| Noun | 1. | silkweed - any of numerous plants of the genus Asclepias having milky juice and pods that split open releasing seeds with downy tuftsherb, herbaceous plant - a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests Asclepias, genus Asclepias - genus of chiefly North American perennial herbs: silkweed; milkweed Asclepias albicans, white milkweed - tall herb with leafless white waxy stems and whitish starlike flowers; southwestern United States Asclepias curassavica, blood flower, swallowwort - tropical herb having orange-red flowers followed by pods suggesting a swallow with outspread wings; a weed throughout the tropics Asclepias exaltata, poke milkweed - milkweed of the eastern United States with leaves resembling those of pokeweed Asclepias incarnata, swamp milkweed - densely branching perennial of the eastern United States with white to crimson or purple flowers Asclepia meadii, Asclepias meadii, Mead's milkweed - milkweed of central North America; a threatened species Asclepias purpurascens, purple silkweed - perennial of eastern North America having pink-purple flowers Asclepias speciosa, showy milkweed - milkweed of southern North America having large starry purple and pink flowers Asclepias subverticillata, horsetail milkweed, poison milkweed - milkweed of southwestern United States and Mexico; poisonous to livestock Asclepias tuberosa, butterfly weed, chigger flower, chiggerflower, Indian paintbrush, orange milkweed, pleurisy root, tuber root - erect perennial of eastern and southern United States having showy orange flowers Asclepias verticillata, whorled milkweed - milkweed of the eastern United States with narrow leaves in whorls and greenish-white flowers |