis Colenso
- Species Senecio rufinervis DC.
- Species Senecio rufipilis Franch. accepted as Parasenecio rufipilis (Franch.) Y.L.Chen
- Species Senecio rufipilus Franch.
- Species Senecio rufohirsutus Cabrera accepted as Pentacalia rufohirsuta (Cabrera) Cuatrec.
- Species Senecio rufopilosulus De Wild. accepted as Crassocephalum montuosum (S.Moore) Milne-Redh.
- Species Senecio rufus Hand.-Mazz. accepted as Tephroseris rufa (Hand.-Mazz.) B.Nord.
- Species Senecio rugegensis Muschl.
- Species Senecio rugelia A.Gray accepted as Rugelia nudicaulis Shuttlew. ex Chapm.
- Species Senecio rugosus Cuatrec. accepted as Pentacalia rugosa (Cuatrec.) Cuatrec.
- Species Senecio ruiteranii Cuatrec. accepted as Pentacalia ruiteranii (Cuatrec.) Cuatrec.
- Species Senecio ruiz-lealii Cabrera
- Species Senecio rumicifolius Klatt
- Species Senecio rumicifolius MacOwan & Bolus
- Species Senecio rumicifolius J.R.Drumm. accepted as Ligularia rumicifolia (J.R.Drumm.) S.W.Liu
- Species Senecio runcinatus Less.
- Species Senecio runcinifolius J.H.Willis
- Species Senecio rupestris Waldst. & Kit. accepted as Senecio squalidus subsp. rupestris (Waldst. & Kit.) Greuter
- Species Senecio rupicola A.Rich.
- Species Senecio rupicolus Simonk.
- Species Senecio rusbyi Greene accepted as Senecio bigelovii var. bigelovii A.Gray
- Species Senecio rusisiensis R.E.Fr. accepted as Senecio hochstetteri Sch.Bip. ex A.Rich.
- Species Senecio rutaceus Phil.
- Species Senecio ruthenensis Mazuc & Timb.-Lagr.
- Species Senecio ruthenensis Maz. & Timb.
- Species Senecio rutshuruensis De Wild. accepted as Gynura scandens O.Hoffm.
- Species Senecio ruwenzoriensis S.Moore
- Species Senecio rydbergii A.Nelson accepted as Packera streptanthifolia (Greene) W.A.Weber & Á.Löve
- Species Senecio rzedowskii García-Pérez
- Species Senecio rzedowskii J.García Pérez
- Species Senecio sabinjoensis Muschl.
- Species Senecio saboureaui Humbert
- Species Senecio sabulosus DC. accepted as Senecio lingulatus (Willd. ex Schltdl.) Cuatrec.
- Species Senecio saccoflabellatus H.Lév. accepted as Ligularia hookeri (C.B.Clarke) Hand.-Mazz.
- Species Senecio saccoso-flabellatus H.Lév.
- Species Senecio sacramentanus Wooton & Standl.
- Species Senecio sadleri Láng ex Rchb.
- Species Senecio sadleri Sadler accepted as Jacobaea paludosa subsp. lanata (Holub) B.Nord. & Greuter
- Species Senecio sagitta Maxim. accepted as Ligularia sagitta (Maxim.) Mattf. ex Rehder & Kobuski
- Species Senecio sagittarioides Speg. accepted as Senecio bonariensis Hook. & Arn.
- Species Senecio sagittarius Sch.Bip.
- Species Senecio sagittatus Sch.Bip. accepted as Parasenecio hastatus var. hastatus
- Species Senecio sagittatus (Vahl) Hieron. accepted as Emilia coccinea (Sims) G.Don
- Species Senecio sagittifolius Arechav. accepted as Senecio mattfeldianus Cabrera
- Species Senecio sagittifolius Baker accepted as Senecio bonariensis Hook. & Arn.
- Species Senecio sailapatensis Cuatrec.
- Species Senecio sakalavorum Humbert
- Species Senecio sakamaliensis (Humbert) Humbert
- Species Senecio salicetorum Godr.
- Species Senecio salicifolia Pers.
- Species Senecio salicifolius Pers.
- Species Senecio salicifolius Wallr.
- Species Senecio salicinus Rydb. accepted as Packera fendleri (A.Gray) W.A.Weber & Á.Löve
- Species Senecio saliens Rydb. accepted as Senecio triangularis Hook.
- Species Senecio salignus DC. accepted as Barkleyanthus salicifolius (Kunth) H.Rob. & Brettell
- Species Senecio salisburgensis (Cufod.) Rauschert accepted as Tephroseris helenitis subsp. salisburgensis (Cuf.) B.Nord.
- Species Senecio salsuginea H.Duman & Vural
- Species Senecio salsuginosus Schischk.
- Species Senecio salsus Griseb. accepted as Senecio subulatus var. subulatus
- Species Senecio saltensis Hook. & Arn.
- Species Senecio saluenensis Diels
- Species Senecio saluenensis Diels ex Gagnep.
- Species Senecio salviifolius Sch.Bip.
- Species Senecio salzmannii Rouy
- Species Senecio samanensis Urb.
- Species Senecio samniticus accepted as Jacobaea samnitum (Nyman) B.Nord. & Greuter
- Species Senecio samnitum (Nyman) Greuter accepted as Jacobaea samnitum (Nyman) B.Nord. & Greuter
- Species Senecio sanagastae Cabrera
- Species Senecio sanctae-martae Greenm.
- Species Senecio sancti-sebastiani Sandwith accepted as Pentacalia polymera (Klatt) Cuatrec.
- Species Senecio sandemanii Cuatrec. accepted as Dendrophorbium multinerve (Sch.Bip. ex Klatt) C.Jeffrey
- Species Senecio sandersiana B.L.Turner
- Species Senecio sandersianus B.L.Turner
- Species Senecio sandersii B.L.Turner
- Species Senecio sandersonii Harv.
- Species Senecio sandrasicus P.H.Davis accepted as Jacobaea sandrasica (P.H.Davis) B.Nord. & Greuter
- Species Senecio sandwicensis Less.
- Species Senecio sandwithii Cabrera
- Species Senecio sangayensis D.L.A.Vásquez & J.Calvo
- Species Senecio sanguisorbae DC.
- Species Senecio sanguisorboides Rydb. accepted as Packera sanguisorboides (Rydb.) W.A.Weber & Á.Löve
- Species Senecio saniensis Hilliard & B.L.Burtt
- Species Senecio sanmarcosensis H.Beltrán
- Species Senecio santacrucensis Cabrera accepted as Senecio culcitenellus Cuatrec.
- Species Senecio santanderensis (Cuatrec.) Cuatrec.
- Species Senecio santarosae Greenm. accepted as Roldana schaffneri (Sch.Bip. ex Klatt) H.Rob. & Brettell
- Species Senecio santelicis Phil.
- Species Senecio santiagoensis Kuntze
- Species Senecio santiagoensis O. K.
- Species Senecio santurbanensis Cuatrec.
- Species Senecio saposhnikovii
- Species Senecio saracenicus W.D.J.Koch
- Species Senecio saracenicus Auct. ex Nyman
- Species Senecio sarawschanicus C.Winkl.
- Species Senecio sarcobasis Bojer ex DC.
- Species Senecio sarcoides C.Jeffrey
- Species Senecio sarcophyllus Steud.
- Species Senecio sarcophyllus Phil. accepted as Senecio bipontinii Wedd.
- Species Senecio sardous (Fiori) Arrigoni accepted as Senecio squalidus subsp. sardous (Fiori) Greuter
- Species Senecio sareptanus Gand.
- Species Senecio sariacus Beauverd accepted as Jacobaea gnaphalioides (Sieber ex Spreng.) Veldkamp
- Species Senecio sarmentosus Sch.Bip.
- Species Senecio sarmentosus (bl.) Sch.Bip. ex Schweinf.
- Species Senecio sarmentosus O.Hoffm. accepted as Senecio deltoideus Less.
- Species Senecio sarracenicus L.
- Species Senecio sarracenicus C.C.Gmel.
- Species Senecio sarracenicus Minderova accepted as Senecio ovatus (G.Gaertn., B.Mey. & Scherb.) Willd.
- Species Senecio sartorii Sch.Bip. ex Hemsl. accepted as Roldana sartorii (Sch.Bip. ex Hemsl.) H.Rob. & Brettell
- Species Senecio saruwagedensis Mattf. accepted as Papuacalia saruwagedensis (Mattf.) Veldkamp
- Species Senecio satipoensis Cuatrec.
- Species Senecio sattimae accepted as Senecio schweinfurthii O.Hoffm.
- Species Senecio saucensis Cabrera
- Species Senecio saugetii Alain
- Species Senecio saundersii W.Sauer & E.Beck
- Species Senecio saussureoides Hand.-Mazz.
- Species Senecio savatieri Franch.
- Species Senecio saxatilis Wall. ex DC.
- Species Senecio saxatilis Lomakin
- Species Senecio saxatilis Wall.
- Species Senecio saxatilis Lomak. accepted as Iranecio lipskyi C.Jeffrey
- Species Senecio saxicola Wedd.
- Species Senecio saxifragoides Hook.f. accepted as Brachyglottis saxifragoides (Hook.f.) B.Nord.
- Species Senecio saxipunae Cuatrec.
- Species Senecio saxosus Klatt accepted as Packera werneriifolia (A.Gray) W.A.Weber & Á.Löve
- Species Senecio scaber Willd.
- Species Senecio scaberulus (Hook.f.) D.G.Drury
- Species Senecio scabrellus I.Thomps.
- Species Senecio scabriusculus DC. accepted as Senecio pinnulatus Thunb.
- Species Senecio scabrosus Banks & Sol. ex Hook.f.
- Species Senecio scalaris Greene
- Species Senecio scandens Buch.-Ham. ex D.Don
- Species Senecio scandens L.
- Species Senecio scandens Juss. ex DC. accepted as Delairea odorata Lem.
- Species Senecio scandens Wall. accepted as Senecio buimalia Buch.-Ham. ex D.Don
- Species Senecio scanorensis L. ex Steud.
- Species Senecio scaphiformis Greenm. accepted as Pentacalia scaphiformis (Greenm.) Cuatrec.
- Species Senecio scapiflorus (L'Hér.) C.A.Sm.
- Species Senecio scapiformis Y.L.Chen & K.Y.Pan accepted as Senecio laetus Edgew.
- Species Senecio scapiger Sieber
- Species Senecio scapiger Spreng.
- Species Senecio scapigera Siebold ex Spreng.
- Species Senecio scapioides Aguilar-Cano & D.J.N.Hind
- Species Senecio scaposus DC.
- Species Senecio scaposus A.Nelson accepted as Packera werneriifolia (A.Gray) W.A.Weber & Á.Löve
- Species Senecio sceleratus Schweick. accepted as Senecio latifolius DC.
- Species Senecio schaffneri Sch.Bip. ex Klatt
- Species Senecio schaffneri Schultz
- Species Senecio schelkovnikovii Grossh.
- Species Senecio scheuchzeri Gaudin
- Species Senecio schimperi Sch.Bip. ex A.Rich.
- Species Senecio schimperi Sch.Bip. ex Hochst.
- Species Senecio schinzianus Muschl.
- Species Senecio schinzii O.Hoffm. ex Schinz
- Species Senecio schinzii O.Hoffm. accepted as Emilia ambifaria (S.Moore) C.Jeffrey
- Species Senecio schischkinianus Sofieva accepted as Jacobaea schischkiniana (Sofieva) B.Nord. & Greuter
- Species Senecio schischkinii Lipsch. ex Rubtz.
- Species Senecio schistosus Kharkev. accepted as Tephroseris schistosa (Kharkev.) Czerep.
- Species Senecio schizopetalus W.W.Sm. accepted as Ligularia stenoglossa (Franch.) Hand.-Mazz.
- Species Senecio schizophyllus Klatt
- Species Senecio schizotrichus Greenm.
- Species Senecio schizotrichus Greenm. ex Standl.
- Species Senecio schkuhrii DC.
- Species Senecio schlechtendahlii Mart. ex Baker accepted as Senecio brasiliensis (Spreng.) Less.
- Species Senecio schmidtii (Maxim.) Franch. & Sav. accepted as Ligularia schmidtii (Maxim.) Makino
- Species Senecio schoenemannii Phil.
- Species Senecio schoenleini Meigen accepted as Senecio pentaphyllus Phil.
- Species Senecio schoenleinii F.Meigen
- Species Senecio schonemanni Phil.
- Species Senecio schreiteri Cabrera
- Species Senecio schubotzianus Muschl. accepted as Cineraria deltoidea Sond.
- Species Senecio schultesii Hochst. ex Fielding & Gardner
- Species Senecio schultzii Hochst. ex A.Rich.
- Species Senecio schultzii Wedd. accepted as Senecio bipontinii Wedd.
- Species Senecio schulzeanus F.Meigen
- Species Senecio schumannianus S.Schauer accepted as Roldana lobata La Llave
- Species Senecio schvetzovii Korsh. accepted as Senecio macrophyllus M.Bieb.
- Species Senecio schweinfurthii O.Hoffm.
- Species Senecio schweinitzianus Nutt. accepted as Packera schweinitziana (Nutt.) W.A.Weber & Á.Löve
- Species Senecio schwetzowii Korsh.
- Species Senecio schyzotus (Cabrera) Iamonico
- Species Senecio sciadophilus Raoul accepted as Brachyglottis sciadophila (Raoul) B.Nord.
- Species Senecio sciatrephes W.W.Sm. accepted as Synotis sciatrephes (W.W.Sm.) C.Jeffrey & Y.L.Chen
- Species Senecio scitus Hutch. & Burtt Davy
- Species Senecio sclerophyllus Hemsl.
- Species Senecio sclerosus Cuatrec. accepted as Pentacalia sclerosa (Cuatrec.) Cuatrec.
- Species Senecio scoparius Harv.
- Species Senecio scoparius Phil. accepted as Senecio pemehuensis Soldano
- Species Senecio scopolii Hoppe & Hornsch.
- Species Senecio scopolii Hoppe & Hornsch. ex Bluff & Fingerh.
- Species Senecio scopulinus Greene
- Species Senecio scopulorum Poepp.
- Species Senecio scopulorum Poepp. & Endl.
- Species Senecio scopulosus Klatt
- Species Senecio scorpioides Sch.Bip.
- Species Senecio scortifolius Greenm. accepted as Pentacalia scortifolia (Greenm.) Cuatrec.
- Species Senecio scorzonella Greene
- Species Senecio scorzonerifolius Meyen & Walp.
- Species Senecio scorzoneroides Hook.f. accepted as Dolichoglottis scorzoneroides (Hook.f.) B.Nord.
- Species Senecio scotifolius Phil.
- Species Senecio scottii Balf.f. accepted as Kleinia scottii (Balf.f.) P.Halliday
- Species Senecio scribneri Rydb. accepted as Senecio integerrimus var. scribneri (Rydb.) T.M.Barkley
- Species Senecio scrobicaria DC.
- Species Senecio scrobicarioides DC.
- Species Senecio scrophulariifolius O.Hoffm. accepted as Senecio maranguensis O.Hoffm.
- Species Senecio scytophyllus Diels accepted as Cremanthodium coriaceum S.W.Liu
- Species Senecio scytophyllus Kunth accepted as Cremanthodium coriaceum S.W.Liu
- Species Senecio sechellensis Baker
- Species Senecio sectilis Griseb.
- Species Senecio sedifoleus Phil.
- Species Senecio sedifolius Phil. accepted as Senecio pachyphyllos J.Rémy
- Species Senecio seemannii Sch.Bip. accepted as Roldana hartwegii (Benth.) H.Rob. & Brettell
- Species Senecio segethii Phil.
- Species Senecio segmentatus Oliv. accepted as Lopholaena segmentata (Oliv.) S.Moore
- Species Senecio selloi (Spreng.) DC.
- Species Senecio semiamplexicaulis Rydb. accepted as Senecio crassulus A.Gray
- Species Senecio semiamplexifolius De Wild.
- Species Senecio semicordatus Mack. & Bush accepted as Packera pseudaurea var. semicordata (Mack. & Bush) Trock & T.M.Barkley
- Species Senecio semidentatus Klatt accepted as Pentacalia reflexa (Kunth) Cuatrec.
- Species Senecio seminiveus J.M.Wood & M.S.Evans
- Species Senecio seminudus Bory
- Species Senecio semperamatae T.M.Barkley accepted as Roldana ehrenbergiana (Klatt) H.Rob. & Brettell
- Species Senecio semperflorens Stokes
- Species Senecio sempervivus Sch.Bip.
- Species Senecio senecioides (Kunth) Kuntze
- Species Senecio sennikovii Kottaim.
- Species Senecio sepium Sch.Bip. ex Rusby
- Species Senecio sepium Sch.Bip. & Rusby
- Species Senecio sepium Sch.Bip. accepted as Senecio sepium Sch.Bip. ex Rusby
- Species Senecio septilobus Chang accepted as Sinosenecio septilobus B.Nord.
- Species Senecio serenensis J.Rémy accepted as Senecio brunonianus Hook. & Arn.
- Species Senecio seretii De Wild. accepted as Gynura scandens O.Hoffm.
- Species Senecio sericea (L.f.) DC. accepted as Senecio filaginoides var. lobulatus (Hook. & Arn.) Cabrera
- Species Senecio sericeo-nitens Speg.
- Species Senecio sericeus (Kunze) Kuntze
- Species Senecio seridophyllus Greene accepted as Senecio amplectens var. holmii (Greene) H.D.Harr.
- Species Senecio serpens G.D.Rowley accepted as Curio repens (L.) P.V.Heath
- Species Senecio serpentini Gáyer accepted as Tephroseris integrifolia subsp. serpentini (Gáyer) B.Nord.
- Species Senecio serpentinicola Jeanm.
- Species Senecio serra Hook.
- Species Senecio serra Schweinf. ex Engl.
- Species Senecio serra Sond. accepted as Senecio inornatus DC.
- Species Senecio serra Schweinf. accepted as Senecio schweinfurthii O.Hoffm.
- Species Senecio serranus Zardini
- Species Senecio serraquitchensis Greenm.
- Species Senecio serratifolius (Meyen & Walp.) Cuatrec.
- Species Senecio serratiformis I.Thomps.
- Species Senecio serratulifolius Weinm.
- Species Senecio serratuloides DC.
- Species Senecio serratus MacOwan & Bolus
- Species Senecio serratus Sond. accepted as Senecio incomptus DC.
- Species Senecio serratus (Thunb.) Sond. accepted as Senecio glanduloso-pilosus Volkens & Muschl.
- Species Senecio serrulatus DC.
- Species Senecio serrurioides Turcz.
