ironweed

[ahy-ern-weed]
noun
any of certain North American composite plants of the genus Vernonia, having tubular, chiefly purple or red disk flowers.

Origin:
1810–20; iron + weed1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
ironweed

noun
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 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Dittany and yellow ironweed are reliable producers, but frost flowers grow on other plants, too.
Yellow ironweed and white crownbeard mature late in the year and often produce frost flowers when conditions are right.
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