Wiktionary
orange milkweed
n. ''Asclepias tuberosa'', a milkweed native to eastern North America, with clustered orange flowers.
WordNet
orange milkweed
n. erect perennial of eastern and southern United States having showy orange flowers [syn: butterfly weed, chigger flower, chiggerflower, pleurisy root, tuber root, Indian paintbrush, Asclepias tuberosa]