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swamp milkweed

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noun
  1. a coarse milkweed, Asclepias incarnata, growing in swampy places from eastern North America to Colorado, having ball-like clusters of rose-purple flowers.
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Origin of swamp milkweed

An Americanism dating back to 1855–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018