Xanthium
cocklebur
2 species
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Xanthium spinosumspiny clotbur, spiny cockleburr
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east across most of North America to the Atlantic Coast.
Habitat: Fields, damp or seasonally wet, alkaline soils, wastelots and other disturbed, open areas.
Origin: Introduced from South America (although treated as native in CA by Jeps. Man.)
Flowers: July-October
Growth Duration: annual
Xanthium strumariumCanada cocklebur, common cocklebur
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast
Habitat: Wet meadows, shorelines, and disturbed open areas where moist.
Origin: Native
Flowers: July-October
Growth Duration: annual