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]