- Species Senecio sessilifolius (Hook. & Arn.) Hemsl.
- Species Senecio sessilifolius Sch.Bip. accepted as Cremanthodium nanum (Decne.) W.W.Sm.
- Species Senecio sessilis Thunb. accepted as Senecio halimifolius L.
- Species Senecio sessilis Vell. accepted as Senecio adamantinus Bong.
- Species Senecio setchuenensis Franch. accepted as Synotis setchuanensis (Franch.) C.Jeffrey & Y.L.Chen
- Species Senecio setulosus Klatt
- Species Senecio setulosus Phil. accepted as Senecio tristis Phil.
- Species Senecio sevillanus Cuatrec. accepted as Pentacalia sevillana (Cuatrec.) Cuatrec.
- Species Senecio shabensis Lisowski
- Species Senecio shaferi Greenm.
- Species Senecio sheldonensis A.E.Porsild
- Species Senecio shelkovnikovi Grossh.
- Species Senecio shikokianus Makino
- Species Senecio shirleyanus Domin
- Species Senecio sibiricus C.B.Clarke
- Species Senecio sibiricus L.f.
- Species Senecio sibiricus Druce
- Species Senecio sibundoyensis Cuatrec. accepted as Dendrophorbium sibundoyense (Cuatrec.) C.Jeffrey
- Species Senecio sichotensis Kom.
- Species Senecio siculus Jan ex DC.
- Species Senecio siculus All. accepted as Senecio squalidus subsp. microglossus (Guss.) Arcang.
- Species Senecio sieberianus DC.
- Species Senecio sieboldii Sch.Bip.
- Species Senecio siegfriedii Brügger
- Species Senecio sieheanus Busch
- Species Senecio sikkimensis Franch. accepted as Ligularia hookeri (C.B.Clarke) Hand.-Mazz.
- Species Senecio silphifolius Harshb.
- Species Senecio silphiifolius (B.L.Rob. & Greenm.) García-Barr.
- Species Senecio silphiifolius (B.L.Rob. & Greenm.) J.García Pérez accepted as Psacalium silphiifolium (B.L.Rob. & Greenm.) H.Rob. & Brettell
- Species Senecio silphioides Hieron.
- Species Senecio silvani Cuatrec. accepted as Dendrophorbium silvani (Cuatrec.) C.Jeffrey
- Species Senecio silvascandens Cuatrec. accepted as Pentacalia silvascandens (Cuatrec.) Cuatrec.
- Species Senecio similiflorus Kolak. accepted as Caucasalia similiflora (Kolak.) B.Nord.
- Species Senecio simonsii C.B.Clarke accepted as Synotis simonsii (C.B.Clarke) C.Jeffrey & Y.L.Chen
- Species Senecio simplicissimus Bojer ex DC.
- Species Senecio simplicissimus Bojer
- Species Senecio simpsonii Phil.
- Species Senecio simulans Chiov. accepted as Solanecio cydoniifolius (O.Hoffm.) C.Jeffrey
- Species Senecio simulans Benoist accepted as Aequatorium jamesonii (S.F.Blake) C.Jeffrey
- Species Senecio sinapoides Rusby
- Species Senecio sinclairii (Benth.) Hieron. accepted as Pseudogynoxys sonchoides (Kunth) Cuatrec.
- Species Senecio sinforosii Cuatrec.
- Species Senecio sinicus (Diels) Chang accepted as Synotis sinica (Diels) C.Jeffrey & Y.L.Chen
- Species Senecio sinuatidens Peterm.
- Species Senecio sinuatilobus DC.
- Species Senecio sinuatus Kunth
- Species Senecio sinuatus Gilib.
- Species Senecio sipoccruncus Cabrera
- Species Senecio sipoccruncus Cabrera & Zardini
- Species Senecio sisymbriifolius DC.
- Species Senecio sisymbriifolius (auct. non DC.; Dinter) accepted as Mesogramma apiifolium DC.
- Species Senecio sisymbriifolius Dinter accepted as Mesogramma apiifolium DC.
- Species Senecio sisymbriiformis DC. accepted as Senecio analogus DC.
- Species Senecio skinneri Hemsl. accepted as Pseudogynoxys chenopodioides (Kunth) Cabrera
- Species Senecio skirrhodon DC.
- Species Senecio skottsbergii Cabrera
- Species Senecio slovacus Hodálová
- Species Senecio smallii Britton accepted as Packera anonyma W.A.Weber & Á.Löve
- Species Senecio smallii Britton ex Small & Vail accepted as Packera anonyma W.A.Weber & Á.Löve
- Species Senecio smithianus Cabrera
- Species Senecio smithii DC.
- Species Senecio smithioides Cabrera
- Species Senecio sneeuwbergensis Bolus accepted as Senecio inornatus DC.
- Species Senecio snowdenii Hutch.
- Species Senecio socialis Wedd. accepted as Senecio dryophyllus Meyen & Walp.
- Species Senecio sociorum Bolus
- Species Senecio socompae Cabrera
- Species Senecio sodiroi Hieron. ex Sodiro
- Species Senecio sodiroi Hieron. accepted as Pseudogynoxys sodiroi (Hieron.) Cuatrec.
- Species Senecio sodiroi (Hieron.) Cuatrec. accepted as Senecio imbaburensis Sklenář & Marhold
- Species Senecio sodirscandens Cuatrec.
- Species Senecio solanderi Allan
- Species Senecio solandri Allan accepted as Senecio rufiglandulosis Colenso
- Species Senecio solanifolius Jeffrey accepted as Senecio scandens Buch.-Ham. ex D.Don
- Species Senecio solanoides Sch.Bip.
- Species Senecio solanoides Sch.Bip. ex Asch. accepted as Solanecio tuberosus var. tuberosus
- Species Senecio soldanella A.Gray
- Species Senecio solenoides Dunn accepted as Nemosenecio solenoides (Dunn) B.Nord.
- Species Senecio solidagineus Spreng. accepted as Senecio halimifolius L.
- Species Senecio solidagineus Hand.-Mazz. accepted as Synotis solidaginea (Hand.-Mazz.) C.Jeffrey & Y.L.Chen
- Species Senecio solidaginoides P.J.Bergius accepted as Senecio halimifolius L.
- Species Senecio solidago Rydb. accepted as Senecio serra var. serra Hook.
- Species Senecio solidagoides Rydb.
- Species Senecio solisii Cuatrec. accepted as Dendrophorbium solisii (Cuatrec.) B.Nord.
- Species Senecio solitarius Rydb.
- Species Senecio somalensis Chiov. accepted as Gynura pseudochina (L.) DC.
- Species Senecio sonchifolius (L.) Moench accepted as Emilia sonchifolia (L.) DC. ex Wight
- Species Senecio sonchifolius (L.) J.C.Manning & Magoswana
- Species Senecio sonchoides Vuk.
- Species Senecio sonchoides Lojac. accepted as Senecio lividus L.
- Species Senecio sonchoides Kunth accepted as Pseudogynoxys sonchoides (Kunth) Cuatrec.
- Species Senecio songaricus Fisch.
- Species Senecio sonnei Greene
- Species Senecio sonneratii Steud.
- Species Senecio sonsonensis Cuatrec.
- Species Senecio soongaricus Fisch. accepted as Ligularia songarica (Fisch.) Ling
- Species Senecio sophioides DC.
- Species Senecio soratae Sch.Bip.
- Species Senecio sordidus Greenm.
- Species Senecio sorianoi Cabrera
- Species Senecio sororius C.Jeffrey
- Species Senecio sosnovskyi Sofieva accepted as Senecio leucanthemifolius subsp. caucasicus (DC.) Greuter
- Species Senecio sotarensis Hieron. accepted as Pentacalia sotarensis (Hieron.) Cuatrec.
- Species Senecio sotikensis S.Moore
- Species Senecio sotoanus Phil. accepted as Senecio gayanus DC.
- Species Senecio soukupii Cuatrec.
- Species Senecio souliei Franch. accepted as Parasenecio souliei (Franch.) Y.L.Chen
- Species Senecio southlandicus Cockayne accepted as Brachyglottis southlandica (Cockayne) B.Nord.
- Species Senecio spanomerus I.Thomps.
- Species Senecio sparsiflorus Steud.
- Species Senecio sparsifolius Bojer ex DC. accepted as Senecio adenodontus DC.
- Species Senecio sparsilobatus Parish accepted as Packera bernardina (Greene) W.A.Weber & Á.Löve
- Species Senecio spartareus S.Moore
- Species Senecio spartioides Torr. & A.Gray
- Species Senecio spathiphyllus Franch.
- Species Senecio spathulaefolius Turcz.
- Species Senecio spathulaefolius DC.
- Species Senecio spathulatus A.Rich.
- Species Senecio spathulifolius DC.
- Species Senecio spathulifolius Turcz.
- Species Senecio spathulifolius (C.C.Gmel.) Griess. accepted as Tephroseris helenitis (L.) B.Nord.
- Species Senecio spatulatus Jess.
- Species Senecio spatulifolius Kellogg
- Species Senecio spatuliformis A.Heller accepted as Packera macounii (Greene) W.A.Weber & Á.Löve
- Species Senecio speciosissimus J.C.Manning & Goldblatt
- Species Senecio speciosus Willd.
- Species Senecio spectabilis Wall.
- Species Senecio spectabilis Wall. ex DC. accepted as Senecio analogus DC.
- Species Senecio speculicola J.T.Howell
- Species Senecio spedeni Petrie
- Species Senecio spegazzinii Cabrera
- Species Senecio spelaeicola (Vaniot) Gagnep.
- Species Senecio spellenbergii T.M.Barkley accepted as Packera spellenbergii (T.M.Barkley) C.Jeffrey
- Species Senecio sphaerocephalus Greene
- Species Senecio sphagnolioides DC.
- Species Senecio spicatus Sweet
- Species Senecio spiculosus (Shepherd) G.D.Rowley
- Species Senecio spinescens Sch.Bip.
- Species Senecio spinosus DC.
- Species Senecio spiraeifolius Thunb.
- Species Senecio splendens H.Lév. & Vaniot
- Species Senecio spribillei W.A.Weber
- Species Senecio sprucei Britton accepted as Pentacalia brittoniana (Hieron.) Cuatrec.
- Species Senecio sprucei Klatt accepted as Pseudogynoxys poeppigii (DC.) H.Rob. & Cuatrec.
- Species Senecio squalidus L.
- Species Senecio squalidus Willd.
- Species Senecio squalidus d'Urv.
- Species Senecio squalidus M.Bieb.
- Species Senecio squamosus DC.
- Species Senecio squamosus Thunb. accepted as Senecio pubigerus L.
- Species Senecio squarrosus A.Rich.
- Species Senecio stabianus Lacaita accepted as Senecio ovatus subsp. stabianus (Lacaita) Greuter
- Species Senecio standleyi Greenm.
- Species Senecio stanleyi Hauman accepted as Dendrosenecio adnivalis var. petiolatus (Hedberg) E.B.Knox
- Species Senecio stapeliiformis E.Phillips accepted as Kleinia stapeliiformis (E.Phillips) Stapf
- Species Senecio stauntonii DC.
- Species Senecio steetzii Bolle accepted as Pericallis steetzii (Bolle) B.Nord.
- Species Senecio steinbachianus Cuatrec. accepted as Senecio epiphyticus Kuntze
- Species Senecio stella-purpurea V.R.Clark, J.D.Vidal & N.P.Barker
- Species Senecio stellatopilosus Cuatrec.
- Species Senecio stellatopilosus Greenm. & Cuatrec. accepted as Aequatorium stellatopilosum (Greenm. & Cuatrec.) C.Jeffrey
- Species Senecio stellato-pilosus Greenm. & Cuatrec.
- Species Senecio stellato-pilosus Greenm. & Bush
- Species Senecio stenactis Sch.Bip.
- Species Senecio stenocephalus Boiss. accepted as Pojarkovia pojarkovae (Schischk.) Greuter
- Species Senecio stenocephalus Maxim. accepted as Pojarkovia pojarkovae (Schischk.) Greuter
- Species Senecio stenodon Urb.
- Species Senecio stenoglossus Franch. accepted as Ligularia stenoglossa (Franch.) Hand.-Mazz.
- Species Senecio stenophyllus Bertero ex DC.
- Species Senecio stenophyllus Phil.
- Species Senecio stenophyllus Greenm.
- Species Senecio stenophyllus Bertero
- Species Senecio stenophyllus Simonk.
- Species Senecio stenopteris Griseb. accepted as Senecio deferens Griseb.
- Species Senecio steparius Cabrera
- Species Senecio sternbergianus DC. accepted as Aequatorium stellatopilosum (Greenm. & Cuatrec.) C.Jeffrey
- Species Senecio sterquilinus Ornduff
- Species Senecio steudelii Sch.Bip. ex A.Rich.
- Species Senecio steudelioides Sch.Bip.
- Species Senecio stewartiae J.B.Armstr. accepted as Brachyglottis stewartiae (J.B.Armstr.) B.Nord.
- Species Senecio steyermarkii Greenm.
- Species Senecio steyermarkii Cuatrec.
- Species Senecio stigophlebius Baker
- Species Senecio stigophlebius Cabrera accepted as Senecio stigophlebius Baker
- Species Senecio stipellatus O.Hoffm. ex Dusén
- Species Senecio stipellatus O.Hoffm. accepted as Senecio goldsacki Phil.
- Species Senecio stipulatus Wall.
- Species Senecio stipulatus Vell.
- Species Senecio stipulatus Wall. ex DC. accepted as Senecio scandens var. scandens
- Species Senecio stirthii Phil.
- Species Senecio stoechadiformis DC.
- Species Senecio stokesii F.Br.
- Species Senecio stolonifer Cufod. accepted as Tephroseris stolonifera (Cufod.) Holub
- Species Senecio stolzii Mattf. accepted as Senecio inornatus DC.
- Species Senecio storkii Cuatrec.
- Species Senecio streptanthifolius Greene accepted as Packera streptanthifolia (Greene) W.A.Weber & Á.Löve
- Species Senecio streptothamnus Greenm. ex Standl.
- Species Senecio streptothamnus Greenm. accepted as Pentacalia streptothamna (Greenm. ex Standl.) H.Rob. & Cuatrec.
- Species Senecio striatifolius DC.
- Species Senecio striatus Thunb. accepted as Osteospermum bidens Thunb.
- Species Senecio strictifolius Hiern
- Species Senecio strictus DC.
- Species Senecio strictus Banks ex Pursh
- Species Senecio stuebelii Hieron. accepted as Pentacalia stuebelii (Hieron.) Cuatrec.
- Species Senecio stuhlmannii Klatt accepted as Solanecio cydoniifolius (O.Hoffm.) C.Jeffrey
- Species Senecio stygius Greene accepted as Packera multilobata (Torr. & A.Gray ex A.Gray) W.A.Weber & Á.Löve
- Species Senecio stylosus N.P.Balakr. accepted as Kleinia walkeri (C.B.Clarke) Uniyal
- Species Senecio stylotrichus Cabrera
- Species Senecio suaveolens Gilib.
- Species Senecio suaveolens (L.) Elliott accepted as Hasteola suaveolens (L.) Pojark.
- Species Senecio suavis Lunell
- Species Senecio suazaensis Cuatrec.
- Species Senecio subalatipetiolatus De Wild. accepted as Gynura scandens O.Hoffm.
- Species Senecio subalpinus K.Koch
- Species Senecio subalpinus W.D.J.Koch accepted as Jacobaea subalpina (W.D.J.Koch) Pelser & Veldkamp
- Species Senecio subarachnoideus Sch.Bip. ex Wedd. accepted as Pentacalia subarachnoidea (Wedd.) Cuatrec.
- Species Senecio subaraneosus Sch.Bip. accepted as Cissampelopsis volubilis (Blume) Miq.
- Species Senecio subarnicoides Cabrera
- Species Senecio subauriculatus Greenm.
- Species Senecio subauritus Phil.
- Species Senecio subcandidus A.Gray
- Species Senecio subcanescens (DC.) Compton
- Species Senecio subcarnosulus De Wild. accepted as Senecio maranguensis O.Hoffm.
- Species Senecio subcordatus Bojer ex DC.
- Species Senecio subcoriaceus Schltr.
- Species Senecio subcorymbosus Rupr. ex Boiss.
- Species Senecio subcrassifolius De Wild. accepted as Senecio hadiensis Forssk.
- Species Senecio subculcitioides Cuatrec.
- Species Senecio subcuneatus Rydb. accepted as Packera streptanthifolia (Greene) W.A.Weber & Á.Löve
- Species Senecio subcymosus (H.Rob.) B.L.Turner & T.M.Barkley
- Species Senecio subdecurrens Sch.Bip. ex Wedd. accepted as Senecio tephrosioides Turcz.
- Species Senecio subdecurrens Sch.Bip. accepted as Senecio tephrosioides Turcz.
- Species Senecio subdentatus (Bunge) Ledeb. accepted as Senecio glaucus subsp. coronopifolius (Maire) C.Alexander
- Species Senecio subdentatus Phil. accepted as Senecio linaresensis Soldano
- Species Senecio subdentatus (Bunge) Turcz. accepted as Tephroseris subdentata (Bunge) Holub
- Species Senecio subdiscoideus Sch.Bip. ex Wedd.
- Species Senecio subdiscoideus Sch.Bip.
- Species Senecio subensiformis DC.
- Species Senecio subfloccosus Schischk. accepted as Tephroseris cladobotrys subsp. subfloccosa (Schischk.) Greuter
- Species Senecio subfractiflexus C.Jeffrey
- Species Senecio subfrigidus Kom.
- Species Senecio subglomerosus Greenm. accepted as Pentacalia subglomerosa (Greenm.) Cuatrec.
- Species Senecio subinteger Rouy
- Species Senecio subinvolucratus Cuatrec.
- Species Senecio sublobatus DC.
- Species Senecio sublutescens Cuatrec.
- Species Senecio sublyratus Phil.
- Species Senecio submontanus Hilliard & B.L.Burtt
- Species Senecio submultinervis Cuatrec. accepted as Dendrophorbium multinerve (Sch.Bip. ex Klatt) C.Jeffrey
- Species Senecio subnebrodensis Simonk.
- Species Senecio subnemoralis Dusén
- Species Senecio subnivalis Ajani, Noroozi & B.Nord.
- Species Senecio subnudus DC. accepted as Packera subnuda (DC.) Trock & T.M.Barkley
- Species Senecio suboppositifolius Cuatrec.
- Species Senecio subpanduratus O.Hoffm.
- Species Senecio subpanduratus O.Hoffm. ex Dusén
- Species Senecio subpeltatus Sch.Bip.
