Taxon  Report   8281    
Viola adunca  Sm.
Blue violet,  Dog violet, Hookedspur violet, Western dog violet
Viola adunca
© 2017 Hailey Laskey
Photos from
CalPhotos / Calflora
Viola adunca
© 2005 Christopher L. Christie
Viola adunca
© 2009 Keir Morse
Viola adunca, a dicot, is a perennial herb that is native to California, is also found elsewhere in North America and beyond.

Interactive Distribution Map

Observation Hotline
(observation details)

point, line, or polygon

Plant Characteristics
and Associations

Bloom Period
Viola adunca
© 2018 Zoe mz
Genus: Viola
Subspecies and Varieties:
Communities: Yellow Pine Forest, Red Fir Forest, Lodgepole Forest, Redwood Forest, Mixed Evergreen Forest, Subalpine Forest, Alpine Fell-fields, wetland-riparian

Toxicity: MINOR (SEEDS)

Wetlands: Equally likely to occur in wetlands and non wetlands

Habitat: streambanks, meadows

Name Status:
Accepted by ICPN + PLANTS

More information about  Viola adunca
Nursery / seed vendor availability from CNPLX
This plant is available commercially.
Landscaping information from Calscape
Photos on   /   Google Images
Jepson eFlora

Records from the Consortium of California Herbaria

ITIS Original Publication citation


Search the International Plants Names Index

Search (Flora of North America)

website references from Google

California's Coastal Prairies - Ecology. Sonoma State University:  Viola adunca is the larval host plant of the endangered Myrtle’s silverspot butterfly (Speyeria zerene myrtleae ). ... survival of the butterfly ... is linked to the continued persistence of this violet.

Speyeria zerene myrtleae: XERCES SOCIETY:  Formerly widespread on the San Francisco and Marin peninsulas, ... is now only known from four populations in northwestern Marin County and southwestern Sonoma County.

Speyeria zerene myrtleae: Essig Museum of Entomology:  The eggs are laid only on species of Viola, possibly only Viola adunca.

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]. 2019. Berkeley, California: The Calflora Database [a non-profit organization]. Available:   (Accessed: Jan 20, 2019).