| Family | ASTERACEAE |
| Genus species | Arnica rydbergii Greene trib. Heliantheae |
| Bibliography | Pittonia 4: 36 (1899) |
| Native Range | w. Canada to nw. USA and Utah |
| Primary Biome | Temperate |
| Habitat | grassland |
| Altitude | 1200-3400m |
| Description | basal leaves petiolate, oblanceolate or spathulate, stem leaves 3-4 pairs, sessile, similar, capitula solitary, campanulate, ligules 1-2cm long |
| Size | 10-30cm |
| Color | yellow |
| Bloom | summer |
| Ca | |
| Type | perennial |
| Cultivation | mesic, slightly humous, sunny site alpine house, moist, rich, drained soil, sun |
| Propagation | seed in spring, barely covered, germ. 1 month, 10-16°C division in spring; cuttings in late summer |
| Synonyms | Arnica aurantiaca Greene Arnica caespitosa A.Nelson Arnica cascadensis H.St.John Arnica lasiosperma Greene Arnica sulcata Rydb. Arnica tenuis Rydb. |
| Territory | 7 Northern America 71 Western Canada (ABT Alberta, BRC British Columbia) 73 Northwestern U.S.A. (COL Colorado, IDA Idaho, MNT Montana, ORE Oregon, WAS Washington, WYO Wyoming) 76 Southwestern U.S.A. (UTA Utah) |