iron·weed /-ˌwid/
紫苑屬的植物
I·ron·weed n. Bot. A tall weed with purplish flowers (Vernonia Noveboracensis). The name is also applied to other plants of the same genus.
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ironweed
n : any of various plants of the genus Vernonia of tropical and
warm regions of especially North America that take their
name from their loose heads of purple to rose flowers
that quickly take on a rusty hue [syn: vernonia]