Arnica alata Rydb. accepted as Arnica discoidea Benth. (original description)
Arnica amplifolia Rydb. accepted as Arnica mollis Hook. (original description)
Arnica arachnoidea Rydb. accepted as Arnica mollis Hook. (original description)
Arnica austinae Rydb. accepted as Arnica cordifolia Hook. (original description)
Arnica borealis Rydb. accepted as Pentacalia amplexicaulis (Kunth) Cuatrec. (original description)
Arnica brevifolia Rydb. accepted as Arnica griscomii subsp. frigida (C.A.Mey. ex Iljin) S.J.Wolf (original description)
Arnica bruceae Rydb. accepted as Arnica chamissonis Less. (original description)
Arnica chandleri Rydb. accepted as Arnica cernua Howell (original description)
Arnica ciliaris Rydb. (original description)
Arnica cusickii Rydb. accepted as Arnica spathulata Greene (original description)
Arnica eastwoodiae Rydb. accepted as Arnica spathulata Greene (original description)
Arnica elongata Rydb. accepted as Pentacalia amplexicaulis (Kunth) Cuatrec. (original description)
Arnica fernaldii Rydb. accepted as Arnica lonchophylla Greene (original description)
Arnica filipes Greene ex Rydb. accepted as Pentacalia amplexicaulis (Kunth) Cuatrec. (original description)
Arnica flodmanii Rydb. accepted as Arnica latifolia Bong. (original description)
Arnica glabrata Rydb. accepted as Arnica latifolia Bong. (original description)
Arnica hirticaulis Rydb. accepted as Pentacalia amplexicaulis (Kunth) Cuatrec. (original description)
Arnica humilis Rydb. accepted as Arnica cordifolia Hook. (original description)
Arnica illiamnae Rydb. accepted as Arnica griscomii subsp. frigida (C.A.Mey. ex Iljin) S.J.Wolf (original description)
Arnica intermedia Howell ex Rydb. accepted as Arnica latifolia Bong. (original description)
Arnica kodiakensis Rydb. accepted as Arnica chamissonis Less. (original description)
Arnica leptocaulis Rydb. accepted as Arnica latifolia Bong. (original description)
Arnica membranacea Rydb. accepted as Arnica latifolia Bong. (original description)
Arnica mendenhallii Rydb. accepted as Arnica griscomii subsp. frigida (C.A.Mey. ex Iljin) S.J.Wolf (original description)
Arnica nutans Rydb. accepted as Arnica griscomii subsp. frigida (C.A.Mey. ex Iljin) S.J.Wolf (original description)
Arnica oligolepis Rydb. accepted as Arnica latifolia Bong. (original description)
Arnica ovalis Rydb. (original description)
Arnica paucibracteata Rydb. accepted as Arnica latifolia Bong. (original description)
Arnica petiolaris (Fernald) Rydb. accepted as Arnica lanceolata Nutt. (original description)
Arnica sancti-laurentii Rydb. accepted as Arnica griscomii subsp. frigida (C.A.Mey. ex Iljin) S.J.Wolf (original description)
Arnica sanhedrensis Rydb. accepted as Arnica discoidea Benth. (original description)
Arnica sulcata Rydb. accepted as Arnica rydbergii Greene (original description)
Arnica trinervata Rydb. accepted as Arnica fulgens Pursh (original description)
Arnica wilsonii Rydb. accepted as Arnica stricta subsp. alpina (L.) I.K.Ferguson (original description)
Cacaliopsis glabrata (Piper) Rydb. accepted as Cacaliopsis nardosmia (A.Gray) A.Gray (original description)
Liabellum Rydb. (original description)
Liabellum angustissimum (A.Gray) Rydb. accepted as Sinclairia angustissima (A.Gray) B.L.Turner (original description)
Liabellum cervinum (B.L.Rob.) Rydb. accepted as Sinclairia cervina (B.L.Rob.) B.L.Turner (original description)
Liabellum palmeri (A.Gray) Rydb. accepted as Sinclairia palmeri (A.Gray) B.L.Turner (original description)
