Achillea angustissima Rydb. (original description)
Achillea fusca Rydb. (original description)
Achillea nigrescens (E.Mey.) Rydb. (original description)
Achillea pacifica Rydb. accepted as Achillea millefolium L. (original description)
Achillea palmeri Rydb. accepted as Achillea millefolium L. (original description)
Achillea puberula Rydb. accepted as Achillea millefolium L. (original description)
Artemisia alaskana Rydb. (original description)
Artemisia angusta Rydb. accepted as Artemisia tridentata subsp. tridentata Nutt. (original description)
Artemisia argophylla Rydb. (original description)
Artemisia camporum Rydb. accepted as Artemisia campestris var. pacifica (Nutt.) M.Peck (original description)
Artemisia comata Rydb. accepted as Artemisia norvegica subsp. saxatilis (Besser) H.M.Hall & Clem. (original description)
Artemisia cooleyae Rydb. (original description)
Artemisia cuneata Rydb. accepted as Artemisia ludoviciana subsp. ludoviciana Nutt. (original description)
Artemisia falcata Rydb. accepted as Artemisia ludoviciana subsp. ludoviciana Nutt. (original description)
Artemisia flodmanii Rydb. accepted as Artemisia indica Willd. (original description)
Artemisia ghiesbreghtii Rydb. accepted as Artemisia ludoviciana Nutt. (original description)
Artemisia gormanii Rydb. accepted as Artemisia tilesii Ledeb. (original description)
Artemisia gracillima Rydb. (original description)
Artemisia hyperborea Rydb. accepted as Artemisia furcata M.Bieb. (original description)
Artemisia leibergii Rydb. (original description)
Artemisia maccallae Rydb. (original description)
Artemisia manca Rydb. (original description)
Artemisia mexicana var. latifolia Sch.Bip. (original description)
Artemisia minuta Rydb. (original description)
Artemisia muelleri Rydb. accepted as Artemisia ludoviciana Nutt. (original description)
Artemisia neomexicana Greene (original description)
Artemisia neomexicana Greene ex Rydb. accepted as Artemisia ludoviciana subsp. mexicana (Willd. ex Spreng.) D.D.Keck (original description)
Artemisia obtusa Rydb. (original description)
Artemisia platyphylla Rydb. accepted as Artemisia ludoviciana Nutt. (original description)
Artemisia revoluta Rydb. accepted as Artemisia ludoviciana Nutt. (original description)
Artemisia ripicola Rydb. accepted as Artemisia campestris var. pacifica (Nutt.) M.Peck (original description)
Artemisia sect. Filifoliae Rydb. (original description)
Artemisia sect. Franserioides Rydb. (original description)
Artemisia sect. Lanatae Rydb. (original description)
Artemisia sect. Pygmaeae Rydb. (original description)
Artemisia sect. Rigidae Rydb. (original description)
Artemisia subg. Dracunculus (Besser) Rydb. (original description)
Artemisia sulcata Rydb. accepted as Artemisia ludoviciana subsp. sulcata (Rydb.) D.D.Keck (original description)
Artemisia tacomensis Rydb. accepted as Artemisia furcata M.Bieb. (original description)
Artemisia texana Rydb. (original description)
Artemisia tyrrellii Rydb. accepted as Artemisia alaskana Rydb. (original description)
Artemisia unalaskensis Rydb. accepted as Artemisia tilesii Ledeb. (original description)
Artemisia vaseyana Rydb. accepted as Artemisia tridentata subsp. vaseyana (Rydb.) Beetle (original description)
Artemisiastrum Rydb. accepted as Artemisia L. (original description)
Artemisiastrum palmeri (A.Gray) Rydb. accepted as Artemisia palmeri A.Gray (original description)
Balsamita balsamita (L.) Rydb. accepted as Tanacetum balsamita L. (original description)
Chamartemisia Rydb. accepted as Artemisia L. (original description)
Chamartemisia compacta (H.M.Hall) Rydb. accepted as Sphaeromeria compacta (H.M.Hall) A.H.Holmgren, L.M.Shultz & Lowrey (original description)
