|milkweed (Asclepias spp.)||
milkweed (Asclepias spp.; MILKWEED FAMILY [Asclepiadaceae]) More than 10 species of perennial plants of various sizes and habitats, all with milky juice. Flowers from greenish white to purple or red depending on species, but always in umbels, and always with the distinctive form described for butterfly weed. Fruits are relatively large, dry, and split along one line to discharge seeds, which become windborne from conspicuous tufts of soft hair. Leaves opposite or whorled and entire. Wisconsin species include the tall (to 7') common milkweed, Asclepias syriaca of pastures and the showy pink to red flowered swamp milkweed, Asclepias incarnata. Flowering is at discrete times depending on the species. 
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