ALLERGY AND ASTHMA IN THE SOUTHWESTERN UNITED STATES 
cocklebur image Common Cocklebur -
Xanthium strumarium

Flowering Period in Southern Arizona: August, September.  Large broad leaves, ovoid burs 1/2-1 in long.

Photo from USDA Natural Resources Conservation Service PLANTS website USDA, NRCS, 1995-Midwestern Wetland Flora

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