The Collaborative International Dictionary of English v.0.48:

Crape \Crape\ (kr[=a]p), n. [F. cr[^e]pe, fr. L. crispus curled,
   crisped. See Crisp.]
   A thin, crimped stuff, made of raw silk gummed and twisted on
   the mill. Black crape is much used for mourning garments,
   also for the dress of some clergymen.
   [1913 Webster]

         A saint in crape is twice a saint in lawn. --Pope.
   [1913 Webster]

   Crape myrtle (Bot.), a very ornamental shrub
      (Lagerstroemia Indica) from the East Indies, often
      planted in the Southern United States. Its foliage is like
      that of the myrtle, and the flower has wavy crisped
      petals.

   Oriental crape. See Canton crape.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

crape myrtle \crape myrtle\ n.
   an tall East Indian and Chinese shrub (Lagerstroemia indica
   of the loosestrife family, commonly planted in Southern and
   Western U. S. as an ornamental shrub. It has clusters of red,
   white, purple, or pink flowers.

   Syn: crepe myrtle, crepe flower, Lagerstroemia indica.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Lagerstroemia indica
    n 1: ornamental shrub from eastern India commonly planted in the
         southern United States [syn: crape myrtle, crepe
         myrtle, crepe flower, Lagerstroemia indica]