Taxon  Report   10384 
Sonchus asper  (L.) Hill
Spiny sowthistle
Sonchus asper
© 2004 Robert E. Preston, Ph.D.
Click on a photo to see it bigger.
Sonchus asper
© 2005 Steve Matson
Sonchus asper
© 2009 Zoya Akulova
Sonchus asper, a dicot, is an annual herb that is not native to California; it was introduced from elsewhere and naturalized in the wild.

Interactive Distribution Map

Observation Hotline
(observation details + photos)

point, line, or polygon

one or more occurrences
within a 7.5-minute quadrangle

Plant Characteristics
and Associations

Bloom Period
Sonchus asper
© 2006 Louis-M. Landry
Genus: Sonchus
Subspecies and Varieties:
weed, characteristic of disturbed places, wetland-riparian
Habitat: disturbed [Walker]
Wetlands:Equally likely to occur in wetlands or non wetlands [U.S. Fish & Wildlife Service.]
Name Status:
Accepted by TJM2 + PLANTS + JM93
Alternate Names:
(according to)

PLANTS: Sonchus asper ssp. glaucescens
PLANTS: Sonchus nymanii
More information about  Sonchus asper
Photos on CalPhotos / Google Images
Photos and ID tips from

UC Integrated Pest Management Weed Photo Gallery
(profile of this plant as an agricultural weed)

Jepson eFlora

Records from the Consortium of California Herbaria


Search (Flora of North America)

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]. 2016. Berkeley, California: The Calflora Database [a non-profit organization].
Available:   (Accessed: Oct 24, 2016).

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