- Species Senecio subpeltatus Steud. accepted as Senecio oxyriifolius DC.
- Species Senecio subpetitianus Baker accepted as Senecio syringifolius O.Hoffm.
- Species Senecio subpubescens Cabrera
- Species Senecio subradiatus (DC.) Sch.Bip. accepted as Senecio cicatricosus Sch.Bip.
- Species Senecio subrosulatus Hand.-Mazz. accepted as Sinosenecio subrosulatus (Hand.-Mazz.) B.Nord.
- Species Senecio subrubriflorus O.Hoffm.
- Species Senecio subruncinatus (Wedd.) Greenm.
- Species Senecio subruncinatus Pennell
- Species Senecio subscandens Hochst. ex A.Rich. accepted as Solanecio angulatus (Vahl) C.Jeffrey
- Species Senecio subscaposus Kom. accepted as Tephroseris subscaposa (Kom.) Czerep.
- Species Senecio subsessilis Oliv. & Hiern
- Species Senecio subsinuatus DC.
- Species Senecio subspicatus Bureau & Franch. accepted as Ligularia subspicata (Bureau & Franch.) Hand.-Mazz.
- Species Senecio subsquarrosus Greenm.
- Species Senecio subulatifolius G.D.Rowley accepted as Kleinia picticaulis (P.R.O.Bally) C.Jeffrey
- Species Senecio subulatus (P.R.O.Bally) H.Jacobsen
- Species Senecio subulatus D.Don ex Hook. & Arn. accepted as Senecio subulatus var. subulatus
- Species Senecio subumbellatus Phil.
- Species Senecio subverticillatus DC.
- Species Senecio subvestitus Howell
- Species Senecio subvulgaris Kuntze accepted as Senecio dryophyllus Meyen & Walp.
- Species Senecio succisifolius Kom. accepted as Tephroseris integrifolia (L.) Holub
- Species Senecio succulentus Forssk.
- Species Senecio succulentus DC. accepted as Senecio sarcoides C.Jeffrey
- Species Senecio succulentus Sch.Bip. accepted as Kleinia repens (L.) Haw.
- Species Senecio sudeticus DC.
- Species Senecio suffultus (Greenm.) McVaugh
- Species Senecio sukaczevii Schischk.
- Species Senecio suksdorfii Greenm. accepted as Packera streptanthifolia (Greene) W.A.Weber & Á.Löve
- Species Senecio sulcatus DC. accepted as Senecio crispus Thunb.
- Species Senecio sulcicalyx Baker
- Species Senecio sulcicalyx N.E.Br.
- Species Senecio sulinicus Cabrera
- Species Senecio sulphureus (Baumg.) Simonk. accepted as Tephroseris papposa (Rchb.) Schur
- Species Senecio sumarae Deflers
- Species Senecio sumatranus Martelli
- Species Senecio summapacis Cuatrec. accepted as Pentacalia summapacis (Cuatrec.) Cuatrec.
- Species Senecio summus Cuatrec. accepted as Senecio comosus var. culcitioides (Sch.Bip.) Cabrera
- Species Senecio sumneviczii Schischk. & Serg.
- Species Senecio sundbergii B.L.Turner accepted as Roldana sundbergii (B.L.Turner) B.L.Turner
- Species Senecio sundti Phil.
- Species Senecio sundtii Phil.
- Species Senecio sungpanensis Hand.-Mazz. accepted as Sinosenecio sungpanensis (Hand.-Mazz.) B.Nord.
- Species Senecio superandinus Cuatrec.
- Species Senecio superbus De Wild. & Muschl. accepted as Kleinia abyssinica var. abyssinica
- Species Senecio supernitens Cuatrec.
- Species Senecio supremus Cuatrec.
- Species Senecio surculosus MacOwan
- Species Senecio surinamensis Urb.
- Species Senecio swartzianus H.Buek
- Species Senecio swartzianus Bueck. accepted as Odontocline laciniata (Sw.) B.Nord.
- Species Senecio swartzii DC. accepted as Odontocline glabra (Sw.) B.Nord.
- Species Senecio swaziensis Compton accepted as Senecio glaberrimus DC.
- Species Senecio sweetii Heynh.
- Species Senecio swynnertonii S.Moore
- Species Senecio sycephalus S.Moore accepted as Senecio transmarinus var. sycephalus (S.Moore)
- Species Senecio sycephyllus S.Moore
- Species Senecio sykorae Montesinos
- Species Senecio sylvarum Sch.Bip. accepted as Senecio herrerae Cabrera
- Species Senecio sylvaticus L.
- Species Senecio sylvaticus Gueldenst.
- Species Senecio sylvaticus Nestl. ex DC.
- Species Senecio sylvestris Grindel.
- Species Senecio sylvicola Greenm.
- Species Senecio sylvicolus Greenm. accepted as Pentacalia sylvicola (Greenm.) Cuatrec.
- Species Senecio sympodialis R.E.Fr. accepted as Senecio jacksonii S.Moore
- Species Senecio syneilesis Franch. & Sav.
- Species Senecio syringifolius O.Hoffm.
- Species Senecio syrmiensis Kit. ex Nyman
- Species Senecio szyszylowiczii Hieron.
- Species Senecio tabacifolius Rusby accepted as Dendrophorbium tabacifolium (Rusby) C.Jeffrey
- Species Senecio tabacina Turcz.
- Species Senecio tabacon Turcz. accepted as Senecio wedglacialis Cuatrec.
- Species Senecio tabidus Banks & Sol. ex Hook.f.
- Species Senecio tablensis Cabrera accepted as Pentacalia tablensis (Cabrera) Cuatrec.
- Species Senecio tabularis Sch.Bip.
- Species Senecio tabularis Hemsl. accepted as Psacalium tabulare Rydb.
- Species Senecio tabulicola Baker
- Species Senecio tacorensis Cabrera
- Species Senecio tacuaremboensis Arechav.
- Species Senecio tafiensis Cabrera accepted as Senecio hieronymi Griseb.
- Species Senecio taimyrensis (Regel) gorodk. & Tichomirov
- Species Senecio taimyrensis (Herder) Gorodkov ex B.A.Tikhom. accepted as Tephroseris integrifolia subsp. atropurpurea (Ledeb.) B.Nord.
- Species Senecio taitoensis Hayata accepted as Tephroseris taitoensis (Hayata) Holub
- Species Senecio taitungensis S.S.Ying
- Species Senecio taiwanensis Hayata accepted as Senecio nemorensis L.
- Species Senecio takedanus Kitam.
- Species Senecio taliensis Franch. accepted as Parasenecio taliensis (Franch.) Y.L.Chen
- Species Senecio talinoides Sch.Bip.
- Species Senecio talongensis Franch. accepted as Synotis erythropappa (Bureau & Franch.) C.Jeffrey & Y.L.Chen
- Species Senecio talquinus Phil.
- Species Senecio tamaensis Cuatrec. accepted as Pentacalia trianae (Klatt) Cuatrec.
- Species Senecio tamoides DC.
- Species Senecio tampicanus DC.
- Species Senecio tampicanus A.Gray
- Species Senecio tanacetoides Sond. ex Harv. & Sond.
- Species Senecio tanacetoides Kunth & C.D.Bouché
- Species Senecio tanacetoides Sond. ex Harv. accepted as Senecio tanacetopsis Hilliard
- Species Senecio tanacetoides Kunth & Bouché accepted as Senecio royleanus DC.
- Species Senecio tanacetopsis Hilliard
- Species Senecio tandilensis Cabrera
- Species Senecio tanganyikensis R.E.Fr. accepted as Mikaniopsis tanganyikensis (R.E.Fr.) Milne-Redh.
- Species Senecio tanguticus Maxim. accepted as Sinacalia tangutica (Maxim.) B.Nord.
- Species Senecio tanzaniensis Cufod. accepted as Senecio deltoideus Less.
- Species Senecio tapianus B.L.Turner
- Species Senecio taquetii H.Lév. accepted as Ligularia mongolica (Turcz.) DC.
- Species Senecio tarapacanus Phil. accepted as Senecio dryophyllus Meyen & Walp.
- Species Senecio tarapotensis Cabrera accepted as Pentacalia tarapotensis (Cabrera) Cuatrec.
- Species Senecio taraxacifolius (M.Bieb.) DC. accepted as Iranecio taraxacifolius (M.Bieb.) C.Jeffrey
- Species Senecio taraxacoides (A.Gray) Greene
- Species Senecio tarijensis Cabrera
- Species Senecio tarokoensis C.I Peng
- Species Senecio tasconensis Martrin-Donos
- Species Senecio tashiroi Hayata accepted as Tephroseris kirilowii (Turcz. ex DC.) Holub
- Species Senecio tasimensis Franch. ex Koidz.
- Species Senecio tasmanicus I.Thomps.
- Species Senecio tasna Welw. ex Willk. & Lange
- Species Senecio tassaensis Montesinos
- Species Senecio tataricus Less. accepted as Jacobaea paludosa subsp. lanata (Holub) B.Nord. & Greuter
- Species Senecio tatsienensis Bureau & Franch. accepted as Ligularia pleurocaulis (Franch.) Hand.-Mazz.
- Species Senecio tatsiensis Bureau & Franch.
- Species Senecio tauricolus V.A.Matthews
- Species Senecio tauricus Konechn.
- Species Senecio taxifolius Pers.
- Species Senecio taxifolius Poir.
- Species Senecio taygeteus Boiss. & Heldr. accepted as Jacobaea ambigua subsp. taygetea (Boiss. & Heldr.) B.Nord. & Greuter
- Species Senecio tchangchanensis Franch.
- Species Senecio tchihatchewii Boiss.
- Species Senecio tedliei Oliv. & Hiern accepted as Mikaniopsis tedliei (Oliv. & Hiern) C.D.Adams
- Species Senecio tehuelches (Speg.) Cabrera
- Species Senecio teixeirae Torre
- Species Senecio telekii (Schweinf.) O.Hoffm.
- Species Senecio telembinus Cuatrec. accepted as Garcibarrigoa telembina (Cuatrec.) Cuatrec.
- Species Senecio telephifolius Jacq.
- Species Senecio teliformis Greenm.
- Species Senecio telmateius Hilliard
- Species Senecio telmatophilus O.Hoffm.
- Species Senecio telmatophyllus O.Hoffm. accepted as Crassocephalum uvens (Hiern) S.Moore
- Species Senecio telonensis Albert
- Species Senecio tenellulus S.Moore accepted as Emilia tenellula (S.Moore) C.Jeffrey
- Species Senecio tenellus DC.
- Species Senecio tener O.Hoffm. accepted as Emilia tenera (O.Hoffm.) C.Jeffrey
- Species Senecio teneriffae Sch.Bip.
- Species Senecio teneriffae Sch.Bip. ex Bolle
- Species Senecio tenorei Pignatti accepted as Senecio scopolii subsp. floccosus (Bertol.) Greuter
- Species Senecio tenuicaulis Muschl.
- Species Senecio tenuicaulis Sch.Bip. ex Klatt
- Species Senecio tenuicaulis Phil.
- Species Senecio tenuicaulis Sch.Bip. accepted as Senecio tenuicaulis Sch.Bip. ex Klatt
- Species Senecio tenuiculus Steud.
- Species Senecio tenuiflorus (DC.) Sieber ex Sch.Bip.
- Species Senecio tenuiflorus Sieber ex DC.
- Species Senecio tenuifolius Burm.f.
- Species Senecio tenuifolius DC.
- Species Senecio tenuifolius Jacq. accepted as Jacobaea erucifolia subsp. tenuifolia (J.Presl & C.Presl) B.Nord. & Greuter
- Species Senecio tenuilobus DC. accepted as Senecio umbellatus L.
- Species Senecio tenuipes Franch. accepted as Ligularia tenuipes (Franch.) Diels
- Species Senecio tenuisagittatus Cuatrec.
- Species Senecio tenuiscapus Bojer
- Species Senecio tenuiscapus Bojer ex DC. accepted as Senecio simplicissimus Bojer ex DC.
- Species Senecio tephrosioides Turcz.
- Species Senecio tepopanus B.L.Turner accepted as Roldana tepopana (B.L.Turner) B.L.Turner
- Species Senecio tercentenariae Proctor accepted as Odontocline tercentenariae (Proctor) B.Nord.
- Species Senecio teretifolius Less. ex Klatt
- Species Senecio teretifolius (Kunth) DC. accepted as Pentacalia teretifolia (Kunth) Cuatrec.
- Species Senecio tergolanatus Cuatrec.
- Species Senecio tergopurpureus Cuatrec.
- Species Senecio tessmannii Mattf. accepted as Emilia tessmannii (Mattf.) C.Jeffrey
- Species Senecio tetrandrus Buch.-Ham. ex DC.
- Species Senecio tetrandrus Buch.-Ham. ex Wall.
- Species Senecio tetranthus DC. accepted as Synotis tetrantha (DC.) C.Jeffrey & Y.L.Chen
- Species Senecio thamathuensis Hilliard
- Species Senecio thapsoides DC.
- Species Senecio theaefolius Benth. accepted as Pentacalia theifolia (Benth.) Cuatrec.
- Species Senecio theifolius Benth.
- Species Senecio theodori K.Afzel. accepted as Senecio schweinfurthii O.Hoffm.
- Species Senecio theresiae O.Hoffm.
- Species Senecio theresiae Hoffm.
- Species Senecio thermarum Bolus accepted as Emilia transvaalensis (Bolus) C.Jeffrey
- Species Senecio thermarum Phil. accepted as Senecio subumbellatus Phil.
- Species Senecio thianschanicus Regel & Schmalh.
- Species Senecio thinophilus Phil. accepted as Senecio troncosii Phil.
- Species Senecio thomasii Klatt accepted as Senecio deppeanus Hemsl.
- Species Senecio thompsoniensis Greenm.
- Species Senecio thomsianus Muschl. accepted as Senecio subsessilis Oliv. & Hiern
- Species Senecio thomsonii C.B.Clarke accepted as Ligularia thomsonii (C.B.Clarke) Pojark.
- Species Senecio thorbeckei Mattf.
- Species Senecio thornberi Greenm. accepted as Packera multilobata (Torr. & A.Gray ex A.Gray) W.A.Weber & Á.Löve
- Species Senecio thsiturungensis De Wild.
- Species Senecio thunbergianus Schrad.
- Species Senecio thunbergii Harv.
- Species Senecio thurberi A.Gray accepted as Packera neomexicana var. neomexicana (A.Gray) W.A.Weber & Á.Löve
- Species Senecio thuretii Briq. & Cavill.
- Species Senecio thurifer Bertero ex DC.
- Species Senecio thurifer (Decne.) Pelser
- Species Senecio thyrsoideus (DC.) G.Don accepted as Senecio barbatus DC.
- Species Senecio thyrsoideus DC. accepted as Senecio barbatus DC.
- Species Senecio thyrsophorus K.Koch accepted as Senecio racemosus (M.Bieb.) DC.
- Species Senecio tibatiensis Mattf.
- Species Senecio tibeticus Hook.f.
- Species Senecio tichomirovii Schischk.
- Species Senecio ticsanicus Montesinos & Trinidad
- Species Senecio tilcarensis Cabrera
- Species Senecio tillandsiaefolius Poepp. ex DC.
- Species Senecio tillandsiifolius Poepp. ex DC.
- Species Senecio timidus Cuatrec.
- Species Senecio tinctolobus I.M.Johnst.
- Species Senecio tingoensis Cabrera & Zardini
- Species Senecio tipocochensis Domke accepted as Dendrophorbium tipocochense (Domke) B.Nord.
- Species Senecio tiroliensis Dalla Torre accepted as Jacobaea abrotanifolia subsp. tiroliensis (Dalla Torre) B.Nord. & Greuter
- Species Senecio tmoleus Boiss.
- Species Senecio tocomarensis Cabrera
- Species Senecio tocomarensis Cabrera & Zardini
- Species Senecio toconaoensis J.Calvo & A.Moreira
- Species Senecio tocornalii Phil.
- Species Senecio toiyabensis S.L.Welsh & Goodrich accepted as Senecio spartioides Torr. & A.Gray
- Species Senecio toledoi Cabrera
- Species Senecio tolimensis (Sch.Bip. ex Wedd.) C.Jeffrey
- Species Senecio tolimensis Sch.Bip. ex Wedd. accepted as Pentacalia tolimensis (Sch.Bip. ex Wedd.) Cuatrec.
- Species Senecio toluccanus DC.
- Species Senecio tomasianus Cuatrec. accepted as Pentacalia tomasiana (Cuatrec.) Cuatrec.
- Species Senecio tomentosa
- Species Senecio tomentosus Cordem.
- Species Senecio tomentosus Host
- Species Senecio tomentosus [Clairv.]
- Species Senecio tomentosus Rohde ex DC.
- Species Senecio tomentosus Dulac
- Species Senecio tomentosus (Wight) C.B.Clarke accepted as Senecio edgeworthii Hook.f.
- Species Senecio tomentosus Salisb. accepted as Senecio cinerascens Aiton
- Species Senecio tomentosus Michx. accepted as Packera tomentosa (Michx.) C.Jeffrey
- Species Senecio tonduzii Greenm.
- Species Senecio tongoensis De Wild. accepted as Senecio hochstetteri Sch.Bip. ex A.Rich.
- Species Senecio tongolensis Franch. accepted as Ligularia tongolensis (Franch.) Hand.-Mazz.
- Species Senecio tongtchouanensis H.Lév. accepted as Ligularia lapathifolia (Franch.) Hand.-Mazz.
- Species Senecio tonii B.L.Turner
- Species Senecio topkegolensis Kitam.
- Species Senecio toreadoris Cuatrec. accepted as Dendrophorbium pericaule (Greenm.) B.Nord.
- Species Senecio toroanus Cabrera
- Species Senecio toromarensis Cabrera & Zardini
- Species Senecio torrehuasensis Cuatrec.
- Species Senecio torticaulis Merxm.
- Species Senecio tortuosus DC.
- Species Senecio toumeyi Greene accepted as Packera neomexicana var. toumeyi (Greene) Trock & T.M.Barkley
- Species Senecio tournefortii Lapeyr. accepted as Senecio pyrenaicus L.
- Species Senecio tovari Cabrera
- Species Senecio tovarii Cabrera
- Species Senecio townsendii Greenm.
- Species Senecio toxotis C.Jeffrey
- Species Senecio tozanensis Hayata accepted as Senecio nemorensis L.
- Species Senecio trachycarpus Sch.Bip.
- Species Senecio trachylaenus Harv.
- Species Senecio trachylepus Klatt
- Species Senecio trachyphyllus Schltr.
