From The Collaborative International Dictionary of English v.0.48 :
Eragrostis \Eragrostis\ n.
a genus of annual or perennial grasses of tropics and
subtropics.
Syn: genus Eragrostis.
[WordNet 1.5]
From WordNet (r) 3.0 (2006) :
Eragrostis
n 1: annual or perennial grasses of tropics and subtropics [syn:
Eragrostis, genus Eragrostis]