Xanthium spinosum

 

Xanthium spinosum ( ) ( )

Asteraceae

  • Stems erect or ascending, branching, 2-10 dm. tall, puberulent; leaves lanceolate, 4-8 cm. long, with a pair of long, narrow lobes on lower half of blade, sometimes with a few small lobes above middle, green above, densely white-pubescent on lower surface, shortly petioled, each with a pair of long, yellow, 3- or 4-parted, stipular spines at base; fruiting bur weakly spiny, tomentose, about 1 cm. long, the beaks inconspicuous. Abundant in waste fields, sometimes along dikes and edges of marshy areas; introduced European weed occasional throughout the United States. "A Flora of the Marshes of California. Herbert L. Mason".

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