- Species Senecio tracyi Rydb. accepted as Packera crocata (Rydb.) W.A.Weber & Á.Löve
- Species Senecio trafulensis Cabrera
- Species Senecio transiens (Rouy) Jeanm.
- Species Senecio transilvanicus Schur
- Species Senecio transmarinus S.Moore
- Species Senecio transvaalensis Bolus accepted as Emilia transvaalensis (Bolus) C.Jeffrey
- Species Senecio transylvanicus Boiss. accepted as Senecio doronicum subsp. transylvanicus (Boiss.) Nyman
- Species Senecio trapezuntinus Boiss. accepted as Jacobaea trapezuntina (Boiss.) B.Nord.
- Species Senecio trautvetteri Maximova accepted as Tephroseris integrifolia subsp. atropurpurea (Ledeb.) B.Nord.
- Species Senecio traversii F.Muell. accepted as Brachyglottis traversii (F.Muell.) B.Nord.
- Species Senecio tredecimsquamosus Sch.Bip.
- Species Senecio tremolsii Sennen & Pau
- Species Senecio triactinus S.Moore
- Species Senecio trianae Klatt accepted as Pentacalia trianae (Klatt) Cuatrec.
- Species Senecio triangularis Hook.
- Species Senecio trianii Klatt
- Species Senecio trianthemos O.Hoffm. accepted as Lopholaena trianthema (O.Hoffm.) B.L.Burtt
- Species Senecio tricephalus Kuntze
- Species Senecio tricephalus Klatt ex Greenm.
- Species Senecio trichocaulon Baker
- Species Senecio trichochocaulon Baker
- Species Senecio trichocodon Baker
- Species Senecio trichopodus H.Lév.
- Species Senecio trichopterygius Muschl. accepted as Senecio subsessilis Oliv. & Hiern
- Species Senecio trichopus (Benth.) Greenm. accepted as Pentacalia trichopus (Benth.) Cuatrec.
- Species Senecio trichopus Benth. accepted as Pentacalia trichopus (Benth.) Cuatrec.
- Species Senecio trichotomus Greenm.
- Species Senecio tricuspidatus Hook. & Arn.
- Species Senecio tricuspidatus Banks & Sol. ex Hook.f.
- Species Senecio tricuspis Franch.
- Species Senecio tridentatus DC.
- Species Senecio tridenticulatus Rydb. accepted as Packera tridenticulata (Rydb.) W.A.Weber & Á.Löve
- Species Senecio trifidus Hook. & Arn.
- Species Senecio trifidus Larrañaga
- Species Senecio triflorus L.
- Species Senecio trifurcatus (G.Forst.) Less.
- Species Senecio trifurcatus Klatt accepted as Senecio triodontiphyllus C.Jeffrey
- Species Senecio trifurcifolius Hieron.
- Species Senecio trigonophyllus Greene
- Species Senecio trigynus Cuatrec. accepted as Dendrophorbium trigynum (Cuatrec.) H.Beltrán
- Species Senecio triligulatus Buch.-Ham. ex D.Don
- Species Senecio trilobus L.
- Species Senecio trinervius Chang accepted as Sinosenecio trinervius B.Nord.
- Species Senecio trineurus Griseb.
- Species Senecio triodon Phil.
- Species Senecio triodontiphyllus C.Jeffrey
- Species Senecio tripartitus A.Rich.
- Species Senecio tripartitus DC. accepted as Senecio brasiliensis (Spreng.) Less.
- Species Senecio tripetaloides Colenso accepted as Brachyglottis perdicioides (Hook.f.) B.Nord.
- Species Senecio tripinnatifidus Reiche
- Species Senecio triplinervius DC.
- Species Senecio triplipartitus Steud.
- Species Senecio triqueter DC.
- Species Senecio triqueter Less.
- Species Senecio tristis Phil.
- Species Senecio trixioides Greenm. accepted as Pseudogynoxys chenopodioides (Kunth) Cabrera
- Species Senecio trixoides Gardner accepted as Hoehnephytum trixoides (Gardner) Cabrera
- Species Senecio troncosi Phil.
- Species Senecio troncosii Phil.
- Species Senecio tropaeolifolius MacOwan ex F.Muell.
- Species Senecio tropaeolifolius O.Hoffm. accepted as Senecio milanjianus S.Moore
- Species Senecio tropicalis Cabrera ex G.M.Barroso
- Species Senecio tropicalis Cabrera accepted as Pentacalia tropicalis (Cabrera) C.Jeffrey
- Species Senecio trullifolius MacOwan
- Species Senecio truncatus Buch.-Ham. ex Wall.
- Species Senecio truncatus Dulac
- Species Senecio truxillensis Cabrera
- Species Senecio tsangsgchanensis Franch. accepted as Ligularia tsangchanensis (Franch.) Hand.-Mazz.
- Species Senecio tsaratananensis Humbert
- Species Senecio tschabanicus K.Koch
- Species Senecio tshabaensis De Wild. accepted as Senecio caudatus DC.
- Species Senecio tshitirungensis De Wild. accepted as Senecio hochstetteri Sch.Bip. ex A.Rich.
- Species Senecio tsimihety Humbert accepted as Hubertia tsimihety (Humbert) C.Jeffrey
- Species Senecio tsoongianus Ling accepted as Synotis cappa (Buch.-Ham. ex D.Don) C.Jeffrey & Y.L.Chen
- Species Senecio tuberculatus Ali
- Species Senecio tuberivagus W.W.Sm. accepted as Sinacalia davidii (Franch.) H.Koyama
- Species Senecio tuberosus (DC.) Harv.
- Species Senecio tuberosus Sch.Bip. ex A.Rich. accepted as Solanecio tuberosus var. tuberosus
- Species Senecio tubicapillosus Cuatrec.
- Species Senecio tubicaulis Mansf. accepted as Tephroseris palustris (L.) Rchb.
- Species Senecio tucumanensis Cabrera
- Species Senecio tuestae Cuatrec. accepted as Nordenstamia tuestae (Cuatrec.) B.Nord.
- Species Senecio tugelensis J.M.Wood & M.S.Evans
- Species Senecio tunamensis Cuatrec. accepted as Pentacalia tunamensis (Cuatrec.) Cuatrec.
- Species Senecio tundricola Tolm. accepted as Tephroseris integrifolia subsp. tundricola (Tolm.) B.Nord.
- Species Senecio tunicatus Kuntze accepted as Senecio magellanicus Hook. & Arn.
- Species Senecio tupungati Hauman accepted as Senecio tricephalus Kuntze
- Species Senecio tupungatoi Hauman
- Species Senecio turbinatus Rydb.
- Species Senecio turczaninovii DC. accepted as Tephroseris turczaninovii (DC.) Holub
- Species Senecio turczaninowii Maxim.
- Species Senecio turczaninowii Walp.
- Species Senecio turkestanicus C.Winkl. accepted as Ligularia songarica (Fisch.) Ling
- Species Senecio turneri Cheeseman accepted as Brachyglottis turneri (Cheeseman) C.J.Webb
- Species Senecio tussilaginea Kuntze
- Species Senecio tussilagineus (Burm.f.) Kuntze accepted as Farfugium japonicum (L.) Kitam.
- Species Senecio tussilaginis Less.
- Species Senecio tussilaginis (L'Hér.) Lindl. accepted as Pericallis tussilaginis (L'Hér.) D.Don
- Species Senecio tussilaginoides Walter
- Species Senecio tussilaginoides Sch.Bip.
- Species Senecio tussilaginoides Heynh.
- Species Senecio tweediei Hook. & Arn.
- Species Senecio tweedyi Rydb. accepted as Packera paupercula (Michx.) Á.Löve & D.Löve
- Species Senecio tylodis Muschl.
- Species Senecio tymphresteus Boiss. & Heldr.
- Species Senecio tyrolensis a.kern ex Kolb
- Species Senecio tysonii MacOwan
- Species Senecio ualtata Bertero ex Steud.
- Species Senecio ucranicus Hodálová accepted as Senecio hercynicus subsp. ucranicus (Hodálová) Greuter
- Species Senecio uhligii Muschl. accepted as Senecio meyeri-johannis Engl.
- Species Senecio uintahensis A.Nelson
- Species Senecio uintahensis (A.Nelson) Greenm. accepted as Packera multilobata (Torr. & A.Gray ex A.Gray) W.A.Weber & Á.Löve
- Species Senecio ukambensis O.Hoffm. accepted as Emilia ukambensis (O.Hoffm.) C.Jeffrey
- Species Senecio ukingensis O.Hoffm. accepted as Emilia ukingensis (O.Hoffm.) C.Jeffrey
- Species Senecio uliginosus DC.
- Species Senecio uliginosus Phil. accepted as Senecio zosterifolius Hook. & Arn.
- Species Senecio ullucosanus Hieron.
- Species Senecio ulopterus Thell.
- Species Senecio umbellatus L.
- Species Senecio umbraculifer S.Watson
- Species Senecio umbricola Cron & B.Nord.
- Species Senecio umbrosus Waldst. & Kit.
- Species Senecio umgeniensis Thell.
- Species Senecio uncinellus DC.
- Species Senecio unduavianus Cuatrec. accepted as Senecio multinervis Sch.Bip. ex Klatt
- Species Senecio undulatus Thunb.
- Species Senecio uniflorus Retz.
- Species Senecio uniflorus (All.) All. accepted as Jacobaea uniflora (All.) Veldkamp
- Species Senecio unionis Sch.Bip. ex A.Rich.
- Species Senecio uniserialis Sch.Bip.
- Species Senecio uralensis Gorodkov ex Krylov
- Species Senecio urbani Hieron.
- Species Senecio urbanii Hieron. accepted as Pentacalia urbanii (Hieron.) Cuatrec.
- Species Senecio urophyllus Conrath
- Species Senecio urubambense Cabrera accepted as Pentacalia urubambensis (Cabrera) Cuatrec.
- Species Senecio urubambensis Cabrera
- Species Senecio uruguayensis Cabrera accepted as Senecio leptolobus DC.
- Species Senecio urumovii Velen.
- Species Senecio urundensis S.Moore
- Species Senecio usambarensis Muschl. accepted as Mikaniopsis usambarensis (Muschl.) Milne-Redh.
- Species Senecio usgorensis Cuatrec.
- Species Senecio uspallatensis Hook. & Arn.
- Species Senecio uspantanensis (J.M.Coult.) Greenm.
- Species Senecio ussanguensis O.Hoffm. accepted as Lopholaena ussanguensis (O.Hoffm.) S.Moore
- Species Senecio ustulatus DC. accepted as Senecio littoreus var. littoreus Thunb.
- Species Senecio utahensis A.Nelson
- Species Senecio uvens Hiern accepted as Crassocephalum uvens (Hiern) S.Moore
- Species Senecio vaccarii Fiori
- Species Senecio vaccinioides (Kunth) Sch.Bip. ex Wedd. accepted as Pentacalia vaccinioides (Kunth) Cuatrec.
- Species Senecio vagans Wall.
- Species Senecio vagans Wall. ex DC. accepted as Synotis vagans (Wall. ex DC.) C.Jeffrey & Y.L.Chen
- Species Senecio vaginatus Hook. & Arn.
- Species Senecio vaginifolius Sch.Bip.
- Species Senecio vagus F.Muell.
- Species Senecio vaingaindrani Scott-Elliot
- Species Senecio vaingaindranii Scott-Elliot
- Species Senecio valderramae Phil. accepted as Senecio bracteolatus Hook. & Arn.
- Species Senecio valdivianus Phil. accepted as Senecio buglossus Phil.
- Species Senecio valeriana Oliv.
- Species Senecio valerianella Greene
- Species Senecio valerianifolius Gardner accepted as Erechtites valerianifolius (Link ex Wolf) Less. ex DC.
- Species Senecio valerianifolius Link ex Spreng. accepted as Erechtites valerianifolius (Link ex Wolf) Less. ex DC.
- Species Senecio valerianifolius Rchb. accepted as Erechtites valerianifolius (Link ex Wolf) Less. ex DC.
- Species Senecio valerianifolius Wolf accepted as Erechtites valerianifolius (Link ex Wolf) Less. ex DC.
- Species Senecio valerianifolius Desf. accepted as Erechtites valerianifolius (Link ex Wolf) Less. ex DC.
- Species Senecio vallecaucanus Cuatrec. accepted as Pentacalia vallecaucana (Cuatrec.) Cuatrec.
- Species Senecio vallestris DC. accepted as Senecio pentlandicus DC.
- Species Senecio valparadisiacus Colla accepted as Senecio glabratus Hook. & Arn.
- Species Senecio valparadisiensis J.Rémy
- Species Senecio vanillodorus Cabrera accepted as Dendrophorbium vanillodorum (Cabrera) H.Beltrán
- Species Senecio vaniotii H.Lév. accepted as Synotis vaniotii (H.Lév.) C.Jeffrey & Y.L.Chen
- Species Senecio vargasii Cabrera accepted as Dendrophorbium vargasii (Cabrera) H.Beltrán
- Species Senecio variabilis Sch.Bip.
- Species Senecio variabilis Phil.
- Species Senecio varicosus L.f.
- Species Senecio variegatus Sch.Bip.
- Species Senecio variifolius Rydb.
- Species Senecio variifolius DC. accepted as Senecio lyratus Forssk.
- Species Senecio variostipellatus De Wild. accepted as Gynura scandens O.Hoffm.
- Species Senecio varvarcensis Cabrera
- Species Senecio vaseyi Greenm. ex Piper accepted as Senecio integerrimus var. exaltatus (Nutt.) Cronquist
- Species Senecio vaseyi Greenm. accepted as Senecio integerrimus var. exaltatus (Nutt.) Cronquist
- Species Senecio vegetus (Wedd.) Cabrera
- Species Senecio veitchianus Hemsl. accepted as Ligularia veitchiana (Hemsl.) Greenm.
- Species Senecio velardei Cabrera
- Species Senecio velatus Greenm.
- Species Senecio velenovskyi Borbás accepted as Jacobaea erucifolia subsp. arenaria (Soó) B.Nord. & Greuter
- Species Senecio velleioides A.Cunn. ex DC.
- Species Senecio vellereus Franch. accepted as Ligularia vellerea (Franch.) Hand.-Mazz.
- Species Senecio velutinus H.Lév. & Vaniot accepted as Blumea lacera (Burm.f.) DC.
- Species Senecio venezuelae (V.M.Badillo) Cuatrec. accepted as Paragynoxys venezuelae (V.M.Badillo) Cuatrec.
- Species Senecio venezuelensis Sandwith accepted as Pentacalia venezuelensis (Sandwith) Cuatrec.
- Species Senecio venosus Harv.
- Species Senecio ventanensis Cabrera
- Species Senecio venturae T.M.Barkley
- Species Senecio venustus Ait.
- Species Senecio venustus Aiton accepted as Senecio grandiflorus P.J.Bergius
- Species Senecio verbascifolius Hombr. & Jacquinot ex Decne.
- Species Senecio verbascifolius Burm.
- Species Senecio verbascifolius Burm.f. accepted as Senecio smithii DC.
- Species Senecio verbenifolius Jacq. accepted as Senecio aegyptius L.
- Species Senecio verdooroiae R.A.Dyer accepted as Senecio lydenburgensis Hutch. & Burtt Davy
- Species Senecio veresczaginii Schischk. & Serg.
- Species Senecio vernalis Franch.
- Species Senecio vernalis Hoppe ex DC.
- Species Senecio vernalis Waldst. & Kit. accepted as Senecio leucanthemifolius subsp. vernalis (Waldst. & Kit.) Greuter
- Species Senecio vernicifolius Cuatrec. accepted as Pentacalia vernicifolia (Cuatrec.) Cuatrec.
- Species Senecio vernicosus Sch.Bip. ex Wedd. accepted as Pentacalia vernicosa (Sch.Bip. ex Wedd.) Cuatrec.
- Species Senecio vernicosus Baker accepted as Senecio neobakeri Humbert
- Species Senecio vernonioides Sch.Bip. accepted as Senecio erubescens var. erubescens Aiton
- Species Senecio vernonioides Sch.Bip. ex Baker accepted as Senecio lanifer Mart. ex C.Jeffrey
- Species Senecio vernus DC.
- Species Senecio vernus d'Urv.
- Species Senecio vernus Biv. accepted as Senecio leucanthemifolius Poir.
- Species Senecio verrucosus Sch.Bip. ex Wedd.
- Species Senecio verrucosus Panz.
- Species Senecio verrucosus Klatt
- Species Senecio verruculosus Kuntze accepted as Senecio miser Hook.f.
- Species Senecio versicolor Hiern accepted as Senecio polyodon var. polyodon DC.
- Species Senecio versteegii Mattf. accepted as Papuacalia versteegii (Mattf.) Veldkamp
- Species Senecio verticillatus Klatt
- Species Senecio verticillatus Klatt accepted as Pentacalia verticillata (Klatt) Cuatrec.
- Species Senecio veruicosus Sch.Bip.
- Species Senecio vervoorstii Cabrera
- Species Senecio vervoorstii C.Chr.
- Species Senecio vespertilio Franch. accepted as Parasenecio vespertilo (Franch.) Y.L.Chen
- Species Senecio vestitus (Thunb.) P.J.Bergius
- Species Senecio vestitus Sweet ex Steud.
- Species Senecio vicellipticus Cuatrec.
- Species Senecio vicinus S.Moore
- Species Senecio vidalii Phil. accepted as Senecio hakeifolius var. hakeifolius
- Species Senecio viejensis Greenm.
- Species Senecio viejoanus B.L.Turner
- Species Senecio villifer Franch. accepted as Sinosenecio villifer (Franch.) B.Nord.
- Species Senecio villiferus Franch.
- Species Senecio villifructus Hilliard
- Species Senecio villosus Kostel.
- Species Senecio viminalis Bremek.
- Species Senecio vimineus Harv. accepted as Senecio inaequidens DC.
- Species Senecio vimineus (auctt. non DC. & Harv.) DC. accepted as Senecio inaequidens DC.
- Species Senecio violaceus Wall.
- Species Senecio violifolius Cabrera
- Species Senecio viravira Hieron.
- Species Senecio vira-vira Hieron.
- Species Senecio virens Phil. accepted as Senecio acanthifolius Hombr. & Jacq.
- Species Senecio virgatus L.
- Species Senecio virgaurea Maxim. accepted as Ligularia virgaurea (Maxim.) Mattf. ex Rehder & Kobuski
- Species Senecio viridi-albus Cuatrec. accepted as Pentacalia viridialba (Cuatrec.) Cuatrec.
