UW Burke Herbarium species comparison

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Xanthium spinosum

spiny clotbur, spiny cockleburr

Xanthium spinosum
Flowering time July-October
Habitat Fields, damp or seasonally wet, alkaline soils, wastelots and other disturbed, open areas.
Distribution
Occurring east of the Cascades crest in Washington; British Columbia to California, east across most of North America to the Atlantic Coast.
[WildflowerSearch map]
[BONAP county map]
Origin Introduced from South America (although treated as native in CA by Jeps. Man.)
Conservation status Not of concern
Sibling taxa
X. strumarium
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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