n. A general name for plants of the genus Asclepias, somewhat especially for A. Cornuti, the most common American species: so called from their milky juice.n. A plant of the genus Euphorbia, especially E. corollata, the flowering or blooming spurge. See Euphorbia.n. In Great Britain: The sow-thistle, Sonchus oleraceus.n. The milk-parsley, Peucedanum palustre.n. The tall blue lettuce, Lactuca spicata.