- Species Senecio viridiflavus Hand.-Mazz. accepted as Synotis erythropappa (Bureau & Franch.) C.Jeffrey & Y.L.Chen
- Species Senecio viridiflorus Hutch. accepted as Emilia marlothiana (O.Hoffm.) C.Jeffrey
- Species Senecio viridifluminis Cuatrec. accepted as Pseudogynoxys sodiroi (Hieron.) Cuatrec.
- Species Senecio viridilacus Cabrera
- Species Senecio viridis Phil.
- Species Senecio viridis Kirk accepted as Brachyglottis bidwillii var. viridis (Cheeseman) B.Nord.
- Species Senecio viridoalbus Cuatrec.
- Species Senecio viridulus Martrin-Donos
- Species Senecio viscidulus Compton
- Species Senecio viscidulus Scheele
- Species Senecio viscidus N.E.Br. accepted as Senecio subrubriflorus O.Hoffm.
- Species Senecio viscosissimus Colla
- Species Senecio viscosissimus Larrañaga
- Species Senecio viscosus L.
- Species Senecio viscosus Webb
- Species Senecio visianianus "papaf." ex Pacher & Jabornegg.
- Species Senecio visianianus Vis. accepted as Senecio thapsoides subsp. visianianus (Vis.) Vandas
- Species Senecio visianus Papaf. ex Vis.
- Species Senecio vitalba S.Moore accepted as Mikaniopsis vitalba (S.Moore) Milne-Redh.
- Species Senecio vitalis N.E.Br.
- Species Senecio vitellinoides Merxm.
- Species Senecio vitellinus Asch.
- Species Senecio vitifolius Weib.
- Species Senecio vittarifolius Bojer ex DC. accepted as Senecio emirnensis var. vittarifolius (Bojer ex DC.) Humbert
- Species Senecio vittatus Reiche accepted as Senecio ctenophyllus Phil.
- Species Senecio vogesiacus Gand.
- Species Senecio volcanicola C.Jeffrey
- Species Senecio volckameri Sch.Bip. accepted as Senecio arenarius Thunb.
- Species Senecio volckmannii Phil.
- Species Senecio volhynicus Gand.
- Species Senecio volkensii O.Hoffm. accepted as Senecio telekii (Schweinf.) O.Hoffm.
- Species Senecio volubilis Hook. accepted as Pseudogynoxys cordifolia (Cass.) Cabrera
- Species Senecio volutus (Baker) Humbert accepted as Senecio leucopappus var. volutus (Baker) Humbert
- Species Senecio vratislaviensis Gand.
- Species Senecio vukotinovici Schloss.
- Species Senecio vulcanicus Boiss.
- Species Senecio vulcanicus Sessé & Moc.
- Species Senecio vulcanicus Phil. accepted as Senecio chionophilus Phil.
- Species Senecio vulcanopichis Cuatrec.
- Species Senecio vulgari-humilis Batt. & Trab. accepted as Senecio vulgaris L.
- Species Senecio vulgaris L.
- Species Senecio vulneraria DC. accepted as Packera bellidifolia (Kunth) W.A.Weber & Á.Löve
- Species Senecio vulnerarius Sessé & Moc. accepted as Packera bellidifolia (Kunth) W.A.Weber & Á.Löve
- Species Senecio vulpinaris Cuatrec.
- Species Senecio wagneri Degen accepted as Tephroseris papposa subsp. wagneri (Degen) B.Nord.
- Species Senecio wairauensis Belcher
- Species Senecio walkeri Arn.
- Species Senecio walkeri Thwaites
- Species Senecio wallichii DC. accepted as Synotis wallichii (DC.) C.Jeffrey & Y.L.Chen
- Species Senecio walteri Sch.Bip. accepted as Arnoglossum ovatum (Walter) H.Rob.
- Species Senecio wardii Greene accepted as Packera streptanthifolia (Greene) W.A.Weber & Á.Löve
- Species Senecio warnockii Shinners
- Species Senecio warrenensis I.Thomps.
- Species Senecio warszewiczii A.Braun & Bouché
- Species Senecio warszewiczii R.Br. & Bouché
- Species Senecio warszewiczii A.Braun & C.D.Bouché
- Species Senecio wartmannii Brügger
- Species Senecio waterbergensis S.Moore
- Species Senecio watsonii Greenm.
- Species Senecio webbii Christ.
- Species Senecio webbii (Sch.Bip.) Christ accepted as Pericallis webbii (Sch.Bip.) Bolle
- Species Senecio weberbaueri Cuatrec.
- Species Senecio websteri Hook.f.
- Species Senecio websteri Greenm. accepted as Senecio neowebsteri S.F.Blake
- Species Senecio weddellianus Hieron.
- Species Senecio weddellii Cabrera accepted as Senecio rhizomatus Rusby
- Species Senecio wedglacialis Cuatrec.
- Species Senecio weinmannifolius Cuatrec. accepted as Pentacalia weinmannifolia (Cuatrec.) Cuatrec.
- Species Senecio welwitschii O.Hoffm. accepted as Kleinia fulgens Hook.f.
- Species Senecio werdermannii Greenm.
- Species Senecio werneriifolius (A.Gray) A.Gray accepted as Packera werneriifolia (A.Gray) W.A.Weber & Á.Löve
- Species Senecio wernerioides Wedd. accepted as Senecio breviscapus DC.
- Species Senecio westermanii Dusén
- Species Senecio weylii Vatke
- Species Senecio whippleanus A.Gray accepted as Senecio integerrimus var. major (A.Gray) Cronquist
- Species Senecio whitwellianus F.Lees
- Species Senecio whyteanus Britten
- Species Senecio wightianus DC. ex Wight
- Species Senecio wightianus DC.
- Species Senecio wightii (DC. ex Wight) Benth. ex C.B.Clarke
- Species Senecio willdenowii Sch.Bip.
- Species Senecio willdenowii Peruzzi & N.G.Passal. accepted as Jacobaea maritima subsp. bicolor (Willd.) B.Nord. & Greuter
- Species Senecio williamsii Phil.
- Species Senecio williamsii Rusby accepted as Dendrophorbium cabrerianum (Greenm. & Cuatrec.) C.Jeffrey
- Species Senecio willingii Greenm.
- Species Senecio willowensis Greenm.
- Species Senecio wilsonianus Hemsl. accepted as Ligularia wilsoniana (Hemsl.) Greenm.
- Species Senecio windhoekensis Merxm.
- Species Senecio winklerianus Hand.-Mazz. accepted as Sinosenecio euosmus (Hand.-Mazz.) B.Nord.
- Species Senecio wittebergensis Compton
- Species Senecio wolffii Simonk.
- Species Senecio wolfii Greenm.
- Species Senecio wollastonii S.Moore accepted as Senecio subsessilis Oliv. & Hiern
- Species Senecio woodii J.Calvo
- Species Senecio woodsonianus Cuatrec.
- Species Senecio wootonii Greene
- Species Senecio woytkowskii Cuatrec. accepted as Nordenstamia woytkowskii (Cuatrec.) B.Nord.
- Species Senecio wrightii Greenm. accepted as Packera cynthioides (Greene) W.A.Weber & Á.Löve
- Species Senecio wurdackii Cuatrec. accepted as Pentacalia wurdackii (Cuatrec.) Cuatrec.
- Species Senecio xanthocephalus Dusén accepted as Senecio fistulosus Poepp. ex Less.
- Species Senecio xantholeucus Hand.-Mazz. accepted as Synotis xantholeuca (Hand.-Mazz.) C.Jeffrey & Y.L.Chen
- Species Senecio xanthopappus Klatt accepted as Pentacalia americana (L.f.) Cuatrec.
- Species Senecio xanthoxylon Phil. accepted as Senecio patagonicus Hook. & Arn.
- Species Senecio xarilla Sessé & Moc.
- Species Senecio xenostylus O.Hoffm.
- Species Senecio xerophilus Phil.
- Species Senecio yacuanquensis Cuatrec.
- Species Senecio yakla C.B.Clarke accepted as Ligularia amplexicaulis DC.
- Species Senecio yakoensis Jeffrey accepted as Synotis yakoensis C.Jeffrey & Y.L.Chen
- Species Senecio yalae Cabrera
- Species Senecio yalungenensis Hand.-Mazz.
- Species Senecio yalungensis Hand.-Mazz. accepted as Cissampelopsis spelaeicola C.Jeffrey & Y.L.Chen
- Species Senecio yalusay Cabrera
- Species Senecio yapacanus Aristeg. accepted as Pentacalia yapacana (Aristeg.) Cuatrec.
- Species Senecio yauyensis Cabrera
- Species Senecio yegua (Colla) Cabrera
- Species Senecio yesoensis Franch. accepted as Ligularia hodgsonii Hook.
- Species Senecio yukonensis A.E.Porsild accepted as Tephroseris yukonensis (A.E.Porsild) Holub
- Species Senecio yungasensis Britton accepted as Pentacalia yungasensis (Britton) Cuatrec.
- Species Senecio yungningensis Hand.-Mazz.
- Species Senecio yunguyensis Cuatrec.
- Species Senecio yunnanensis Franch. accepted as Senecio nudicaulis Buch.-Ham. ex D.Don
- Species Senecio yurensis Rusby
- Species Senecio zahlbruckneri Brügger
- Species Senecio zapahuirensis Martic. & Quezada
- Species Senecio zapalae Cabrera
- Species Senecio zeyheri Turcz. accepted as Senecio oxyodontus DC.
- Species Senecio zeylanicus DC.
- Species Senecio zimapanicus Hemsl.
- Species Senecio zoellneri Martic. & Quezada
- Species Senecio zoellneri Marticorena & Quezada accepted as Culcitium albifolium Zoellner
- Species Senecio zollingerianus Sch.Bip. accepted as Gynura aurantiaca var. aurantiaca
- Species Senecio zongoensis Cabrera accepted as Dendrophorbium zongoense (Cabrera) D.J.N.Hind
- Species Senecio zosterifolius Hook. & Arn.
- Species Senecio zuccarinii Maxim.
- Genus Senecio pre Herbarium Practice & Following Welman.
- Genus Senecurio Gideon F.Sm. & Figueiredo (1)
- Genus Shafera Greenm. (1)
- Genus Sinacalia H.Rob. & Brettell (4)
- Genus Sinosenecio B.Nord. (36)
- Genus Solanecio (Sch.Bip.) Sch.Bip. ex Walp. (16)
- Genus Steirodiscus Less. (6)
- Genus Stenops B.Nord. (2)
- Genus Stilpnogyne DC. (1)
- Genus Symphyochaeta (DC.) Skottsb. accepted as Robinsonia DC.
- Genus Syneilesis Maxim. (6)
- Genus Synosma Raf. ex Britton & A.Br. accepted as Hasteola Raf. (1)
- Genus Synotis (C.B.Clarke) C.Jeffrey & Y.L.Chen (51)
- Genus Talamancalia H.Rob. & Cuatrec. (4)
- Genus Telanthophora H.Rob. & Brettell (5)
- Genus Tephroseris (Rchb.) Rchb. (40)
- Genus Tetradymia DC. (7)
- Genus Thodaya Compton accepted as Euryops (Cass.) Cass.
- Genus Traversia Hook.f. (1)
- Genus Trineuron Hook.f.
- Genus Tussilago L. (1)
- Genus Urostemon B.Nord.
- Genus Villasenoria B.L.Clark (1)
- Genus Werneria Kunth accepted as Senecioneae Cass. (17)
- Genus Xenocarpus Cass. accepted as Cineraria L.
- Genus Xenophyllum V.A.Funk (21)
- Genus Xyridopsis Welw. ex B.Nord. accepted as Emilia Cass.
- Genus Yermo R.D. Dorn (1)
- Genus Zemisia B.Nord.
- Tribe Tageteae Cass. (267)
- Tribe Ursinieae H.Rob. & Brettell accepted as Anthemideae Cass.
- Subtribe Nannoglottidinae Y.R.Ling accepted as Nannoglottidinae G.L. Nesom
- Genus Callilepis DC. (5)
- Genus Zoutpansbergia Hutch. accepted as Callilepis DC.
- Subfamily Baccharidoideae Burmeist. accepted as Asteroideae (Cass.) Lindl.
- Subfamily Barnadesioideae (Benth. & Hook.) K.Bremer & R.K.Jansen accepted as Barnadesioideae (D.Don) Bremer & Jansen
- Subfamily Barnadesioideae (D.Don) Bremer & Jansen (88)
- Subfamily Carduoideae Cass. ex Sweet (3 634)
- Subfamily Cichorioideae Chevall. (6 817)
- Subfamily Corymbioideae Panero & V.A.Funk (10)
- Subfamily Dicomoideae S. Ortiz (113)
- Subfamily Famatinanthoideae S.E.Freire, Ariza & Panero (1)
- Subfamily Gochnatioideae (Benth. & Hook.f.) Panero & V.A.Funk (103)
- Subfamily Gymnarrhenoideae Panero & V.A.Funk (2)
- Subfamily Hecastocleidoideae Panero & V.A.Funk (1)
- Subfamily Lactucoideae (Cass.) Lindl. accepted as Cichorioideae Chevall.
- Subfamily Lactucoideae Solbrig accepted as Cichorioideae Chevall.
- Subfamily Mutisioideae (Cass.) Lindl. (632)
- Subfamily Pertyoideae Panero & V.A.Funk (99)
- Subfamily Stifftioideae (D.Don) Panero (45)
- Subfamily Vernonioideae B.L.Turner ex R.K.Jansen & Stuessy accepted as Vernonioideae Lindl.
- Subfamily Vernonioideae Lindl. (2 357)
- Subfamily Wunderlichioideae Panero & V.A.Funk (42)
- Genus ×Anthisma
- Genus ×Anthocephalum
- Genus ×Chrysaboltonia
- Genus Absynthium G.Gaertn., B.Mey. & Scherb.
- Genus Acanthosonchus Don ex Hoffm.
- Genus Acarphaea Harv., Gray & ex.A.Gray
- Genus Achyrobaccharis Sch.Bip. ex Walp.
- Genus Achyrocoma Post & Kuntze
- Genus Achyrophorus Vaill. accepted as Hypochaeris L. (4)
- Genus Achyrostephus Kunze ex Rchb.
- Genus Acrolinium Engl.
- Genus Actispermum Raf.
- Genus Adenochaena Steud.
- Genus Adenochaena DC.
- Genus Adenoselen Spach
- Genus Aetheorrhiza Rchb.
- Genus Agalma Steud.
- Genus Aganippea Moc. ex Sessé ex DC. accepted as Jaegeria Kunth
- Genus Agathea Endl.
- Genus Agathomeris Laun.
- Genus Ageratiopsis Sch.Bip. ex Benth. accepted as Ageratina Spach
- Genus Aglaodendron J.Rémy
- Genus Agnesia Zuloaga & Judz.
- Genus Ailotheca Hemsl.
- Genus Aimorra Raf.
- Genus Ainsliea Kuntze
- Genus Alcinia Kunth
- Genus Aliconia Herrera
- Genus Allendea La Llave & Lex. accepted as Liabum Adans.
- Genus Alloeospermum Spreng.
- Genus Alloizonium Walp.
- Genus Aloiozonium Lindl.
- Genus Alymnia Neck. ex Spach
- Genus Amblycarpum Lem.
- Genus Amblyopelis Steud.
- Genus Ambraria Cruse
- Genus Ammanthus Boiss. & Heldr.
- Genus Amoleiachyris Sch.Bip.
- Genus Amphipappus Torr. & A.Gray
- Genus Anactis (Cass. ex DC.) Spach
- Genus Andriala Decne.
- Genus Andromachia Humb.
- Genus Anemonospermos Möhring
- Genus Anemonospermum Comm. ex Steud.
- Genus Anisorhamphus Endl.
- Genus Anisorrhamphus Rchb.
- Genus Anonymos Walter
- Genus Anthe-matricaria Geisenh. ex Domin
- Genus Anthemi-matricaria P.Fourn.
- Genus Anthochytrum Rchb. accepted as Crepis L.
- Genus Anticona E.Linares, J.Campos & A.Galán
- Genus Antitrixia Decaisne
- Genus Aplochlamis Steud.
- Genus Aptilon Raf.
- Genus Aquilula G.L.Nesom
- Genus Arachnopogon Berg ex Haberl
- Genus Archaetogeron Greenm.
- Genus Archanthemis Lo Presti & Oberpr.
- Genus Arctotheca Wendl.
- Genus Argyranthus Neck.
- Genus Argyrocome Breyne
- Genus Arnicula Kuntze
- Genus Arraschkoolia Sch.Bip. ex Hochst.
- Genus Arthemisia Neck.
- Genus Artimisia Roxb.
- Genus Asaemia Harv. ex Benth.
- Genus Ascaridia Rchb.
- Genus Aschenbornia Schauer accepted as Calea L.
- Genus Asiris Anonymous
- Genus Astartoseris N.Kilian, Hand, Hadjik., Christodoulou & Bou Dagh.-Kharr.
- Genus Asterago Everett
- Genus Asteridia N.T.Burb.
- Genus Asterigeron Tzvelev
- Genus Asteriscus Siegesb.
- Genus Asteromaea DC.
- Genus Athalmus Neck.
- Genus Atheolaena Rchb.
- Genus Atractylia Rchb.
- Genus Attractilis Hall. ex Scop.
- Genus Aucheria Steud.
- Genus Autunesia O.Hoffm.
- Genus Balladonia P.S.Short (1)
- Genus Barattia A.Gray & Engelm.
- Genus Barbeya Albov
- Genus Barckhausenia Menke
- Genus Barkhusenia Hoppe
- Genus Barrattia A.Gray & Engelm. ex A.Gray accepted as Simsia Pers.
- Genus Barroetia Post & Kuntze
- Genus Bartolia Adans. accepted as Tridax L.
- Genus Bastera J.F.Gmel.
- Genus Bastia Steud.
- Genus Behrinia Sieber ex Steud.
- Genus Bellidiastrum Vaill.
- Genus Bellidistrum Rchb.
- Genus Bembecodium Lindl.
- Genus Bennetia DC.
- Genus Berarda "Vill."St-Lager
- Genus Berckheya Pers.
- Genus Berinia Brignol.
- Genus Bernardia Endl.
- Genus Bertholetia Rchb.
- Genus Bertilia Cron
- Genus Bethencourtia Choisy
- Genus Binectaria Forssk.
- Genus Bizanilla J.Rémy
- Genus Blanchea Boiss.
- Genus Bojera Steud.
- Genus Bowmannia Gardner accepted as Trixis P.Browne
- Genus Brachioglottis Desportes
- Genus Brachyachaenium Baker accepted as Dicoma Cass.
- Genus Brachycladus Wittstein
- Genus Brachyglottis Forst.
