Common cocklebur xanthium strumarium
Common cocklebur xanthium strumarium

origin: Eurasia, Central America/vacant lot, banks of Newtown Creek
seed: jellybean-sized, football shaped prickly burs, green drying to brown
description: Course summer annual. Thick stems can have purple-ish spots on mature plant. Naturalized throughout the United States, southern Canada, and Mexico. Seeds can be fatal to livestock if consumed in large quantities. Yellow sap was once used as hair dye.