- Arnica acaulis
- Arnica acaulis (Walter) Britton, Sterns & Poggenb.
- Arnica alpina
- Arnica angustifolia
- Arnica angustifolia Vahl.
- Arnica angustifolia Vahl
- Arnica chamissonis
- Arnica chamissonis Less.
- Arnica chamissonis Less. subsp. foliosa (Nutt.) Maguire
- Arnica chamissonys
- Arnica chamossonis
- Arnica chamossonis Less.
- Arnica cordifolia
- Arnica cordifolia Hook.
- Arnica foliosa
- Arnica foliosa Nutt.
- Arnica fulgens
- Arnica fulgens Pursh
- Arnica griscomii
- Arnica griscomii Fernald subsp. frigida (C. A. Mey. ex Iljin) S. J. Wolf
- Arnica lanceolata
- Arnica lanceolata Nutt. subsp. prima (Maguire) Strother & S.J.Wolf
- Arnica lanceolata Nutt. subsp. prima (Maguire) Strother & S. J. Wolf
- Arnica latifolia
- Arnica latifolia Bong.
- Arnica lessingii
- Arnica lessingii (Torr. & A. Gray) Greene
- Arnica lessingii (Torr. & A.Gray) Greene subsp. lessengii
- Arnica longifolia
- Arnica longifolia D.C.Eaton
- Arnica longifolia D. C. Eaton
- Arnica mollis
- Arnica mollis L.
- Arnica mollis Hook.
- Arnica montana
- Arnica montana L.
- Arnica montana L. subsp. atlantica A.Bolòs
- Arnica nevadensis
- Arnica nevadensis A.Gray
- Arnica parry
- Arnica parry A.Gray
- Arnica parryi
- Arnica parryi A. Gray
- Arnica sachalinensis
- Arnica sororia
- Arnica sororia Greene
- Arnica sp.
- Arnica unalaschcensis
- Arnica unalaschcensis Less.
- Arnica viscosa
- Arnica viscosa A. Gray