Chamomilla hookeri (Sch.Bip.) Rydb. accepted as Tripleurospermum maritimum subsp. phaeocephalum (Rupr.) Hämet-Ahti accepted as Tripleurospermum hookeri Sch.Bip. accepted as Tripleurospermum maritimum subsp. phaeocephalum (Rupr.) Hämet-Ahti (original description)
Chamomilla maritima (L.) Rydb. accepted as Tripleurospermum maritimum (L.) W.D.J.Koch (original description)
Chamomilla occidentalis (Greene) Rydb. accepted as Matricaria discoidea subsp. occidentalis (Greene) P.D.Sell (original description)
Chamomilla suffruticosa Rydb. accepted as Oncosiphon suffruticosum (L.) Källersjö (original description)
Crossostephium californicum (Less.) Rydb. accepted as Artemisia californica Less. (original description)
Crossostephium foliosum (Nutt.) Rydb. accepted as Artemisia californica Less. (original description)
Crossostephium insulare Rydb. accepted as Artemisia nesiotica P.H.Raven (original description)
Hydropectis Rydb. (original description)
Hydropectis aquatica (S.Watson) Rydb. (original description)
Lancisia australis (Sieber ex Spreng.) Rydb. accepted as Cotula australis (Sieber ex Spreng.) Hook.f. (original description)
Lancisia coronopifolia (L.) Rydb. accepted as Cotula coronopifolia L. (original description)
Lancisia minuta (L.f.) Rydb. accepted as Cotula mexicana (DC.) Cabrera (original description)
Leucanthemum leucanthemum Rydb. (original description)
Pectis biaristata Rydb. accepted as Pectis stenophylla var. biaristata (Rydb.) D.J.Keil (original description)
Pectis caymanensis (Urb.) Rydb. (original description)
Pectis cylindrica (Fernald) Rydb. (original description)
Pectis juniperina Rydb. (original description)
Pectis lancifolia (Greenm.) Rydb. accepted as Pectis purpurea var. lancifolia (Greenm.) D.J.Keil (original description)
Pectis leonis Rydb. (original description)
Pectis mearnsii Rydb. accepted as Pectis rusbyi Greene ex A.Gray (original description)
Pectis multisetosa Rydb. accepted as Pectis prostrata Cav. (original description)
Pectis oerstediana Rydb. accepted as Pectis elongata var. oerstediana (Rydb.) D.J.Keil (original description)
Pectis polyantha Rydb. accepted as Pectis saturejoides (Mill.) Sch.Bip. (original description)
Pectis urceolata (Fernald) Rydb. accepted as Pectis prostrata Cav. (original description)
Porophyllum cedrense Rose & Standl. ex Rydb. accepted as Porophyllum gracile Benth. (original description)
Porophyllum cedrense Rose & Standl. (original description)
Porophyllum divaricatum Rydb. accepted as Porophyllum punctatum (Mill.) S.F.Blake (original description)
Porophyllum filiforme Rydb. (original description)
Porophyllum fruticulosum Rydb. accepted as Porophyllum scoparium A.Gray (original description)
Porophyllum guatemalense Rydb. accepted as Porophyllum punctatum (Mill.) S.F.Blake (original description)
Porophyllum leiocarpum (Urb.) Rydb. (original description)
Porophyllum oblongum Rydb. accepted as Porophyllum punctatum (Mill.) S.F.Blake (original description)
Porophyllum ochroleucum Rydb. accepted as Porophyllum gracile Benth. (original description)
Porophyllum pinifolium Rydb. accepted as Porophyllum gracile Benth. (original description)
Porophyllum pittieri Rydb. accepted as Porophyllum punctatum (Mill.) S.F.Blake (original description)
Porophyllum porfyreum Rose & Standl. accepted as Porophyllum maritimum Brandegee (original description)
Sphaeromeria diversifolia (D.C.Eaton) Rydb. (original description)
Vesicarpa Rydb. accepted as Sphaeromeria Nutt. (original description)
Vesicarpa potentilloides (A.Gray) Rydb. accepted as Sphaeromeria potentilloides (A.Gray) A.Heller (original description)