Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to New Mexico, also in eastern North America.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas.
Flowers: July-September
Origin: Introduced
Growth Duration: Annual, Biennial, Perennial
Conservation Status: Not of concern
Pollination: Bees, flies, beetles, wasps
[none provided]
PNW Herbaria: Specimen records of Centaurea calcitrapa in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Centaurea calcitrapa checklist entry
OregonFlora: Centaurea calcitrapa information
E-Flora BC: Centaurea calcitrapa atlas page
CalPhotos: Centaurea calcitrapa photos