Xanthium spinosum L.
Family: Asteraceae
spiny cocklebur
Xanthium spinosum image
(c)Barry A. Rice/The Nature Conservancy  
Etymology: Xanthium: from a Greek word meaning "yellow"
Plants: erect, annual, 1'-4' tall forb with rough stems
Leaves: lance-like, tapering to base, silvery beneath, with 1/3" - 3/4" yellow spine in the axils
Flowers: head green; inflorescence of 1 to a few heads in leaf axils; blooms July-Oct.
Fruits: thick dry seeds, clustered in a 1/3" cylindrical bur with thin hooked prickles
Habitat: disturbed sites
Conservation Status: Introduced - adventive
Xanthium spinosum image
from USDA Plants website  
Xanthium spinosum image
(c)Barry A. Rice/The Nature Conservancy  
Xanthium spinosum image
from USDA Plants Website  
Xanthium spinosum image
(c)John M. Randall/The Nature Conservancy  
Xanthium spinosum image
Kurt Stüber  
Xanthium spinosum image
PNW Weed Management Handbook  
Xanthium spinosum image
(c)John M. Randall/The Nature Conservancy  
Xanthium spinosum image
Kurt Stüber  
Xanthium spinosum image
Xanthium spinosum image
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