Xanthium spinosum L.
Family: Asteraceae
spiny cocklebur
Xanthium spinosum image
from USDA Plants website  
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
(c)Barry A. Rice/The Nature Conservancy  
Xanthium spinosum image
(c)Barry A. Rice/The Nature Conservancy  
Xanthium spinosum image
PNW Weed Management Handbook  
Xanthium spinosum image
Kurt Stüber  
Xanthium spinosum image
Kurt Stüber  
Xanthium spinosum image
from USDA Plants Website  
Xanthium spinosum image
(c)John M. Randall/The Nature Conservancy  
Xanthium spinosum image
(c)John M. Randall/The Nature Conservancy  
Xanthium spinosum image
Xanthium spinosum image