Ragweed

['rægwiːd] or ['ræɡwid]

Definition

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

Checked by Ernest--From WordNet

Definition

(n.) A common American composite weed (Ambrosia artemisiaefolia) with finely divided leaves; hogweed.

Checked by Abram