Calflora, a 501c3 non-profit
Distribution by County   8408    
Viola adunca  Sm.  var. adunca 

(not an active name)
Hookedspur violet,   Western bog violet
Viola adunca var. adunca is a perennial herb that is native to California.
also called Viola adunca ssp. adunca
Record Count by County

Alameda: 3 Humboldt: 7 Modoc: 5 Shasta: 9
Alpine: 1 Inyo: 1 Nevada: 2 Sierra: 1
Butte: 8 Kern: 1 Placer: 2 Siskiyou: 16
Contra Costa: 1 Lake: 2 Plumas: 10 Sonoma: 9
Del Norte: 1 Lassen: 2 San Bernardino: 2 Tehama: 5
El Dorado: 7 Marin: 17 San Diego: 2 Trinity: 7
Fresno: 5 Mariposa: 4 San Francisco: 2 Tulare: 8
Glenn: 3 Mendocino: 15 San Mateo: 17 Tuolumne: 4

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: 01/20/2026).