Calflora, a 501c3 non-profit
Distribution by County   692    
Arnica sororia  Greene
Soro arnica,   Twin arnica
Arnica sororia is a perennial herb (rhizomatous) that is native to California, and also found elsewhere in western North America.
Record Count by County

Alpine: 1 Modoc: 23 Plumas: 1
Inyo: 4 Mono: 12 Siskiyou: 2
Lassen: 36 Nevada: 3 Tulare: 20

Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals, including the Consortium of California Herbaria. [web application]. 2026. The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 01/14/2026).