Entry 1 sense Webster, 1913 chiggerflower · IPA 01 n. an erect perennial of eastern and southern U. S. (Asclepias tuberosa) having showy orange flowers. 1. an erect perennial of eastern and southern U. S. (Asclepias tuberosa) having showy orange flowers. Syn. butterfly weed, orange milkweed, pleurisy root, tuber root, Indian paintbrush, Asclepias tuberosa.