Taxon  Report   1504 
Carduus pycnocephalus  L.
Italian thistle

Carduus pycnocephalus
© 2004 Carol W. Witham
Carduus pycnocephalus
© 2001 CDFA
Carduus pycnocephalus, a dicot, is an annual herb that is not native to California; it was introduced from elsewhere and naturalized in the wild.
The California Invasive Plant Council classifies its potential impact on native ecosystems as moderate   (plant profile / CalWeedMapper).

 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
Carduus pycnocephalus
© 2004 Carol W. Witham
Genus: Carduus
Subspecies and Varieties:
weed, characteristic of disturbed places
Habitat: disturbed [Walker]
Distribution by County 

Add an Observation of  Carduus pycnocephalus

Name Status:
Accepted by TJM2 + PLANTS + JM93
 More information about  Carduus pycnocephalus

Photos on CalPhotos / Google Images

website references on Google

Jepson eFlora

Records from the Consortium of California Herbaria

Original Publication citation. on the
International Plants Names Index

Search (Flora of North America)

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]. 2015. Berkeley, California: The Calflora Database [a non-profit organization].
Available:   (Accessed: Nov 24, 2015).

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

News About Calflora Home
Calflora  -  1700 Shattuck Avenue   #198,   Berkeley, CA   94709  -  510 883-3148  -  CONTACT