Calflora, a 501c3 non-profit
Distribution by County   466    
Arabis lyallii  S. Watson

(not an active name)
Lyall's rock cress, Lyall's rockcress
Arabis lyallii is a perennial herb that is native to California, and also found elsewhere in western North America.
Record Count by County

Alpine: 9 Inyo: 16 Nevada: 4 Sierra: 2
El Dorado: 5 Mariposa: 6 Placer: 3 Siskiyou: 22
Fresno: 8 Modoc: 5 Plumas: 2 Tulare: 4
Humboldt: 2 Mono: 27 Shasta: 3 Tuolumne: 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: 04/22/2026).