The Collaborative International Dictionary of English v.0.48:

Asclepiad \As*cle"pi*ad\, n. (Gr. & L. Pros.)
   A choriambic verse, first used by the Greek poet Asclepias,
   consisting of four feet, viz., a spondee, two choriambi, and
   an iambus.
   [1913 Webster]

WordNet (r) 3.0 (2006):

asclepiad
    n 1: any plant of the family Asclepiadaceae