2 species
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Xanthium spinosumspiny clotbur, spiny cockleburr
Origin: Introduced from South America (although treated as native in CA by Jeps. Man.)
Flowers: July - October
Xanthium strumariumCanada cocklebur, common cocklebur
Distribution: Occurring chiefly east of the Cascades crest in Washington; widely distributed throughout most of North America.
Habitat: Fields, waste places, flood lanes and lake beaches.
Origin: Native
Flowers: April-October