The Collaborative International Dictionary of English v.0.48:
Asclepiadaceous \As*cle`pi*a*da"ceous\, a. [See Asclepias.] (Bot.) Of, pertaining to, or resembling, plants of the Milkweed family. [1913 Webster]WordNet (r) 3.0 (2006):
asclepiadaceous adj 1: of or relating to plants of the milkweed family