Ironweed definitions

ī'ərn-wēd'
Any of various plants of the genus Vernonia of the composite family, having alternate leaves and clusters of purplish flower heads.
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Any of a genus (Vernonia) of perennial plants of the composite family, with clusters of small, tubular, purple flowers.
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Any of certain species of the genus Vernonia of forbs and shrubs.
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Origin of ironweed

iron +‎ weed