Achnatherum
Achnatherum is a genus of plants which includes several species of needlegrass. Several needlegrass species have been switched between Achnatherum and genus Stipa; taxonomy between the two closely related genera is still uncertain.
Achnatherum hymenoides was useful as a food source to Native Americans. Achnatherum brachychaetum is best known as a noxious weed.
Selected species
Achnatherum acutum (Swallen) Valdés-Reyna & Barkworth
Achnatherum aridum (M.E.Jones) Barkworth - Mormon needlegrass
Achnatherum bloomeri (Boland.) Barkworth - Bloomer's ricegrass
Achnatherum bromoides (L.) P. Beauv.
Achnatherum brachychaetum (Godr.) Barkworth - punagrass
Achnatherum calamagrostis (Stipa calamagrostis) (L.) Beauv. - Spear grass, Needle Grass, Silver Spike Grass
Achnatherum capense (L.) P. Beauv.
Achnatherum caragana (Trin. & Rupr.) Nevski
Achnatherum caudatum (Trin.) S. L. W. Jacobs & J. Everett - Chilean ricegrass
Achnatherum clandestinum (Hack.) Barkworth - Mexican ricegrass
Achnatherum contractum (B.L. Johnson) Barkworth - contracted ricegrass