Source : Webster's Revised Unabridged Dictionary (1913)

Amentaceous \Am`en*ta"ceous\, a. [LL. amentaceus.] (Bot.)
   (a) Resembling, or consisting of, an ament or aments; as, the
       chestnut has an amentaceous inflorescence.
   (b) Bearing aments; having flowers arranged in aments; as,
       amentaceous plants.

Source : WordNet®

amentaceous
     adj : (of plants) bearing or characterized by aments or catkins
           [syn: {amentiferous}]