Achillea alpicola (Rydb.) Rydb. accepted as Achillea millefolium L. (original description)
Artemisia pabularis (A.Nelson) Rydb. accepted as Artemisia ludoviciana subsp. ludoviciana Nutt. (original description)
Artemisia scouleriana (Besser) Rydb. accepted as Artemisia campestris var. pacifica (Nutt.) M.Peck (original description)
Artemisia viscidula (Osterh.) Rydb. accepted as Artemisia cana subsp. viscidula (Osterh.) Beetle (original description)
Aster polycephalus Rydb. accepted as Symphyotrichum ericoides var. ericoides (L.) G.L.Nesom (original description)
Berthelotia sericea (Nutt.) Rydb. accepted as Pluchea sericea (Nutt.) Coville (original description)
Carduus filipendulus (A.Gray) Rydb. accepted as Cirsium engelmannii Rydb. (original description)
Chamaechaenactis Rydb. (original description)
Chamaechaenactis scaposa (Eastw.) Rydb. (original description)
Chrysothamnus latifolius (D.C.Eaton) Rydb. accepted as Chrysothamnus viscidiflorus subsp. viscidiflorus (Hook.) Nutt. (original description)
Chrysothamnus serrulatus (Torr.) Rydb. (original description)
Erigeron wootonii Rydb. accepted as Lachnophyllum noeanum Boiss. (original description)
Eschenbachia coulteri (A.Gray) Rydb. accepted as Laennecia coulteri (A.Gray) G.L.Nesom (original description)
Hymenoxys macrantha (A.Nelson) Rydb. (original description)
Hymenoxys multiflora (Buckley) Rydb. (original description)
Hymenoxys multiflora var. osterhoutii Rydb. (original description)
Hymenoxys pumila (Greene) Rydb. (original description)
Leucelene hirtella (A.Gray) Rydb. accepted as Chaetopappa ericoides (Torr.) G.L.Nesom (original description)
Leucelene serotina (Greene) Rydb. (original description)
Oreochrysum Rydb. (original description)
Oreochrysum parryi (A.Gray) Rydb. (original description)
Platyschkuhria (A.Gray) Rydb. (original description)
Platyschkuhria integrifolia (A.Gray) Rydb. (original description)
Platyschkuhria oblongifolia (A.Gray) Rydb. accepted as Platyschkuhria integrifolia (A.Gray) Rydb. (original description)
Prenanthella Rydb. (original description)
Prenanthella exigua (A.Gray) Rydb. (original description)
Rydbergia brandegeei (Porter ex A.Gray) Rydb. accepted as Hymenoxys brandegeei (Porter ex A.Gray) Porter ex K.F.Parker (original description)
Senecio flintii Rydb. (original description)
Senecio harbourii Rydb. accepted as Packera cana (Hook.) W.A.Weber & Á.Löve (original description)
Senecio multicapitatus Greenm. ex Rydb. accepted as Senecio spartioides Torr. & A.Gray (original description)
Senecio oodes Rydb. accepted as Packera streptanthifolia (Greene) W.A.Weber & Á.Löve (original description)
Senecio tracyi Rydb. accepted as Packera crocata (Rydb.) W.A.Weber & Á.Löve (original description)
Senecio turbinatus Rydb. (original description)
Solidago gilvocanescens (Rydb.) Rydb. accepted as Solidago altissima subsp. gilvocanescens (Rydb.) Semple (original description)
Solidago pallida (Porter) Rydb. (original description)
Solidago scabriuscula (Porter) Rydb. (original description)
Tetraneuris glabriuscula Rydb. (original description)
Vernonia arctata Gleason accepted as Lepidaploa arbuscula (Less.) H.Rob. (original description)
Vernonia insularis Gleason accepted as Vernonia blodgettii Small (original description)
Vernonia obcordata Gleason accepted as Lepidaploa arbuscula (Less.) H.Rob. (original description)
Ximenesia exauriculata (B.L.Rob. & Greenm.) Rydb. accepted as Verbesina encelioides subsp. exauriculata (B.L.Rob. & Greenm.) J.R.Coleman (original description)