| mead's milkweed | (n) milkweed of central North America; a threatened species, Syn. Asclepias meadii, Asclepia meadii |
| milkweed | (n) any of numerous plants of the genus Asclepias having milky juice and pods that split open releasing seeds with downy tufts, Syn. silkweed |
| milkweed | (n) annual Eurasian sow thistle with soft spiny leaves and rayed yellow flower heads, Syn. Sonchus oleraceus |
| poison milkweed | (n) milkweed of southwestern United States and Mexico; poisonous to livestock, Syn. horsetail milkweed, Asclepias subverticillata |
| poke milkweed | (n) milkweed of the eastern United States with leaves resembling those of pokeweed, Syn. Asclepias exaltata |
| showy milkweed | (n) milkweed of southern North America having large starry purple and pink flowers, Syn. Asclepias speciosa |
| swamp milkweed | (n) densely branching perennial of the eastern United States with white to crimson or purple flowers, Syn. Asclepias incarnata |
| white milkweed | (n) tall herb with leafless white waxy stems and whitish starlike flowers; southwestern United States, Syn. Asclepias albicans |
| whorled milkweed | (n) milkweed of the eastern United States with narrow leaves in whorls and greenish-white flowers, Syn. Asclepias verticillata |
| asclepiadaceae | (n) widely distributed family of herbs and shrubs of the order Gentianales; most with milky juice, Syn. family Asclepiadaceae, milkweed family |
| butterfly weed | (n) erect perennial of eastern and southern United States having showy orange flowers, Syn. tuber root, Indian paintbrush, Asclepias tuberosa, pleurisy root, chigger flower, chiggerflower, orange milkweed |
| joe-pye weed | (n) North American herb having whorled leaves and terminal clusters of flowers spotted with purple, Syn. purple boneset, trumpet weed, Eupatorium purpureum, marsh milkweed |
| monarch | (n) large migratory American butterfly having deep orange wings with black and white markings; the larvae feed on milkweed, Syn. Danaus plexippus, monarch butterfly, milkweed butterfly |
