Page author: David Giblin
Xanthium spinosum
spiny clotbur, spiny cocklebur

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.

Flowers: July-October

Origin: Introduced from South America (although treated as native in CA by Jeps. Man.)

Growth Duration: Annual

Conservation Status: Not of concern

Pollination: Bees, flies, beetles, wasps


[none provided]

Accepted Name:
Xanthium spinosum L.
Publication: Sp. Pl. 2: 987. 1753.

Synonyms & Misapplications:
Xanthium ambrosioides Hook. & Arn.
Xanthium spinosum L. var. inerme Bel
Additional Resources:

PNW Herbaria: Specimen records of Xanthium spinosum in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Xanthium spinosum checklist entry.

OregonFlora: Xanthium spinosum information.

E-Flora BC: Xanthium spinosum atlas page.

CalPhotos: Xanthium spinosum photos.

USDA Plants: Xanthium spinosum information.

11 photographs:
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