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Nassella
''Nassella'' (needlegrass) is a New World genus of over 100 perennial bunchgrasses found from North America through South America. The Latin word ''nassa'' refers to "a basket with a narrow neck".〔(''Nassella''. ) ''The Jepson Manual''.〕 It is usually considered segregate from the genus ''Stipa'' and includes many New World species formerly classified in that genus.〔Barkworth, M. E. (''Nassella'' E.Desv. ) ''Stipeae Pages''. Intermountain Herbarium, Utah State University. June 13, 2003.〕 As of 2011, ''The Jepson Manual'' includes ''Nassella'' within ''Stipa''.〔(''Stipa pulchra''. ) ''The Jepson Manual''.〕
''Nasella'' is characterized by strongly overlapping lemma margins and reduced, veinless paleas. The lemma tips are fused into the "crown," a short membrane that surrounds the base of the lemma. The rim of the crown usually has hairs.
Many species form both cross-pollinating and self-pollinating florets in the terminal panicle. The self-pollinating florets have 1 – 3 small anthers; the cross-pollinating florest have 3 longer anthers. Some species have self-pollinating inflorescences hidden in their basal leaf sheaths. These hidden inflorescences lack glumes and usually lack awns.
==Diversity==
As of 2001, there were about 116 species in this genus.〔Barkworth, M. E. and M. A. Torres. (2001). (Distribution and diagnostic characters of ''Nassella'' (Poaceae: Stipeae). ) ''Taxon'' 50(2) Golden Jubilee Part 4, 439-68.〕
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