| Arnica alpina (L.) Olin & Ladau | Arnica angustifolia Vahl subsp. alpina (L.) I. K. Ferguson | | | Arnica alpina(L.) Olin & Ladau | Arnica angustifoliaVahl subsp. alpina (L.) I. K. Ferguson |
| Arnica chamissonis Less. | | a | | Arnica chamissonisLess. | |
| Arnica foliosa Nutt. | Arnica chamissonis Less. | | | Arnica foliosaNutt. | Arnica chamissonisLess. |
| Arnica latifolia Bong. | | a | | Arnica latifoliaBong. | |
| Arnica lessingii (Torr. & A. Gray) Greene subsp. norbergii Hulten & Maguire | Arnica lessingii (Torr. & A. Gray) Greene | | i | Arnica lessingii(Torr. & A. Gray) Greene subsp. norbergii Hulten & Maguire | Arnica lessingii(Torr. & A. Gray) Greene |
| Arnica montana L. | | a | | Arnica montanaL. | |
| Arnica sachalinensis (Regel) A. Gray | | a | | Arnica sachalinensis(Regel) A. Gray | |
| Arnica unalaschcensis Less. | | a | | Arnica unalaschcensisLess. | |
| Arnica angustifolia Vahl subsp. alpina (L.) I. K. Ferguson | | a | i | Arnica angustifoliaVahl subsp. alpina (L.) I. K. Ferguson | |
| Arnica chamissonis Less. subsp. foliosa (Nutt.) Maguire | Arnica chamissonis Less. | | i | Arnica chamissonisLess. subsp. foliosa (Nutt.) Maguire | Arnica chamissonisLess. |
| Arnica spp. | | a | | Arnica spp. | |
| Arnica cordifolia Hook. | | a | | Arnica cordifoliaHook. | |
| Arnica sororia Greene | | a | | Arnica sororiaGreene | |
| Arnica fulgens Pursh | | a | | Arnica fulgensPursh | |
| Arnica frigida C. A. Mey. ex Iljin | Arnica griscomii Fernald subsp. frigida (C. A. Mey. ex Iljin) S. J. Wolf | | | Arnica frigidaC. A. Mey. ex Iljin | Arnica griscomiiFernald subsp. frigida (C. A. Mey. ex Iljin) S. J. Wolf |
| Arnica griscomii Fernald | | a | | Arnica griscomiiFernald | |
| Arnica griscomii Fernald subsp. griscomii | | a | i | Arnica griscomiiFernald subsp. griscomii | |
| Arnica griscomii Fernald subsp. frigida (C. A. Mey. ex Iljin) S. J. Wolf | | a | i | Arnica griscomiiFernald subsp. frigida (C. A. Mey. ex Iljin) S. J. Wolf | |
| Arnica angustifolia Vahl | | a | | Arnica angustifoliaVahl | |
| Arnica tussilaginea Burm. f. | Farfugium japonicum (L.) Kitam. | | | Arnica tussilagineaBurm. f. | Farfugium japonicum(L.) Kitam. |
| Arnica lessingii (Torr. & A. Gray) Greene | | a | | Arnica lessingii(Torr. & A. Gray) Greene | |
| Arnica longifolia D. C. Eaton | | a | | Arnica longifoliaD. C. Eaton | |
| Arnica mollis Hook. | | a | | Arnica mollisHook. | |
| Arnica acaulis (Walter) Britton et al. | | a | | Arnica acaulis(Walter) Britton et al. | |
| Arnica fennoscandica Jurtzev & Korobkov | Arnica angustifolia Vahl subsp. alpina (L.) I. K. Ferguson | | | Arnica fennoscandicaJurtzev & Korobkov | Arnica angustifoliaVahl subsp. alpina (L.) I. K. Ferguson |
| Arnica montana L. var. alpina L. | Arnica angustifolia Vahl subsp. alpina (L.) I. K. Ferguson | | i | Arnica montanaL. var.alpina L. | Arnica angustifoliaVahl subsp. alpina (L.) I. K. Ferguson |
| Arnica angustifolia Vahl subsp. angustifolia | | a | i | Arnica angustifoliaVahl subsp. angustifolia | |
| Arnica angustifolia Vahl subsp. tomentosa (Macoun) G. W. Douglas & Ruyle-Dougl. | | a | i | Arnica angustifoliaVahl subsp. tomentosa (Macoun) G. W. Douglas & Ruyle-Dougl. | |
| Arnica tomentosa Macoun | Arnica angustifolia Vahl subsp. tomentosa (Macoun) G. W. Douglas & Ruyle-Dougl. | | | Arnica tomentosaMacoun | Arnica angustifoliaVahl subsp. tomentosa (Macoun) G. W. Douglas & Ruyle-Dougl. |
| Arnica palmata Thunb. | Syneilesis palmata (Thunb.) Maxim. | | | Arnica palmataThunb. | Syneilesis palmata(Thunb.) Maxim. |
| Arnica angustifolia Vahl subsp. iljinii (Maguire) I. K. Ferguson | | a | i | Arnica angustifoliaVahl subsp. iljinii (Maguire) I. K. Ferguson | |
| Arnica iljinii (Maguire) Iljin | Arnica angustifolia Vahl subsp. iljinii (Maguire) I. K. Ferguson | | | Arnica iljinii(Maguire) Iljin | Arnica angustifoliaVahl subsp. iljinii (Maguire) I. K. Ferguson |
| Arnica alpina (L.) Olin & Ladau subsp. iljinii Maguire | Arnica angustifolia Vahl subsp. iljinii (Maguire) I. K. Ferguson | | i | Arnica alpina(L.) Olin & Ladau subsp. iljinii Maguire | Arnica angustifoliaVahl subsp. iljinii (Maguire) I. K. Ferguson |
| Arnica chamissonis Less. var. sachalinensis Regel | Arnica sachalinensis (Regel) A. Gray | | i | Arnica chamissonisLess. var.sachalinensis Regel | Arnica sachalinensis(Regel) A. Gray |
| Arnica lanceolata Nutt. | | a | | Arnica lanceolataNutt. | |
| Arnica lanceolata Nutt. subsp. lanceolata | | a | i | Arnica lanceolataNutt. subsp. lanceolata | |
| Arnica lanceolata Nutt. subsp. prima (Maguire) Strother & S. J. Wolf | | a | i | Arnica lanceolataNutt. subsp. prima (Maguire) Strother & S. J. Wolf | |
| Arnica amplexifolia Rydb. subsp. prima Maguire | Arnica lanceolata Nutt. subsp. prima (Maguire) Strother & S. J. Wolf | | i | Arnica amplexifoliaRydb. subsp. prima Maguire | Arnica lanceolataNutt. subsp. prima (Maguire) Strother & S. J. Wolf |
| Arnica parryi A. Gray | | a | | Arnica parryiA. Gray | |
| Arnica japonica Thunb. | Ligularia japonica (Thunb.) Less. | | | Arnica japonicaThunb. | Ligularia japonica(Thunb.) Less. |
| Arnica viscosa A. Gray | | a | | Arnica viscosaA. Gray | |
| Arnica ciliata Thunb. | Hypochaeris ciliata (Thunb.) Makino | | | Arnica ciliataThunb. | Hypochaeris ciliata(Thunb.) Makino |
| Arnica lonchophylla Greene | | a | | Arnica lonchophyllaGreene | |