Cocklebur - Xanthium strumarium

Sunflower Family: Compositae
Duration: Annual
U.S. Nativity: Native
Leaves: Broadly Triangular

Sources

Niehaus. Southwestern and Texas wildflowers.
USDA - https://plants.usda.gov/cgi_bin/topics.cgi?earl=plant_profile.cgi&symbol=XAST&photoID=xast_002_ahp.tif"
Photos: S. P. Johnson