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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". It is usually considered segregate from the genus Stipa and includes many New World species formerly classified in that genus. As of 2011, The Jepson Manual includes Nassella within Stipa.
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 florets 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.
As of 2001, there were about 116 species in this genus.
- Nassella pulchra — purple needlegrass; currently reclassified as Stipa pulchra.
- A native grass of California that was once a dominant species in California grasslands before invasive European grasses became dominant. The seeds were an important food source for many of the Indigenous peoples of California. Today, the bunchgrass is the State Grass of California and plays an important role in native grassland restoration and erosion control.
- Nassella lepida — foothill needlegrass; currently reclassified as Stipa lepida.
- Nassella cernua — nodding needlegrass; currently reclassified as Stipa cernua.
- A native bunchgrass of California, Northwestern Mexico, and the Western United States.
- Nassella gigantea, currently reclassified as Stipa gigantea — giant feather grass, giant needle grass, Spanish feather grass.
- An attractive, drought-tolerant bunchgrass with a tall and golden inflorescence rising above the foliage. Native to the Iberian Peninsula.
- Nassella tenuissima — Mexican feathergrass.
- An attractive, drought-tolerant bunchgrass with fine leaves and a narrow inflorescence that sways gracefully in the wind. However, it readily escapes from cultivation and takes hold in disturbed areas, natural areas, and in sidewalk cracks, driveways, and tree wells. It is an invasive species in California and Oregon.
- Nassella charruana (Arechav.) Barkworth
- Nassella chilensis - Chilean tussockgrass
- Nassella crassiflora'' (Roseng. & B.R.Arrill.) Barkworth
- Nassella hyalina - spear grass
- Nassella laevissima
- Nassella leucotricha - Texas wintergrass
- Nassella manicata - Andean tussockgrass, tropical needlegrass
- Nassella neesiana - Uruguayan tussockgrass
- Nassella rosengurttii (Chase) Barkworth
- Nassella trichotoma - serrated tussockgrass, Yass River tussockgrass
- Nassella viridula - green needlegrass
- Nassella. The Jepson Manual.
- Barkworth, M. E. Nassella E.Desv. Stipeae Pages. Intermountain Herbarium, Utah State University. June 13, 2003.
- Stipa pulchra. The Jepson Manual.
- 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.
- "History and Culture: State Insignia", California State Library, December 8, 2006.
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