| Asteraceae | |
Arnica amplexicaulis subsp. amplexicaulis
| | | |
| Asteraceae | |
Arnica amplexicaulis var. amplexicaulis
| | | |
| Asteraceae | ** |
Arnica amplexicaulis subsp. genuina
| Maguire | Brittonia 4(3): 472 | 1943 |
| Asteraceae | |
Arnica amplexicaulis var. piperi
| H. St. John & F.A. Warren | Proc. Biol. Soc. Washington 44(10): 36 | 1931 |
| Asteraceae | |
Arnica amplexicaulis subsp. prima
| (Maguire) Maguire | Brittonia 4(3): 472 | 1943 |
| Asteraceae | |
Arnica amplexicaulis var. prima
| (Maguire) B. Boivin | Naturaliste Canad. 94(5): 632 | 1967 |
| Asteraceae | ** |
Arnica amplexicaulis var. prima
| (Maguire) S.L. Welsh | Great Basin Naturalist 28(3): 149 | 1968 |