Taxon  Report   8281 
Viola adunca  Sm.
Blue violet,  Dog violet, Hookedspur violet, Western dog violet
Viola adunca
© 2009 Keir Morse
More photos from
CalPhotos / Calflora
Viola adunca
© 2008 Neal Kramer
Viola adunca
© 2014 Jean Pawek
Viola adunca, a dicot, is a perennial herb that is native to California and is also found elsewhere in North America and beyond.

Interactive Distribution Map

Observation Hotline
(observation details + photos)

point, line, or polygon

Plant Characteristics
and Associations

Bloom Period
Viola adunca
© 2005 Christopher L. Christie
Genus: Viola
Subspecies and Varieties:
Yellow Pine Forest, Red Fir Forest, Lodgepole Forest, Redwood Forest, Mixed Evergreen Forest, Subalpine Forest, Alpine Fell-fields, wetland-riparian
Habitat: streambanks, meadows
Wetlands: Equally likely to occur in wetlands and non wetlands
Toxicity: MINOR (SEEDS)   [California Poison Control System 2010]    
Name Status:
Accepted by ICPN + PLANTS + JM93
More information about  Viola adunca
Nursery / seed vendor availability from CNPLX
This plant is available commercially.
Landscaping information from Calscape
Photos on CalPhotos / Google Images
Photos on

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.

Jepson eFlora

Records from the Consortium of California Herbaria

ITIS Original Publication citation


Search the International Plants Names Index

Search (Flora of North America)

Search the Lady Bird Johnson Wildflower Center

website references from Google

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]. 2018. Berkeley, California: The Calflora Database [a non-profit organization].
Available:   (Accessed: Jul 22, 2018).

The information on this page comes from diverse sources. None of the links are sponsored.