A coarse, composite weed, having a rough or prickly fruit; one of several species of the genus Xanthium; -- called also clotbur.

any coarse weed of the genus Xanthium having spiny burrs

burdock having heart-shaped leaves found in open woodland, hedgerows and rough grassland of Europe (except extreme N) and Asia Minor; sometimes cultivated for medicinal and culinary use

a flowering plant that is

The Cockleburs (Xanthium) are a genus of flowering plants in the family Asteraceae, native to the Americas and eastern Asia.