Source : Webster's Revised Unabridged Dictionary (1913)

Asclepiadaceous \As*cle`pi*a*da"ceous\, a. [See {Asclepias}.]
   (Bot.)
   Of, pertaining to, or resembling, plants of the Milkweed
   family.

Source : WordNet®

asclepiadaceous
     adj : of or relating to plants of the milkweed family