The Collaborative International Dictionary of English v.0.48:

Erianthus \Erianthus\ n.
   a genus of reedlike grasses having spikes crowded in a
   panicle covered with long silky hairs.

   Syn: genus Erianthus.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Erianthus
    n 1: genus of reedlike grasses having spikes crowded in a
         panicle covered with long silky hairs [syn: Erianthus,
         genus Erianthus]