common ragweed

English Thesaurus

1. annual weed with finely divided foliage and spikes of green flowers; common in North America; introduced elsewhere accidentally (noun.plant)

hypernym	:	ambrosia, bitterweed, ragweed,
definition	:	any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma (noun.plant)