Photographer: PNW Weed Management Handbook
Xanthium spinosum L.
Xanthium: from a Greek word meaning "yellow"
|Status: ||Introduced - adventive|
|Plant: ||erect, annual, 1'-4' tall forb with rough stems|
|Flower: ||head green; inflorescence of 1 to a few heads in leaf axils; blooms July-Oct.|
|Fruit:||thick dry seeds, clustered in a 1/3" cylindrical bur with thin hooked prickles|
|Leaf:||lance-like, tapering to base, silvery beneath, with 1/3" - 3/4" yellow spine in the axils|
|Habitat: ||disturbed sites|