Achyrophorus roseus Less. accepted as Pinaropappus roseus (Less.) Less. (original description)
Aldama dentata Less. (original description)
Ambrosiinae Less. (original description)
Anandria Siegesb. ex Less. accepted as Leibnitzia Cass. (original description)
Anandria discoidea Less. (original description)
Anandria radiata Less. (original description)
Artemisia mecicana Less. (original description)
Aster asperrimus Less. (original description)
Aster inconspicuus Less. accepted as Symphyotrichum subulatum var. parviflorum (Nees) S.D.Sundb. (original description)
Aster jamaicensis (L.) Less. accepted as Erigeron jamaicensis L. (original description)
Aster rivularis Less. accepted as Erigeron procumbens (Houst. ex Mill.) G.L.Nesom (original description)
Aster scaberrimus Less. accepted as Erigeron veracruzensis G.L.Nesom (original description)
Baccharidinae Less. (original description)
Baccharis parviflora Less. accepted as Baccharis serrifolia DC. (original description)
Baccharis philippensis Less. ex Schltdl. & Cham. (original description)
Baccharis scandens Less. accepted as Archibaccharis schiedeana (Benth.) J.D.Jacks. (original description)
Bahia artemisiifolia Less. accepted as Eriophyllum stoechadifolium Lag. (original description)
Bahia sinuata Less. accepted as Loxothysanus sinuatus (Less.) B.L.Rob. (original description)
Barnadesia dombeyana Less. (original description)
Bidens dondiifolia Less. accepted as Bidens pilosa f. dondiifolia (Less.) Sherff (original description)
Bidens squarrosa Less. (original description)
Cacalia sagittifolia Mertens (original description)
Calea cacosmoides Less. accepted as Calea urticifolia (Mill.) DC. (original description)
Calea cymosa Less. (original description)
Calea multiplinervia Less. (original description)
Calea nitida Less. (original description)
Calea serrata Less. (original description)
Calea sessiliflora Less. (original description)
Calea uniflora Less. (original description)
Caleacte rotundifolia Less. accepted as Calea rotundifolia (Less.) Baker (original description)
Carduus lappoides Less. accepted as Cirsium lappoides (Less.) Sch.Bip. (original description)
Carduus pyrochros Less. accepted as Cirsium conspicuum (G.Don) Sch.Bip. (original description)
Carduus subcoriaceus Less. accepted as Cirsium subcoriaceum (Less.) Sch.Bip. ex Sch.Bip. (original description)
Chaetanthera incana Poepp. ex Less. (original description)
Chaetanthera spathulata Poepp. ex Less. accepted as Chaetanthera incana Poepp. ex Less. (original description)
Chevreulia acuminata Less. (original description)
Chuquiraga spinosa Less. (original description)
Crassocephalum valerianifolium (Link ex Wolf) Less. accepted as Erechtites valerianifolius (Link ex Wolf) Less. ex DC. (original description)
Cynareae Less. accepted as Cardueae Cass. (original description)
Diacantha Less. accepted as Barnadesia Mutis ex L.f. (original description)
Diacantha arborea (Kunth) Less. accepted as Barnadesia arborea Kunth (original description)
Dicoma burmanni Less. (original description)
Dicoma capensis Less. (original description)
Dicoma diacanthoides Less. accepted as Macledium spinosum (L.) S.Ortiz (original description)
Dicoma radiata Less. accepted as Dicoma picta (Thunb.) Druce (original description)
Dicoma relhanioides Less. accepted as Macledium relhanioides (Less.) S.Ortiz (original description)
Diplopappus graminifolius (Michx.) Less. accepted as Pityopsis graminifolia (Michx.) Nutt. (original description)
Dizonium Willd. ex Schltdl. accepted as Geigeria Griess. (original description)
Dizonium longifolium Willd. accepted as Geigeria ornativa O.Hoffm. (original description)
Dumerilia Less. accepted as Perezia Lag. (original description)
