milkweed

Short definition from Wiktionary

Noun

1. 1
   Any of several plants that have a milky sap and have pods that split to release seeds with silky tufts: Principally of the genus Asclepias in order Gentianales, family Apocynaceae
2. 2
   Any of several plants that have a milky sap and have pods that split to release seeds with silky tufts: Also of the genus Calotropis in order Gentianales, family Apocynaceae
3. 3
   Any of several plants that have a milky sap and have pods that split to release seeds with silky tufts: Euphorbia peplus and Euphorbia heterophylla, in order Malpighiales.
4. 4
   A monarch butterfly (Danaus spp).