Taxon  Report   1845 
Centaurea calcitrapa  L.
Purple star thistle,  Red star thistle
Centaurea calcitrapa
© 2008 Jennifer Buck
Click on a photo to see it bigger.
Centaurea calcitrapa
© 2009 Barry Rice
Centaurea calcitrapa
© 2008 Neal Kramer
Centaurea calcitrapa, a dicot, is an annual or perennial herb that is not native to California; it was introduced from elsewhere and naturalized in the wild.
It is an invasive plant. The California Invasive Plant Council classifies its potential impact on native ecosystems as moderate (plant profile / CalWeedMapper).

Interactive Distribution Map

Observation Hotline
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point, line, or polygon

one or more occurrences
within a 7.5-minute quadrangle

Plant Characteristics
and Associations

Bloom Period
Centaurea calcitrapa
© 2005 Luigi Rignanese
Genus: Centaurea
weed, characteristic of disturbed places
Habitat: disturbed [Walker]
Distribution by County 

Add an Observation of  Centaurea calcitrapa

Name Status:
Accepted by TJM2 + PLANTS + JM93
More information about  Centaurea calcitrapa
Photos on CalPhotos / Google Images
Photos and ID tips from

Jepson eFlora

Records from the Consortium of California Herbaria

Original Publication citation (ITIS)


Search the International Plants Names Index

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 27, 2016).

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