Arnica alpina subsp. angustifolia (Vahl) Maguire accepted as Arnica angustifolia subsp. angustifolia Vahl (original description)
Arnica alpina subsp. attenuata (Greene) Maguire accepted as Arnica angustifolia subsp. angustifolia Vahl (original description)
Arnica alpina subsp. tomentosa (J.M.Macoun) Maguire accepted as Arnica angustifolia subsp. tomentosa (J.M.Macoun) G.W.Douglas & Ruyle-Dougl. (original description)
Arnica amplexifolia subsp. genuina Maguire accepted as Pentacalia amplexicaulis (Kunth) Cuatrec. (original description)
Arnica amplexifolia subsp. prima Maguire accepted as Arnica lanceolata subsp. prima (Maguire) Strother & S.J.Wolf (original description)
Arnica amplexifolia var. borealis (Rydb.) Maguire accepted as Pentacalia amplexicaulis (Kunth) Cuatrec. (original description)
Arnica chamissonis subsp. genuina Maguire accepted as Arnica chamissonis Less. (original description)
Arnica cordifolia subsp. genuina Maguire accepted as Arnica cordifolia Hook. (original description)
Arnica lessingii subsp. genuina Maguire accepted as Arnica lessingii (Torr. & A.Gray) Greene (original description)
Arnica lessingii subsp. norbergii Hultén & Maguire accepted as Arnica lessingii (Torr. & A.Gray) Greene (original description)
Arnica louiseana subsp. frigida (C.A.Mey. ex Iljin) Maguire accepted as Arnica griscomii subsp. frigida (C.A.Mey. ex Iljin) S.J.Wolf (original description)
Arnica louiseana var. genuina Maguire (original description)
Arnica louiseana var. illiamnae (Rydb.) Maguire accepted as Arnica griscomii subsp. frigida (C.A.Mey. ex Iljin) S.J.Wolf (original description)
Brickellia oblongifolia subsp. linifolia (D.C.Eaton) Cronquist accepted as Brickellia linifolia var. linifolia (D.C.Eaton) B.L.Rob. (original description)
Brickellia oblongifolia subsp. typica Cronquist accepted as Brickellia oblongifolia Nutt. (original description)