ironweed

Noun

i=ron=weed

WORDNET DICTIONARY

ironweed(n = noun.plant) vernonia - 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;

is a member of genus vernonia

is a kind of herb, herbaceous plant

ironweed, n.

A tall weed with purplish flowers (Vernonia Noveboracensis). The name is also applied to other plants of the same genus. [1913 Webster]