- Genus Brachyoglotis Lam.
- Genus Brachyoglottis Scop.
- Genus Brachyrrhamphus Wittstein
- Genus Bracteantha Anderb.
- Genus Breteuillia Buc'hoz
- Genus Breteuillia Buc'hoz ex DC.
- Genus Buphthalmum Mill.
- Genus Cabralia F. von Paula von Schrank
- Genus Cacalia Burm.
- Genus Calendella Kuntze
- Genus Calimeris Nees
- Genus Callias Cass.
- Genus Calophthalmum Rchb.
- Genus Caltha Tourn. ex Adans.
- Genus Calycosorus Endl.
- Genus Calymnandra Lindl.
- Genus Campylochinium Endl.
- Genus Caputia B.Nord. & Pelser
- Genus Carelia Fabr. accepted as Ageratum L.
- Genus Carelia Möhring
- Genus Carelia Cav.
- Genus Carnutia Baker accepted as Melampodium L.
- Genus Carpezium Gouan
- Genus Catanance St.-Lag.
- Genus Catyona Lindl.
- Genus Centroclinion Orb.
- Genus Cephalopterum T.Post & Kuntze
- Genus Ceratogyna T.Post & Kuntze
- Genus Cereopsis Blanco
- Genus Cervana Endl.
- Genus Chaenolobus Small
- Genus Chaetantera Less.
- Genus Chaethymenia Endl.
- Genus Chaetophora Nutt. ex DC.
- Genus Chaetophora Schrank
- Genus Chakiatella DC.
- Genus Chalarium Poit. ex DC.
- Genus Chamaemelum Adans.
- Genus Chamissomenia Kuntze accepted as Schlechtendalia Less.
- Genus Chaptalia Royle
- Genus Chareis N.T.Burb.
- Genus Chersodoma Phil. & Cabrera
- Genus Chicorium Dumort.
- Genus Childsia Childs
- Genus Chilodia R.Br. accepted as Wulffia Neck.
- Genus Chiroloma T.Post & Kuntze
- Genus Chlaotrachelus Hook.f.
- Genus Chone Dulac
- Genus Chrisanthemum Neck. accepted as Chrysanthemum L.
- Genus Chrysaboltonia Arends
- Genus Chrysanthemoides Tourn. ex Medik.
- Genus Chrysocome St.-Lag.
- Genus Chrysogonum L. & F.Br.
- Genus Chrysopelta Tausch
- Genus Claotrachelus Zoll. & Moritz ex Zoll. accepted as Vernonia Schreb.
- Genus Clariona Spreng.
- Genus Clarionea Cass. accepted as Perezia Lag.
- Genus Clarionia D.Don accepted as Perezia Lag.
- Genus Cleistanthium Kunze
- Genus Cleithria Steud.
- Genus Clomenolepis Cass.
- Genus Cnenamum Tausch
- Genus Coelestina Hill
- Genus Coelestinia Endl.
- Genus Coenotus Benth. & Hook.f.
- Genus Colonnea Endl.
- Genus Colycea Fern.Casas & Susanna accepted as Centaurea L.
- Genus Conisa Desf. ex Steud.
- Genus Coniza Neck.
- Genus Conopsis Nutt. ex Less. accepted as Coreopsis L.
- Genus Conysa Adans.
- Genus Conysa Burm.f.
- Genus Conyza Hill
- Genus Conyzella Fabric. accepted as Conyza Less.
- Genus Conyzoides Tourn. ex DC.
- Genus Coriopsis Post & Kuntze
- Genus Coronocarpus Schumach.
- Genus Cosmus Pers. accepted as Cosmos Cav. (1)
- Genus Cotyla Kuntze & Post accepted as Cotula Tourn. ex L.
- Genus Covola Neck. ex Raf.
- Genus Cremocephalium Miq.
- Genus Crepidospermum Benth. & Hook.f.
- Genus Criscianthus Grossi & J.N.Nakaj.
- Genus Crossocephalum Britten
- Genus Crossolepsis N.T.Burb.
- Genus Cryptodia Sch.Bip.
- Genus Cryptopetalum Cass. accepted as Pectis L.
- Genus Cryptopetalum DC.
- Genus Ctenosperma F.Muell. ex Pfeiff.
- Genus Culcitum N.T.Burb.
- Genus Cupidone Lemaire
- Genus Cyclolepsis Endl.
- Genus Cyclopis Guill.
- Genus Cylindrachne Rchb.
- Genus Cyrethrum Boiss.
- Genus Dalea P.Browne accepted as Critonia P.Browne
- Genus Damatras Rchb.
- Genus Damatrias Rchb.
- Genus Delilea Kuntze
- Genus Delwiensia W.A.Weber & R.C.Wittmann
- Genus Dendrocacalia (Nakai) Nakai
- Genus Dendroviguiera E.E.Schill. & Panero
- Genus Deneckia Sch.Bip.
- Genus Denekea Dinter
- Genus Denneckia Steud.
- Genus Desmocephalus Benth. & Hook.f.
- Genus Dewildemania O.Hoffm. ex De Wild.
- Genus Diaspanthus Kitam.
- Genus Diatonta Walp. accepted as Bidens L.
- Genus Diatosperma Mueller Hal.
- Genus Diatosperma Müll.Berol.
- Genus Dichaeta Sch.Bip. accepted as Macvaughiella R.M.King & H.Rob.
- Genus Dicrocephala Royle
- Genus Diospermum Hook.f.
- Genus Diotis Schreb.
- Genus Diplopapus Raf.
- Genus Diplostylis Sond.
- Genus Diplothria Walp.
- Genus Disynanthes Rchb.
- Genus Disynapheia Steud.
- Genus Dithrichum DC.
- Genus Dolicholasium Spreng.
- Genus Dolicotheca Benth. & Hook.f.
- Genus Doria Adans.
- Genus Doroboea DC.
- Genus Dracopsis Cass. accepted as Rudbeckia L.
- Genus Duguldea Meisn.
- Genus Duhaldia Sch.Bip.
- Genus Dysinanthus Raf. ex DC.
- Genus Dysodea Borkh. accepted as Crepis L.
- Genus Dysodia DC.
- Genus Dysodia Spreng.
- Genus Ecliptica Rumph.
- Genus Edwardsia Endl.
- Genus Eizaguirrea J.Rémy
- Genus Electranthera Mesfin, D.J.Crawford & Pruski
- Genus Eleutheranthera Poit. ex Bosc
- Genus Elvina Steud.
- Genus Emelia Wight
- Genus Enchelya Lem.
- Genus Enchydra F.Muell.
- Genus Engelmannia Torr. & A.Gray
- Genus Englemannia A.Gray & ex.Nutt.
- Genus Enula Neck.
- Genus Epalthes Walp.
- Genus Epilasia Benth. & Hook.f.
- Genus Epilatoria Comm. ex Steud.
- Genus Epilepsis Lindl.
- Genus Erechthites Less.
- Genus Ericentrodea Blake, Sherff & Sherff
- Genus Eriocarpha Cass. accepted as Montanoa Cerv.
- Genus Erioclepis Fourr.
- Genus Eriocoryna Steud.
- Genus Erytheremia Endl.
- Genus Espletia Steud.
- Genus Eualcida Hemsl.
- Genus Eucalia Raeusch.
- Genus Eupatoriophalacron Adans.
- Genus Euphrosine Endl.
- Genus Euphrosinia Rchb.
- Genus Eurybia (Cass.) Cass. (1)
- Genus Euthamia Elliott
- Genus Eyselia Reichb. accepted as Egletes Cass.
- Genus Faberia Hemsl. ex Forb. & Hemsl.
- Genus Feea Kuntze
- Genus Filfia Holub
- Genus Fivaldia Walp.
- Genus Fleurotia Rchb.
- Genus Fornea Steud.
- Genus Frageria Delile ex Steud.
- Genus Frankia Steud. ex Steud.
- Genus Frankoeria Steud.
- Genus Freemannia Steud.
- Genus Frivaldzkia Rchb.
- Genus Gaillarda St.-Lag.
- Genus Gaillardia Fouger.: Biddulph
- Genus Galactella Raf.
- Genus Galardia Lam.
- Genus Galasia W.D.J.Koch
- Genus Galinsogaea Himpel accepted as Galinsoga Ruiz & Pav.
- Genus Galinsogaea Zucc.
- Genus Galinsogea Willd. accepted as Galinsoga Ruiz & Pav.
- Genus Galinsoja Roth accepted as Galinsoga Ruiz & Pav.
- Genus Galinzoga Dumort.
- Genus Galisongea Willd.
- Genus Gallinsoga St.Hil. accepted as Galinsoga Ruiz & Pav.
- Genus Gallinsoga J.St.-Hil.
- Genus Gamazygis Pritz.
- Genus Garaleum Sch.Bip.
- Genus Garcillasoa Post & Kuntze
- Genus Gareilassa Walp.
- Genus Garulium Bartl.
- Genus Gazaniopsis C.Huber
- Genus Gazzania
- Genus Geblera Kitag. accepted as Crepidifolium Sennikov
- Genus Geigera Less.
- Genus Gemmaria Noronha
- Genus Geracium Mössler accepted as Crepis L.
- Genus Gerbera Gronov.
- Genus Gerbera Cass.
- Genus Gerberia Cass.
- Genus Ginura Vidal y Soler
- Genus Ginura S.Vidal
- Genus Gnaphalium Adans.
- Genus Gnaphalodes Tourn. ex Adans.
- Genus Golionema "S.Wats." ex O.Hoffm.
- Genus Gomesia La Llave
- Genus Gomezia Benth. & Hook.f.
- Genus Gonzalezia E.E.Schill. & Panero
- Genus Gortera Hill
- Genus Grammartheon Rchb.
- Genus Grantia Griff.
- Genus Greenmaniella Sharp
- Genus Guandiola Steud.
- Genus Guardiola Cerv. ex Bonpl.
- Genus Guntheria Benth. & Hook.f.
- Genus Guzmannia F.Phil.
- Genus Gymnarrhea Steud.
- Genus Gymnema Endl.
- Genus Gymnoloma Ker Gawl.
- Genus Gymnostyles Raf.
- Genus Gymnoxis Steud.
- Genus Gymostyles Willd.
- Genus Gyneteria Spreng.
- Genus Gynoxis Rchb.
- Genus Haberlea Pohl ex Baker
- Genus Hacub Boehm.
- Genus Haegiela P.S.Short
- Genus Haenslera Steud.
- Genus Hainanecio Y.Liu & Q.E.Yang
- Genus Halea L. accepted as Eupatorium Tourn. ex L.
- Genus Hamalium Hemsl.
- Genus Hapalochlamys Kuntze
- Genus Hapalochlamys Rchb.
- Genus Hapalostephium D.Don accepted as Crepis L.
- Genus Hapalostephium D.Don ex Sweet
- Genus Hapalus Endl.
- Genus Haplopappus Endl.
- Genus Haradjania Rech.f.
- Genus Harpachaena Bunge accepted as Acanthocephalus Kar. & Kir.
- Genus Harpalyce D.Don
- Genus Harpocarpus Endl. accepted as Acanthocephalus Kar. & Kir.
- Genus Harrisonia Neck.
- Genus Hartwrightia A.Gray
- Genus Havanella Kuntze
- Genus Haxtonia Caley ex G.Don
- Genus Hecatactis F.Muell.
- Genus Hectorea DC.
- Genus Hedraiophyllum Less. ex Steud.
- Genus Hedypnois Schreb.
- Genus Heiseria E.E.Schill. & Panero
- Genus Helemonium Steud.
- Genus Heleneum Buckley
- Genus Helenia Mill.
- Genus Helenia Zinn
- Genus Heleniastrum Mill.
- Genus Heleniastrum Kuntze
- Genus Helenomoium Willd. ex DC. accepted as Heliopsis Pers.
- Genus Helianthemum Gray
- Genus Helichryson
- Genus Helicta Less.
- Genus Heliochroa A.Gray
- Genus Helipteron St.-Lag.
- Genus Helmentia J.St.-Hil.
- Genus Helminta Willd.
- Genus Helminthia DC.
- Genus Helminthion St.-Lag.
- Genus Helminthoteca Vaill. ex Juss.
- Genus Helminthotheca Vaill. ex Boehm.
- Genus Heloseris Rchb. ex Steud.
- Genus Hemilepis Schltdl. accepted as Leontodon L.
- Genus Hemilepis Kunze
- Genus Hemiptilium A.Gray accepted as Stephanomeria Nutt.
- Genus Hemolepis Hort. ex E.Vilm.
- Genus Henanthus Less
- Genus Henslera Rchb.
- Genus Heocarphus Phil.
- Genus Heraclea Hill
- Genus Herbichia Zaw.
- Genus Herbichia Zaw. ex Guill.
- Genus Herotium Steud.
- Genus Hersilea Klotzsch
- Genus Hertia Neck.
- Genus Hesperoseris Skottsb. accepted as Dendroseris D.Don
- Genus Heteracantha Link ex Steud.
- Genus Heteracea Steud.
- Genus Heteranthus Bonpl. ex Cass. accepted as Perezia Lag.
- Genus Heterodonta Nutt. ex Benth. & Hook.f.
- Genus Heterolaena Sch.Bip. ex Benth. & Hook.f. accepted as Chromolaena DC.
- Genus Heteromorpha Viv. ex Coss.
- Genus Heteropleura Sch.Bip. accepted as Hieracium Tourn. ex L.
- Genus Heterorachis Sch.Bip.
- Genus Heterospermum Willd. accepted as Heterosperma Cav.
- Genus Hieraceum Hoppe
- Genus Hierachium Hill
- Genus Hieraciastrum Heist. ex Fabr.
- Genus Hieracioides Fabr.
- Genus Hieracion St.-Lag.
- Genus Hieracum
- Genus Hierapicra Kuntze
- Genus Hingcha Roxb.
- Genus Hinghstonia Steud.
- Genus Hinterhubera Sch.Bip. accepted as Chrysanthellum Rich.
- Genus Hinterhubera Sch.Bip. ex Hochst. accepted as Chrysanthellum Rich.
- Genus Hinterhubera Sch.Bip.
- Genus Hiorthia Neck.
- Genus Hiortia Juss.
- Genus Hipochaeris Nocca
- Genus Hipochoeris Neck.
- Genus Hippia L.f. accepted as Cotula Tourn. ex L.
- Genus Hippophaestum Gray
- Genus Hisutua
- Genus Hochstettera Spach
- Genus Hohenwartha Vest
- Genus Homalanthus Wittst.
- Genus Homalotes Endl.
- Genus Homalotheca Rchb.
- Genus Homostylium Nees
- Genus Hookia Neck.
- Genus Hoorebeckia Steud.
- Genus Hoorebekia Corneliss.
- Genus Hopkirkia Spreng. accepted as Salmea DC.
- Genus Hopkirkia DC. accepted as Schkuhria Roth.
- Genus Huenefeldia Walp.
- Genus Hunefeldia Lindl.
- Genus Hunteria ex DC.
- Genus Hyalospermum Benth. & Hook.f.
- Genus Hylethale Link
- Genus Hymenomena Less.
- Genus Hymenostephium Benth. & Hook.f.
- Genus Hypochoeris L.
- Genus Hyppochaeris Biv.
- Genus Hysteronica Endl.
- Genus Hysterophorus Adans.
- Genus Ichthyothera [Klotzsch & ex]
- Genus Ichtyothere DC.
- Genus Icthyothere Baker
- Genus Ictinus Cass. accepted as Gorteria L.
- Genus Idianthes Desv. accepted as Crepis L.
- Genus Idicium Neck.
- Genus Indoixeris Kitam.
- Genus Infantea Remy accepted as Amblyopappus Hook. & Arn.
- Genus Ingenhousia Kuntze
- Genus Ingenhousia Steud.
- Genus Ingenhouzia Bertero ex DC.
- Genus Inthybus Herder
- Genus Intybellia Monn.
- Genus Intybus Fr. accepted as Crepis L.
- Genus Intybus Zinn
- Genus Inyonia M.E.Jones
- Genus Iocaste E.Mey. ex DC.
- Genus Iodocephalopsis S. Bunwong & H.Rob. (1)
- Genus Iodocephalopsis Bunwong & H.Rob.
- Genus Iranoaster Kaz.Osaloo, Farhani & Mozaff. (1)
- Genus Isanthus DC. accepted as Perezia Lag.
- Genus Ischnaea
- Genus Ismaria Raf. accepted as Brickellia Elliott
- Genus Isocarpha Less. accepted as Ageratum L.
- Genus Isomeria D.Don ex DC.
- Genus Iteria Hort.
- Genus Ixauchenus Cass. accepted as Lagenophora Cass.
- Genus Ixiauchenus Less.
- Genus Ixine Hill
- Genus Ixiochlamys F.Muell. ex Sond.
- Genus Jacobaea Burm.
- Genus Jacobaea Burm. ex Kuntze
- Genus Jacobea Thunb.
- Genus Jacosta DC.
- Genus Jacquemontia Bél.
- Genus Jalambica Raf.
- Genus Jamesia Nees
- Genus Japonicalia C.Ren & Q.E.Yang
- Genus Jardinia Sch.Bip.
- Genus Jeffreya Cabrera
- Genus Jeffreyzia
- Genus Jessenia F.Muell. ex Sond.
- Genus Jobaphes Phil. accepted as Aphyllocladus Wedd. (1)
- Genus Jocaste Meisn.
- Genus junceum (Poljakov) Filatova
- Genus Kahiria Forssk.
- Genus Kalimares Raf.
- Genus Kallophyllon Pohl ex Baker
- Genus Karthemia Sch.Bip.
- Genus Keerlia A.Gray & Engelm.
- Genus Kegelia Sch.Bip. accepted as Eleutheranthera Poit.
- Genus Keringa Raf.
- Genus Kiliana Sch.Bip. ex Hochst.
- Genus Kiliania Sch.Bip. ex Benth. & Hook.f.
- Genus Kitamuraea Rauschert accepted as Miyamayomena Kitam.
- Genus Kitamuraster Soják accepted as Miyamayomena Kitam.
- Genus Kleina Cothen.
- Genus Klenzea Sch.Bip. ex Steud.
- Genus Klenzea Sch.Bip. ex Hochst.
- Genus Koanophyllon Arruda ex H.Kost.
- Genus Koanophyllum Arruda ex H.Kost.
- Genus Koechlea Endl.
- Genus Kralikia Sch.Bip.
- Genus Kraussia Sch.Bip.
- Genus Krenamon Adans.
- Genus Kuhniodes Post & Kuntze
- Genus Kyberia Neck.
- Genus Kymapleura (Nutt.) Nutt. accepted as Agoseris Raf.
