butterfly weed

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Related to butterfly weeds: Asclepias tuberosa

butterfly weed:

see milkweedmilkweed,
common name for members of the Asclepiadaceae, a family of mostly perennial herbs and shrubs characterized by milky sap, a tuft of silky hairs attached to the seed (for wind distribution), and (usually) a climbing habit.
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References in periodicals archive ?
For example, Monarch caterpillars will only feed on butterfly weeds (also known as milkweed).
As the entire family worked in the yard cutting back last year's growth, we noticed little caterpillars crawling on the Asclepias tuberosa - a k a butterfly weed.