widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity
source: WordNet 3.0
any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma
source: WordNet 3.0
A common American composite weed (Ambrosia artemisiæfolia) with finely divided leaves; hogweed.