- Genus Kyrstenia Neck. ex Greene accepted as Ageratina Spach
- Genus Kyrstenia Neck. accepted as Ageratina Spach
- Genus Lachanostachys Endl.
- Genus Lachnothalamus F.Muell.
- Genus Laciala Kuntze
- Genus Laciniaria Kuntze
- Genus Laciniaria Hill
- Genus Lactucopsis Sch.Bip. ex Vis.
- Genus Laenecia Sch.Bip. ex Walp.
- Genus Laenecia Sch.Bip.
- Genus Lagaseris
- Genus Lagenifera Cass.
- Genus Lagerophora Domin
- Genus Laggera Sch.Bip. ex Walp. accepted as Cotula Tourn. ex L.
- Genus Laggera Sch.Bip. ex Benth.
- Genus Lagoseris Hoffmanns. ex Hoffmanns. & Link
- Genus Lagothamnus Nutt.
- Genus Lalda Bubani
- Genus Lamprochlaena F.Muell.
- Genus Lampsana Mill.
- Genus Lampsana Rupp.
- Genus Lancisia Ponted. ex Adans.
- Genus Langsdorffia Willd. ex Steud.
- Genus Lapeirousia Thunb.
- Genus Lapeyrousia Thunb.
- Genus Lapeyrousia Spreng.
- Genus Lapsyoungia Hiyama
- Genus Lasallea Greene accepted as Aster L.
- Genus Lasianthea Endl.
- Genus Lasiocarphus Pohl ex Baker
- Genus Lasiophyton Hook. & Arn.
- Genus Lasiopus D.Don
- Genus Lasiorhiza Kuntze
- Genus Lasiospermum Fisch.
- Genus Launaea Auct. accepted as Launaea Cass.
- Genus Launaya Kuntze
- Genus Launaya Rchb.
- Genus Launea Endl.
- Genus Laurencellia Neumann
- Genus Laurentia Steud. accepted as Sanvitalia Lam.
- Genus Lavidia Phil.
- Genus Laxanon Raf.
- Genus Laxmannia J.R.Forst. & G.Forst. accepted as Petrobium R.Br.
- Genus Laxmannia Forst.
- Genus Laxopetalum Pohl ex Baker
- Genus Laya Endl.
- Genus Lebianthus K.Schum.
- Genus Leeria Steud.
- Genus Leiodon Shuttlew. ex Sherff
- Genus Lejica Hill ex DC. accepted as Zinnia L.
- Genus Leo Phil. accepted as Helogyne Nutt.
- Genus Leontodon Adans.
- Genus Leontondon Robin
- Genus Leontonix Heynh.
- Genus Leontopodion St.-Lag.
- Genus Lepicline Less.
- Genus Lepidonema Fisch. & C.A.Mey.
- Genus Lepidopappus Moc. & Sessé ex DC.
- Genus Lepidophorum Neck. ex DC.
- Genus Lepidopogon Tausch
- Genus Lepidoseris (H. G. L. Reichenbach) Fourr.
- Genus Leptalea D.Don ex Hook. & Arn.
- Genus Leptica E.Mey. ex DC.
- Genus Leptocarpha Endl.
- Genus Leptoclinium Benth.
- Genus Leptorhynchus F.Muell.
- Genus Leptotis Hoffmanns.
- Genus Lerchia Rchb.
- Genus Lestadia Spach accepted as Laestadia Kunth ex Less.
- Genus Lestibodea Neck.
- Genus Lestibudaea Juss.
- Genus Lettowia H.Rob. & Skvarla
- Genus Leucaeria DC.
- Genus Leucampyx A.Gray accepted as Hymenopappus L'Hér.
- Genus Leucanthemum Burm.
- Genus Leucanthemum Burm. ex Kuntze
- Genus Leuceria Lag. accepted as Leucheria Lag.
- Genus Leuchaeria Less.
- Genus Leucoglossum S.Imai
- Genus Leucophyton Less. accepted as Leucophyta R.Br.
- Genus Leucopodon Benth. & Hook.f.
- Genus Leucopodum Gardner accepted as Chevreulia Cass.
- Genus Leucoseris Fourr.
- Genus Leucostemma D.Don
- Genus Leuctodon Auct.
- Genus Leukeria Endl.
- Genus Leyseria Neck.
- Genus Liathris Müll.Berol.
- Genus Libinhania N.Kilian, Galbany, Oberpr. & A.G.Mill.
- Genus Lidbecka Cothen.
- Genus Lidbekia Spreng.
- Genus Lieberkuehna Rchb.
- Genus Lieberkuehnia Rchb.
- Genus Lieberkuhnia Less.
- Genus Limnocrepis Fourr. accepted as Crepis L.
- Genus Limnogenneton Sch.Bip. accepted as Micractis DC.
- Genus Limnoseris 'Peterm.'
- Genus Limonoseris Peterm. accepted as Crepis L.
- Genus Lioydia Neck.
- Genus Lioydia Neck. ex Raf.
- Genus Lipochaete Benth.
- Genus Lipotriche Less. accepted as Lipochaeta DC.
- Genus Lloydia Benth. & Hook.f.
- Genus Locheria Neck.
- Genus Lomanthus B.Nord. & Pelser
- Genus Lomaxeta Raf.
- Genus Lophactis Raf.
- Genus Lophoclinium Endl.
- Genus Lophoptilon Gagnep.
- Genus Lorantea Steud.
- Genus Loranthea Steud.
- Genus Lorentia Sweet
- Genus Luthera Sch.Bip.
- Genus Lycotis Hoffmanns.
- Genus Lyonetia Willk.
- Genus Lyonettia Endl.
- Genus Macrocephalus Lindl.
- Genus Macropertya Honda
- Genus Macrorrhyncus Brongn.
- Genus Madacarpus Wight
- Genus Madaraglossa Hook.
- Genus Madea Sol. ex DC.
- Genus Maecharanthera Pritz.
- Genus Mahometa DC.
- Genus Maja Wedd.
- Genus Malacocephalus Tausch
- Genus Mallinoa J. Coulter accepted as Ageratina Spach
- Genus Mandonia Sch.Bip. accepted as Hieracium Tourn. ex L.
- Genus Margacola Buckley
- Genus Margaritaria Opiz
- Genus Mariacantha Bubani
- Genus Marizia Gand.
- Genus Marschallia Bartl.
- Genus Martrasia Lag. accepted as Jungia L.f.
- Genus Maruta (Cass.) Cass.
- Genus Mastigophorus Cass. accepted as Nassauvia Comm. ex Juss.
- Genus Matamoria La Llave
- Genus Matricaria Hall. ex Scop.
- Genus Matricarioides (Less.) Spach
- Genus Mausolea Bunge ex Podlech
- Genus Medicasia Willk.
- Genus Medicula Medik.
- Genus Medicusia Moench accepted as Picris L.
- Genus Meistera Cothen.
- Genus Meisteria Scop. accepted as Pacourina Aubl.
- Genus Melanenthera Link
- Genus Melissopsis Sch.Bip. ex Baker
- Genus Menomphalus Pomel
- Genus Metagnanthus Endl.
- Genus Metagnathus Benth. & Hook.f.
- Genus Metaxanthus Walp.
- Genus Metazanthus Meyen
- Genus Meteorina Cass. accepted as Dimorphotheca Vaill. ex Moench
- Genus Meyerafra Kuntze
- Genus Michauxia Neck.
- Genus Micrauchenia Froel.
- Genus Microcoecia Hook. accepted as Delilia Spreng.
- Genus Microcoecia Hook.f.
- Genus Microderis D.Don ex Gand.
- Genus Microlecana Sch.Bip. accepted as Bidens L.
- Genus Microlecane Sch.Bip. accepted as Bidens L.
- Genus Microlonchoides P.Candargy
- Genus Microlophopsis Czerep.
- Genus Micropappus (Sch.Bip.) C.F.Baker
- Genus Microrynchus Sch.Bip.
- Genus Miegia Neck.
- Genus Millefolium Tourn. ex Adans.
- Genus Millefolium Hill
- Genus Millera St.-Lag.
- Genus Millera Cothen.
- Genus Millottia Stapf
- Genus Mimela Phil. accepted as Leucheria Lag.
- Genus Minuriella Tate
- Genus Miradoria Sch.Bip. ex Benth. & Hook.f.
- Genus Mischanthus Coss.
- Genus Mitina Adans.
- Genus Mnesitheon Spreng.
- Genus Moehnia Neck.
- Genus Moerkensteinia Opiz
- Genus Molpadia (Cass.) Cass. accepted as Telekia Baumg.
- Genus Monilifera Adans.
- Genus Monophalacrus Cass. accepted as Tessaria Ruiz & Pav.
- Genus Montagnaea DC. accepted as Montanoa Cerv.
- Genus Montagnea Seem.
- Genus Moritzia Sch.Bip. ex Benth. & Hook.f.
- Genus Morna Lindl.
- Genus Moronoa Hort. ex Kunze
- Genus Morrenia Kunze accepted as Mikania Willd.
- Genus Moscaria Pers.
- Genus Moschifera Molina
- Genus Mosigia Spreng.
- Genus Munrozia Steud.
- Genus Mutisa Cothen.
- Genus Myconia Vent.
- Genus Mycropus Gouan
- Genus Mycroseris Hook. & Arn.
- Genus Myctanthes Raf.
- Genus Myoseris Link accepted as Crepis L.
- Genus Myriogyne Less. accepted as Centipeda Lour.
- Genus Nacrea A.Nelson
- Genus Nahuatlea V.A.Funk
- Genus Namibithamnus H.Rob., Skvarla & V.A.Funk
- Genus Narbalia Raf.
- Genus Nassavia Spreng.
- Genus Nassawia Lag.
- Genus Nassovia Batsch
- Genus Neactelis Raf.
- Genus Nematopus A.Gray
- Genus Nemolepis E.Vilm.
- Genus Neobartlettia R.M.King & H.Rob. accepted as Bartlettina R.M.King & H.Rob.
- Genus Neo-taraxacum Y.R.Ling & X.D.Sun
- Genus Neurelmis Raf.
- Genus Neurochlaena Less.
- Genus Newtonia O.Hoffm.
- Genus Nicolettia Benth. & Hook.f.
- Genus Niebuhria Neck. ex Britton accepted as Wedelia Jacq.
- Genus Niebuhria Neck. accepted as Wedelia Jacq.
- Genus Noccaea Kuntze accepted as Lagascea Cav. (1)
- Genus Nothonia Endl.
- Genus Notisia P.S.Short (1)
- Genus Obaejaca (Cass.) Cass. accepted as Senecio L.
- Genus Obeliscaria Cass. accepted as Ratibida Raf.
- Genus Obeliscotheca Vaill. ex Adans. accepted as Rudbeckia L. (1)
- Genus Obelisteca Raf. accepted as Ratibida Raf.
- Genus Oboejaca Steud.
- Genus Ocneron Raf.
- Genus Odoglossa Raf.
- Genus Odontocarpha Poepp. ex DC. accepted as Gutierrezia Lag.
- Genus Odontophyllum (Less.) Spach
- Genus Odontoptera Cass. accepted as Arctotis L.
- Genus Oederia DC.
- Genus Oegroe Phil.
- Genus Ogcerostylus Cass. accepted as Siloxerus Labill.
- Genus Oligaerion Cass.
- Genus Oliganthemum F.Muell. accepted as Pluchea Cass.
- Genus Oligocarpha Cass. accepted as Brachylaena R.Br.
- Genus Oligodorella Turcz.
- Genus Oligodorum Spach
- Genus Oligoglossa DC.
- Genus Oligotheca
- Genus Onopix Raf.
- Genus Onopyxos Spreng.
- Genus Onopyxus Bubani
- Genus Ooclinium DC. accepted as Praxelis Cass.
- Genus Ophyrosporus Baker
- Genus Opicrina Raf.
- Genus Oporina Less.
- Genus Oporinea W.H.Baxter
- Genus Orchaenactis "coville" ex O.Hoffm.
- Genus Oreodoxa
- Genus Oreophila D.Don accepted as Hypochaeris L.
- Genus Oreoseris DC.
- Genus Oresigonia Willd. ex DC. accepted as Senecioneae Cass.
- Genus Oresigonia Willd. ex Less.
- Genus Orestion Raf.
- Genus Oriastrum Poepp. (1)
- Genus Orsina Bertol. accepted as Inula L.
- Genus Osmia Sch.Bip. accepted as Chromolaena DC.
- Genus Osmitiphyllum Sch.Bip.
- Genus Osteiza Steud.
- Genus Oswaldia Cass. accepted as Clibadium F.Allam. ex L.
- Genus Oswaldia Less. accepted as Clibadium F.Allam. ex L.
- Genus Otoglyphis Pomel
- Genus Oxerostylus Steud.
- Genus Oxiphoeria Hort. ex Dum.Cours.
- Genus Oxodon Steud.
- Genus Oxylaena Benth.
- Genus Oxylobus Moc. ex DC.
- Genus Oxyodon DC. accepted as Chaptalia Vent.
- Genus Oxyphaeria Steud.
- Genus Oxypheria DC.
- Genus Oxyphoeria Dum.Cours.
- Genus Oxytripolium Anonymous
- Genus Pachycentron Pomel
- Genus Pachychaeta Sch.Bip. ex Baker
- Genus Pachyderis Cass. accepted as Pteronia L.
- Genus Pachylepis Less. accepted as Crepis L.
- Genus Pachyrhynchus DC. accepted as Lucilia Cass.
- Genus Pachyrynchus Steud.
- Genus Pachysurus Steetz
- Genus Pachythrix Hook.f.
- Genus Pacquerina Cass. ex Sond.
- Genus Paleolaria Cass. accepted as Palafoxia Lag.
- Genus Panargyrum D.Don accepted as Nassauvia Comm. ex Juss.
- Genus Panargyrus Lag.
- Genus Paneroa E.E.Schill.
- Genus Panetia Fenzl
- Genus Paniopsis Raf.
- Genus Panios Adans.
- Genus Paquerina Cass. accepted as Bellis L. (1)
- Genus Paquirea Panero & S.E.Freire
- Genus Parasenaria J.M.H.Shaw
- Genus Parasyncalathium J.W. Zhang, Boufford & H.Sun (1)
- Genus Pardisium Burm.f.
- Genus Parthenopsis Kellogg
- Genus Passacardoa Wild accepted as Pasaccardoa Kuntze
- Genus Pegolletia Less.
- Genus Penanthes Vell.
- Genus Pentanthus Hook. & Arn.
- Genus Pentanthus Less.
- Genus Pentataxis D.Don
- Genus Penthanthus Steud.
- Genus Pentheriella O.Hoffm. & Muschl.
- Genus Pentiphragma Hook.
- Genus Pereuphora Hoffmanns.
- Genus Pereziopsis Coult. accepted as Onoseris Willd.
- Genus Pericallis Webb & Berthel.
- Genus Perimenium Steud.
- Genus Peripleura Clifford & Ludlow
- Genus Peritris Raf.
- Genus Personaria Lam.
- Genus Perymeniopsis Sch.Bip. ex Klatt
- Genus Petalactella N.E.Br. accepted as Ifloga Cass.
- Genus Petalolepis Cass. accepted as Ozothamnus R.Br.
- Genus Petalolepis Less.
- Genus Petasitis Mill.
- Genus Petrantha DC.
- Genus Petrodavisia Holub
- Genus Petrollinia Chiov. accepted as Inula L.
- Genus Petronia Jungh.
- Genus Peurousea Steud.
- Genus Phacellothrix F.Muell. accepted as Helichrysum Mill. (1)
- Genus Phaenopoda Cass. accepted as Podosperma Labill.
- Genus Phaethusia Raf.
- Genus Phaetusa Schreb.
- Genus Phalacroglossum Sch.Bip.
- Genus Phalacromesus Cass. accepted as Tessaria Ruiz & Pav.
- Genus Pharia Steud.
- Genus Phenopus Hook.f.
- Genus Phialis Spreng. accepted as Trichophyllum Nutt.
- Genus Philaginopsis Walp.
- Genus Phoenicopus Spach
- Genus Phoenicoseris (Skottsb.) Skottsb. accepted as Sonchus L.
- Genus Phoenixopus Rchb.
- Genus Phoenocoma G.Don
- Genus Phoenopus Nyman
- Genus Phrenanthes Wigg.
- Genus Phyllactinia Benth.
- Genus Phyllactis Steud.
- Genus Phyllochilium Cabrera accepted as Chiliophyllum Phil.
- Genus Phyllopappus Walp.
- Genus Phyllostelidium Beauverd
- Genus Phyllymena Blume ex Miq.
- Genus Picardenia Steud.
- Genus Picrina Rchb. ex Steud.
- Genus Pietrosia Nyár. accepted as Andryala L.
- Genus Pietrosia Nyár.
- Genus Pilosanthus Steud.
- Genus Pilosella F.W.Schultz & Sch.Bip.
- Genus Pinardia Neck.
- Genus Pinillosia Ossa
- Genus Piptopogon Cass. accepted as Hypochaeris L.
- Genus Piptostemma (D.Don) Spach
- Genus Piptostemum Steud.
- Genus Pirarda Adans.
- Genus Pitchia Auct.
- Genus Plagion St.-Lag.
- Genus Plancia Neck.
- Genus Platzchaeta Sch.Bip.
- Genus Pleocarpus Walp.
- Genus Pluechea Zoll. & Moritzi
- Genus Pluridens Neck.
- Genus Podia Neck.
- Genus Poecilotriche Dulac
- Genus Pogonura DC. ex Lindl.
- Genus Poilania Gagnep.
- Genus Polatherus Raf.
- Genus Poljakanthema Kamelin
- Genus Poloa DC.
- Genus Polyacantha Hill
- Genus Polyachris Walp.
- Genus Polycalymma F.Muell. ex Sond.
- Genus Polycantha Hill
- Genus Polyclados Phil. accepted as Parastrephia Nutt.
- Genus Polymniastrum Small accepted as Smallanthus Mack.
- Genus Polypappus Nutt.
- Genus Polypteris Nutt.
- Genus Polypteris Less. accepted as Gaillardia Foug.
- Genus Ponaea Bubani
- Genus Pontesia Vell. accepted as Riencourtia Cass.
- Genus Portalesia Meyen
- Genus Postia Boiss. & C.I.Blanche
- Genus Praenanthes Hook.
- Genus Prenanthenia Svent.
- Genus Prenanthos St.-Lag.
- Genus Prenantus Raf.
- Genus Prestinaria Sch.Bip. ex Hochst.
- Genus Prianthes Pritz.
- Genus Priestleya ex DC.
- Genus Prionolepis Poepp. & Endl.
