RagweedWordNet Explorer

any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma

any plant that crowds out cultivated plants

comprising the ragweeds; in some classification considered the type genus of a separate family Ambrosiaceae

annual weed with finely divided foliage and spikes of green flowers; common in North America; introduced elsewhere accidentally

a coarse annual with some leaves deeply and palmately three-cleft or five-cleft

coarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and Mexico

widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity

enormous and diverse cosmopolitan genus of trees and shrubs and vines and herbs including many weeds