weedy annual plant of the genus Xanthium of the family Asteraceae, distributed throughout much of Europe and parts of North America. Some authorities ... Found on http://www.britannica.com/eb/a-z/c/103
Coc'kle·bur` noun (Botany) A coarse, composite weed, having a rough or prickly fruit; one of several species of the genus Xanthium ; -- called also clotbur . Found on http://www.encyclo.co.uk/webster/C/102