- Genus Proselia D.Don
- Genus Protolepis Steud.
- Genus Psanacetum Neck.
- Genus Pseudalomia Zoll. & Moritzi
- Genus Pseudevax DC. ex Steud.
- Genus Pseudoclinium Kuntze
- Genus Pseudoglossanthis Poljakov (1)
- Genus Pseudomatricaria Domin
- Genus Pseudopegolettia H.Rob., Skvarla & V.A.Funk
- Genus Pseudoseris Baill.
- Genus Psilachenia Benth.
- Genus Psilochenia Nutt. accepted as Crepis L.
- Genus Psilochlaena Walp.
- Genus Psilopogon Phil. accepted as Picrosia D.Don
- Genus Psilosanthus Neck.
- Genus Psilothamnus DC.
- Genus Psilothonna E.Mey. ex DC.
- Genus Psora Hill
- Genus Ptarmica Neck.
- Genus Pterigeron A.Gray
- Genus Pternix Hill
- Genus Pternix Raf.
- Genus Pterochaete Boiss.
- Genus Pterocladis Lamb. ex G.Don
- Genus Pteropappus Pritz.
- Genus Pterophora Neck.
- Genus Pterophorus Vaill. ex Adans.
- Genus Pterophyton Cass. accepted as Verbesina L.
- Genus Pteropogon Fenzl
- Genus Pterosenecio Sch.Bip. ex Baker
- Genus Pterostephanus Kellogg
- Genus Ptilepida Raf.
- Genus Ptileris Raf. accepted as Erechtites Raf.
- Genus Ptilocalais Torr. ex Greene accepted as Microseris D.Don
- Genus Ptilophora (Torr. & A.Gray ex Hook.) A.Gray accepted as Microseris D.Don
- Genus Ptiloria Raf. accepted as Stephanomeria Nutt. (1)
- Genus Ptilosia Tausch
- Genus Ptilurus D.Don accepted as Leucheria Lag.
- Genus Publicaria Deflers
- Genus Pulicaria Gaertn. ex Schreb.
- Genus Pulicarioidea Bunwong, Chantar. & S.C.Keeley
- Genus Pumilo Schltdl.
- Genus Pycarda Less.
- Genus Pycnocomon St.-Lag.
- Genus Pycnocomus Hill
- Genus Pyrarda Cass. accepted as Grangea Adans.
- Genus Pyrethraria Pers. ex Steud.
- Genus Pyrethron St.-Lag.
- Genus Pyrethropsis (1)
- Genus Pyrethrum Scop.
- Genus Pyrethrum Hall.
- Genus Pyretrum Burm.
- Genus Pyropsis Hort. ex Fisch., C.A.Mey. & Avé-Lall.
- Genus Pyrrhocoma Wall.
- Genus Pyrrhopappus A.Rich.
- Genus Pythecoseris Spach
- Genus Raillarda Endl.
- Genus Raillardella Benth.
- Genus Railliarda DC.
- Genus Raoulia Hook.f.
- Genus Ratabida Loudon
- Genus Razumovia Spreng.
- Genus Razumovia Spreng. ex Juss.
- Genus Rea Bertero ex Decne. accepted as Dendroseris D.Don
- Genus Reicharda Cothen.
- Genus Reichardia Roth.
- Genus Resinocaulon Lunell
- Genus Rhagadiolus Zinn
- Genus Rhagadiolus Tourn. ex Scop.
- Genus Rhantherium Sch.Bip.
- Genus Rhea Endl.
- Genus Rhigiothamnus (Less.) Spach
- Genus Rhinactina Willd. accepted as Jungia L.f. (2)
- Genus Rhodactinia Benth. & Hook.f.
- Genus Rhyditospermum Walp.
- Genus Rhynchopappus Dulac accepted as Crepis L.
- Genus Rhynchospermum Reinw.
- Genus Ridan Kuntze
- Genus Ridania Kuntze
- Genus Riddelliinae O.Hoffm.
- Genus Roberta St.-Lag.
- Genus Roccardia Neck. ex Raf.
- Genus Roccardia Neck.
- Genus Rodigia Spreng accepted as Crepis L.
- Genus Roebuckia P.S.Short accepted as Brachyscome Cass.
- Genus Roebuckiella P.S.Short
- Genus Rolfinkia Zenker
- Genus Rosaura Noronha
- Genus Rothia Schreb. accepted as Andryala L.
- Genus Rothia Lam. accepted as Hymenopappus L'Hér.
- Genus Rudbecka Cothen.
- Genus Rudbekia Scop.
- Genus Ruthrum Hill
- Genus Rutidochlamys Sond.
- Genus Rytidea Spreng.
- Genus Sabbata Vell.
- Genus Salmia Post & Kuntze
- Genus Salviastrum Heist. ex Fabr.
- Genus Sanhilaria leandr. ex DC.
- Genus Sanrobertia G.L.Nesom
- Genus Santolina Tourn.
- Genus Santonica Griff.
- Genus Sanvitalia L.
- Genus Scalia Sieber ex Sims
- Genus Scaliopsis Walp.
- Genus Scepinia Neck. ex Cass. accepted as Pteronia L.
- Genus Scepinia Neck.
- Genus Schaeffnera Benth. & Hook.f.
- Genus Schaetzelia Walp.
- Genus Schaetzelia Sch.Bip.
- Genus Schaetzellia Sch.Bip.
- Genus Schaffnera Sch.Bip.
- Genus Schawia Cothen.
- Genus Scheuchleria Heynh.
- Genus Schistocarpia Pritz.
- Genus Schkuhria Roth.
- Genus Schlechtendahlia Benth. & Hook.f.
- Genus Schmidtia Moench accepted as Tolpis Adans.
- Genus Schnittspahnia Sch.Bip.
- Genus Schortia Hort. ex E.Vilm.
- Genus Sciadioseris Kunze
- Genus Sciadoseris Müll.Berol.
- Genus Scirrhophorus Turcz.
- Genus Sckuhria Moench
- Genus Sclerobasis Cass. accepted as Senecio L.
- Genus Scleroleima Hook.f.
- Genus Sclerolepis Monnier accepted as Crepis L.
- Genus Sclerolepis Monn.
- Genus Sclerophyllum Gaudin accepted as Crepis L.
- Genus Scolopospermum Hemsl. accepted as Baltimora L.
- Genus Scolymanthus Willd. ex DC. accepted as Perezia Lag.
- Genus Scytala E.Mey. ex DC.
- Genus Sebastiana Benth. & Hook.f. accepted as Chrysanthellum Rich.
- Genus Sebastiania Bertol.
- Genus Selenocera Zipp. ex Span.
- Genus Selenogyne DC.
- Genus Senecillicacalia Kitam.
- Genus Seneciunculus Opiz
- Genus Seneico Hill
- Genus Sericocarpus Greene (1)
- Genus Seridia Juss. accepted as Centaurea L.
- Genus Seriphidium (Besser) Poljakov
- Genus Seruneum Rumph.
- Genus Setachna Dulac
- Genus Seubertia H.C.Watson
- Genus Shawia Forst. (2)
- Genus Sidneya E.E.Schill. & Panero
- Genus Siegesbecka Cothen.
- Genus Siegesbeckia Steud.
- Genus Silphion St.-Lag.
- Genus Silphiosperma Steetz
- Genus Silybon St.-Lag.
- Genus Simblocline DC. accepted as Diplostephium Kunth
- Genus Simlera Bubani
- Genus Sincalia
- Genus Sinclairea Sch.Bip.
- Genus Siphonogyne Cass.
- Genus Sitilias Raf. accepted as Pyrrhopappus DC.
- Genus Skirrhophorus DC. ex Lindl.
- Genus Skirrophorus Müll.Berol.
- Genus Sobreya Pers. accepted as Enydra Lour.
- Genus Sobrya Pers.
- Genus Sogaligna Steud.
- Genus Soldevilla Lag.
- Genus Solidaster Wehrhahn
- Genus Solivaea Cass. accepted as Soliva Ruiz & Pav.
- Genus Sonchidium Pomel accepted as Sonchus L.
- Genus Sonchos St.-Lag.
- Genus Sonchoseris Fourr. accepted as Sonchus L.
- Genus Sonchustenia Svent.
- Genus Sonnea Greene
- Genus Soyera St.-Lag.
- Genus Soyeria Monn.
- Genus Spadactis Cass. accepted as Atractylis L.
- Genus Spadactis Cass. ex Less.
- Genus Spanioptilon Less.
- Genus Spanotrichum E.Mey. ex DC.
- Genus Spermophylla Neck.
- Genus Sphaeranthoides A.Cunn. ex DC.
- Genus Sphaereupatorium Kuntze
- Genus Sphaerocephala Hill
- Genus Sphaerocephalus Kuntze
- Genus Sphaerocephalus Lag. ex DC.
- Genus Sphaerophyllum Auct.
- Genus Spheranthus Hill
- Genus Spilacron Cass. accepted as Centaurea L.
- Genus Spilanthus L.
- Genus Spinoliva G.Sancho, Luebert & Katinas
- Genus Spiralepis D.Don
- Genus Spiridanthus Fenzl
- Genus Sprunira Sch.Bip. ex Hochst.
- Genus Sprunnera Sch.Bip. ex Walp.
- Genus Sprunnera Sch.Bip.
- Genus Staebe Hill
- Genus Stanfieldia Small
- Genus Starkia Juss. ex Steud.
- Genus Stegonotus Cass. accepted as Arctotis L.
- Genus Steiractis Raf.
- Genus Steirocoma (DC.) Rchb.
- Genus Steiroglossa DC.
- Genus Steleocodon Gilli
- Genus Stelmanis Raf.
- Genus Stematella Wedd. ex Sch.Bip. accepted as Galinsoga Ruiz & Pav.
- Genus Stemmatella Wedd. ex Sch.Bip.
- Genus Stemmatella Wedd. ex Benth.
- Genus Stenogyne Cass.
- Genus Stenotheca Monn.
- Genus Stenotopsis Rydb. accepted as Ericameria Nutt.
- Genus Stephania (Kuntze) Kuntze
- Genus Stephanocoma Less.
- Genus Stephanopholis S.F.Blake (1)
- Genus Steriphe Phil.
- Genus Stictophyllum Edgew.
- Genus Stilpnophytum Less. accepted as Athanasia L.
- Genus Stoechas Gueldenst.
- Genus Strabonia DC.
- Genus Streckera Sch.Bip.
- Genus Streptorhamphus Regel
- Genus Strongyloma DC.
- Genus Strongylomopsis Speg.
- Genus Strumarium Raf.
- Genus Stylesia Nutt. accepted as Bahia Lag.
- Genus Stylopappus Nutt. accepted as Agoseris Raf.
- Genus Succisocrepis Fourr. accepted as Crepis L.
- Genus Sulzeria J. J. Roemer & J. A. Schultes
- Genus Susanna E.Phillips
- Genus Swertia All.
- Genus Swertia Boehm.
- Genus Swertya Steud.
- Genus Swinburnia Ewart
- Genus Sycodium Pomel
- Genus Symphipappus Klatt (1)
- Genus Synarthron Benth. & Hook.f.
- Genus Synarthrum Cass. accepted as Senecio L.
- Genus Syncephalanthus Benth. & Hook.f.
- Genus Synchodendron Bojer ex DC.
- Genus Synosma Raf. ex Britton accepted as Hasteola Raf.
- Genus Synosma Raf.
- Genus Tafalla D.Don accepted as Loricaria Wedd.
- Genus Tagetinae Less.
- Genus Taimingasa (Kitam.) C.Ren & Q.E.Yang
- Genus Tamayoa V.M.Badillo
- Genus Tanaxion Raf.
- Genus Taraxacum Weber
- Genus Teichostemma R.Br.
- Genus Telfordia accepted as Ozothamnus R.Br.
- Genus Terana La Llave
- Genus Tessenia Bubani (1)
- Genus Tetracanthus C.Wright ex Griseb.
- Genus Tetralix Hill
- Genus Tetralyx Hill
- Genus Tetrantha Poit. ex DC. accepted as Riencourtia Cass.
- Genus Tetratrichia Dinter
- Genus Thamnoseris F.Phil.
- Genus Thelosperma Post & Kuntze
- Genus Thelythamnos A.Spreng.
- Genus Theophroseris Andrae
- Genus Therogeron DC.
- Genus Therolepta Raf.
- Genus Thespidium F.Muell. ex Benth.
- Genus Thinobia Phil.
- Genus Thlipsocarpus Kunze accepted as Hyoseris L.
- Genus Thouarsia Vent. ex DC.
- Genus Thrica Gray
- Genus Thrincia Roth. accepted as Leontodon L.
- Genus Thrixia Dulac
- Genus Thuraria [Nutt.]
- Genus Thymophyllum Benth. & Hook.f.
- Genus Thyopsis Ascherson & Graebner
- Genus Thyopsis Wedd.
- Genus Thyrsanthema Neck. ex Kuntze
- Genus Thysanurus O.Hoffm.
- Genus Thysopsis Wedd. accepted as Loricaria Wedd.
- Genus Timanthea Salisb. accepted as Baltimora L.
- Genus Tola Wedd. ex Benth. & Hook.f.
- Genus Tolbonia Kuntze accepted as Calotis R.Br. (1)
- Genus Toxacanthus (2)
- Genus Toxanthus Benth.
- Genus Trachodes D.Don accepted as Sonchus L. (1)
- Genus Tragantha Wallr. ex Endl.
- Genus Traganthes Wallr.
- Genus Tragoceras Spreng. accepted as Isostigma Less.
- Genus Tragopogonodes Kuntze
- Genus Tragopogum St.-Lag.
- Genus Triachne Cass. accepted as Nassauvia Comm. ex Juss.
- Genus Trianthus Hook.f.
- Genus Trichandrum Neck.
- Genus Trichocrepis Vis. accepted as Crepis L.
- Genus Trichoseris Poepp. & Endl.
- Genus Trichoseris Sch.Bip.
- Genus Trichostegia Turcz.
- Genus Trichostephus Cass. accepted as Wedelia Jacq.
- Genus Trigonopterum Steetz ex Andersson
- Genus Trigonotheca Sch.Bip.
- Genus Trimorphoea Benth. & Hook.f.
- Genus Trinacte Gaertn. accepted as Jungia L.f.
- Genus Trinciatella Adans.
- Genus Tripleurocota Starm.
- Genus Tripolion Raf.
- Genus Tripterachaenium Kuntze
- Genus Triptilium DC.
- Genus Trixis Sw. accepted as Clibadium F.Allam. ex L. (1)
- Genus Trixis Lag.
- Genus Trochoseris Poepp. & Endl. ex Endl.
- Genus Tropidolepis Tausch
- Genus Troximon Nutt.
- Genus Troximon [Nutt.]
- Genus Troximum Steud.
- Genus Trychinolepis B.L.Rob. accepted as Ophryosporus Meyen
- Genus Tuberostyles Benth. & Hook.f. (1)
- Genus Tubilium Cass. accepted as Pulicaria Gaertn.
- Genus Tulakenia Raf.
- Genus Tumionella Greene
- Genus Turanecio Hamzaoglu
- Genus Turpinia Lex.
- Genus Tylloma D.Don
- Genus Ubiaea J.Gay ex J.Gay
- Genus Ucacea Cass.
- Genus Uhdea Kunth accepted as Montanoa Cerv.
- Genus Ulina Opiz
- Genus Uniyala H.Rob. & Skvarla
- Genus Unxia Bertero ex Colla
- Genus Unxia Kunth
- Genus Urbanisol Kuntze accepted as Piptocarpha R.Br. (1)
- Genus Urostylis Meisn.
- Genus Vartheimia Benth. & Hook.f.
- Genus Varthemia Caruel
- Genus Vasquesia Phil. accepted as Unxia L.f.
- Genus Vasquesia Rydb.
- Genus Vazquezia Pritz.
- Genus Vea
- Genus Veltis Adans.
- Genus Venatris Raf.
- Genus Vendredia Baill.
- Genus Venegazia Benth. & Hook.f.
- Genus Vernasolis Raf.
- Genus Verutina Cass. accepted as Centaurea L.
- Genus Viborgia Spreng. accepted as Galinsoga Ruiz & Pav.
- Genus Vieria Webb ex Sch.Bip.
- Genus Villanovaea Post & Kuntze
- Genus Villaria DC.
- Genus Viraya Gaudich.
- Genus Virga-aurea Rupp.
- Genus Virgaria Raf. ex DC. accepted as Symphyotrichum Nees
- Genus Virgaurea Rupp.
- Genus Virgilia L'Hér.
- Genus Virletia Sch.Bip. ex Benth. & Hook.f. accepted as Bahia Lag.
- Genus Vittadenia Steud.
- Genus Voigtia Roth
- Genus Vosacan Adans.
- Genus Vosakan Adans.
- Genus Wahlenbergia Schumach. accepted as Enydra Lour.
- Genus Warthemia Boiss.
- Genus Wendelboa Soest accepted as Taraxacum Weber ex F.H.Wigg.
- Genus Wernera Kuntze accepted as Senecioneae Cass.
- Genus Wettsteinia Petr.
- Genus Wibelia Roehl.
- Genus Wiestia Sch.Bip. accepted as Lactuca L. (1)
- Genus Wigandia Neck. ex Less.
- Genus Wigandia Neck.
- Genus Wightia Spreng. ex DC.
- Genus Wikstroemia Spreng. accepted as Mikania Willd.
- Genus Willdenowia Steud.
- Genus Willkommia Sch.Bip. ex Nyman
- Genus Wirtgenia Sch.Bip. accepted as Wedelia Jacq.
- Genus Wollastonia DC. ex Decne.
- Genus Wootonella Standl. accepted as Verbesina L.
- Genus Wootonia Greene
- Genus Wurdackia Moldenke
- Genus Wurmschnittia Benth.
- Genus Xalkitis Raf.
- Genus Xantho J.Rémy
- Genus Xantholepis Willd. ex Less.
- Genus Xantium Gilib.
- Genus Xantophtalmum Sang.
- Genus Xenophonta Benth. & Hook.f.
- Genus Xeranthium Lepech.
- Genus Xeropappus Wall.
- Genus Xerotium Bluff & Fingerhuth
- Genus Xetoligus Raf.
- Genus Xylanthema Neck.
- Genus Xylothermia Greene
- Genus Yermo Dorn
- Genus Youngia Cass. descr. ampl. Babc. & Stebbins
- Genus Zacyntha Adans.
- Genus Zalucania Steud.
- Genus Zarabellia Neck. accepted as Berkheya Ehrh.
- Genus Zazintha Hall.
- Genus Zeyheria A.Spreng. accepted as Geigeria Griess.