Dumerilia humboldtii Less. accepted as Acourtia humboldtii (Less.) B.L.Turner (original description)
Epaltes australis Less. (original description)
Epaltes mexicana Less. (original description)
Erigeron schiedeanus Less. accepted as Laennecia schiedeana (Less.) G.L.Nesom (original description)
Eupatorium divergens Less. accepted as Chromolaena odorata (L.) R.M.King & H.Rob. (original description)
Eupatorium macrocephalum Less. accepted as Campuloclinium macrocephalum (Less.) DC. (original description)
Eupatorium micranthum Less. accepted as Ageratina ligustrina (DC.) R.M.King & H.Rob. (original description)
Eupatorium oliganthes Less. accepted as Brickellia oliganthes (Less.) A.Gray (original description)
Flotovia lanceolata Less. accepted as Dasyphyllum lanceolatum (Less.) Cabrera (original description)
Flotovia spinescens Less. accepted as Dasyphyllum spinescens (Less.) Cabrera (original description)
Fulcaldea tomentosa (Lex.) Less. accepted as Vernonia paniculata DC. (original description)
Geigeria Griess. (original description)
Geigeria africana Griess. accepted as Geigeria ornativa O.Hoffm. (original description)
Gerbera cordata (Thunb.) Less. (original description)
Gerbera hirsuta (Forssk.) Less. accepted as Gerbera piloselloides (L.) Cass. (original description)
Gerbera microcephala Less. (original description)
Gerbera sinuata Less. accepted as Gerbera serrata (Thunb.) Druce (original description)
Gochnatia cordata Less. accepted as Moquiniastrum cordatum (Less.) G. Sancho (original description)
Gochnatia corymbosa Less. accepted as Ianthopappus corymbosus (Less.) Roque & D.J.N.Hind (original description)
Gochnatia ilicifolia Less. (original description)
Gochnatia spectabilis (D.Don) Less. (original description)
Grindelia coronopifolia Lehm. accepted as Xanthocephalum centauroides Willd. (original description)
Gymnolomia microcephala Less. accepted as Hymenostephium microcephalum (Less.) S.F.Blake (original description)
Heterothalamus Less. accepted as Baccharis L. (original description)
Hieracium abscissum Less. (original description)
Hieracium mexicanum Less. (original description)
Isocarpha Less. accepted as Ageratum L. (original description)
Isocarpha echioides Less. accepted as Ageratum echioides (Less.) Hemsl. (original description)
Iva asperifolia Less. (original description)
Joannea triplinervis Spreng. ex Less. (original description)
Jungia floribunda Less. (original description)
Jungia rugosa Less. (original description)
Lagurostemon liatroides Fisch. ex Wydler (original description)
Lasiorrhiza purpurea (Vahl) Less. accepted as Leucheria purpurea (Vahl) Hook. & Arn. (original description)
Lasiorrhiza tomentosa Less. accepted as Leucheria tomentosa (Less.) Crisci (original description)
Leria nutans Less. (original description)
Leria nutans var. integrifolia (Cass.) Less. accepted as Chaptalia integerrima (Vell.) Burkart (original description)
Leuchaeria Less. (original description)
Lorentea Less. accepted as Pectis L. (original description)
Lorentea saturejoides Less. (original description)
Lucilia gnaphalioides Less. accepted as Berroa gnaphalioides (Less.) Beauverd (original description)
Lucilia nitens Less. (original description)
Lycoseris denticulata Less. (original description)
Lycoseris triplinervia Less. (original description)
Melampodium manillense Less accepted as Melampodium diffusum Cass. (original description)
Mutisia campanulata Less. (original description)
Mutisia sinuata Willd. ex Less. (original description)
Mutisia speciosa f. dealbata Less. (original description)
Mutisia taraxacifolia Less. accepted as Mutisia sinuata Cav. (original description)
Oldenburgia Less. (original description)