Liabum domingense Rydb. accepted as Liabum subacaule Rydb. (original description)
Liabum subacaule Rydb. (original description)
Luina californica (A.Gray) Rydb. (original description)
Megaliabum Rydb. accepted as Sinclairia Hook. & Arn. (original description)
Megaliabum andrieuxii (DC.) Rydb. accepted as Sinclairia andrieuxii (DC.) H.Rob. & Brettell (original description)
Megaliabum pringlei (B.L.Rob. & Greenm.) Rydb. accepted as Sinclairia pringlei (B.L.Rob. & Greenm.) H.Rob. & Brettell (original description)
Neurolaena intermedia Rydb. (original description)
Neurolaeneae Rydb. (original description)
Petasites alaskanus Rydb. accepted as Petasites frigidus var. frigidus (L.) Fr. (original description)
Petasites hookerianus (Nutt.) Rydb. accepted as Petasites frigidus var. palmatus (Aiton) Cronquist (original description)
Petasites hyperboreus Rydb. accepted as Petasites frigidus var. frigidus (L.) Fr. (original description)
Psathyrotopsis Rydb. (original description)
Psathyrotopsis purpusii (Brandegee) Rydb. (original description)
Pseudobartlettia Rydb. accepted as Psathyrotes (Nutt.) A.Gray (original description)
Pseudobartlettia scaposa (A.Gray) Rydb. accepted as Psathyrotopsis scaposa (A.Gray) H.Rob. (original description)
Raillardella minima Rydb. accepted as Raillardella argentea (A.Gray) A.Gray (original description)
Raillardiopsis Rydb. accepted as Anisocarpus Nutt. (original description)
Raillardiopsis muirii (A.Gray) Rydb. accepted as Carlquistia muirii (A.Gray) B.G.Baldwin (original description)
Raillardiopsis scabrida (Eastw.) Rydb. accepted as Anisocarpus scabridus (Eastw.) B.G.Baldwin (original description)
Schistocarpha kellermanii Rydb. (original description)
Schistocarpha longiligula Rydb. (original description)
Schistocarpha oppositifolia (Kuntze) Rydb. accepted as Schistocarpha eupatorioides (Fenzl) Kuntze (original description)
Schistocarpha seleri Rydb. accepted as Schistocarpha longiligula var. seleri (Rydb.) B.L.Turner (original description)
Schistocarpha velutina Rydb. accepted as Schistocarpha bicolor Less. (original description)
Sinclairia adenotricha (Greenm.) Rydb. (original description)
Sinclairia brachypus Rydb. accepted as Sinclairia sublobata (B.L.Rob.) Rydb. (original description)
Sinclairia caducifolia (B.L.Rob. & Bartlett) Rydb. (original description)
Sinclairia deamii (B.L.Rob. & Bartlett) Rydb. (original description)
Sinclairia deppeana (Less.) Rydb. (original description)
Sinclairia glabra (Hemsl.) Rydb. (original description)
Sinclairia hypochlora (S.F.Blake) Rydb. (original description)
Sinclairia hypoleuca (Greenm.) Rydb. accepted as Sinclairia glabra (Hemsl.) Rydb. (original description)
Sinclairia pittieri Rydb. accepted as Sinclairia polyantha (Klatt) Rydb. (original description)
Sinclairia platylepis (Sch.Bip. ex Sch.Bip.) Rydb. (original description)
Sinclairia polyantha (Klatt) Rydb. (original description)
Sinclairia sericolepis (Hemsl.) Rydb. (original description)
Sinclairia subglandularis (S.F.Blake) Rydb. accepted as Sinclairia deamii (B.L.Rob. & Bartlett) Rydb. (original description)
Sinclairia sublobata (B.L.Rob.) Rydb. (original description)
Sinclairia tonduzii (B.L.Rob.) Rydb. accepted as Sinclairia polyantha (Klatt) Rydb. (original description)
Sinclairiopsis Rydb. (original description)
Sinclairiopsis klattii (B.L.Rob. & Greenm.) Rydb. accepted as Sinclairia klattii (B.L.Rob. & Greenm.) H.Rob. & Brettell (original description)