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Achnatherum parishii.jpg
Achnatherum parishii
Scientific classification e
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Clade: Commelinids
Order: Poales
Family: Poaceae
Subfamily: Pooideae
Supertribe: Stipodae
Tribe: Stipeae
Genus: Achnatherum
P. Beauv.

about 100-300 species, see text

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.


Species recognized by Plants of the World Online as of November 2019:

  • Achnatherum brandisii (Mez) Z.L.Wu
  • Achnatherum bromoides (L.) P.Beauv.
  • Achnatherum calamagrostis (L.) P.Beauv.
  • Achnatherum confusum (Litv.) Tzvelev
  • Achnatherum inebrians (Hance) Keng
  • Achnatherum jacquemontii (Jaub. & Spach) P.C.Kuo & S.L.Lu
  • Achnatherum miliaceum (L.) P.Beauv.
  • Achnatherum paradoxum (L.) Banfi, Galasso & Bartolucci
  • Achnatherum pekinense (Hance) Ohwi
  • Achnatherum pilosum Z.S.Zhang & W.L.Chen
  • Achnatherum pubicalyx (Ohwi) Keng f. ex P.C.Kuo
  • Achnatherum sibiricum (L.) Keng ex Tzvelev
  • Achnatherum turcomanicum (Roshev.) Tzvelev
  • Achnatherum virescens (Trin.) Banfi, Galasso & Bartolucci

Species previously included in Achnatherum:

  • 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 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
  • Achnatherum coronatum (Thurb.) Barkworth - crested needlegrass
  • Achnatherum curvifolium (Swallen) Barkworth - Guadalupe ricegrass
  • Achnatherum diegoense (Swallen) Barkworth - San Diego needlegrass
  • Achnatherum duthiei (Hook.f.) P.C. Kuo & S.L. Lu
  • Achnatherum editorum (E. Fourn.) Valdés-Reyna & Barkworth
  • Achnatherum eminens (Cav.) Barkworth - southwestern needlegrass
  • Achnatherum hendersonii (Vasey) Barkworth - Henderson's needlegrass
  • Achnatherum hymenoides (Oryzopsis hymenoides) Ricker ex Piper - Indian ricegrass
  • Achnatherum latiglume (Swallen) Barkworth - wide-glumed needlegrass
  • Achnatherum lemmonii (Vasey) Barkworth - Lemmon's needlegrass
  • Achnatherum lettermanii (Vasey) Barkworth - Letterman's needlegrass
  • Achnatherum lobatum (Swallen) Barkworth - lobed needlegrass
  • Achnatherum nelsonii (Scribn.) Barkworth - Nelson's needlegrass, Dore's needlegrass
  • Achnatherum nevadense (B.L. Johnson) Barkworth - Nevada needlegrass
  • Achnatherum occidentale (Thurb.) Barkworth - western needlegrass
  • Achnatherum parishii (Vasey) Barkworth - Parish's needlegrass
  • Achnatherum perplexum Hoge & Barkworth - perplexing needlegrass
  • Achnatherum pinetorum (M.E. Jones) Barkworth - pinewoods needlegrass
  • Achnatherum richardsonii (Link) Barkworth - Richardson's needlegrass
  • Achnatherum robustum (Vasey) Barkworth - sleepygrass
  • Achnatherum roshevitzii Mussajev - Roshevich's achnatherum
  • Achnatherum scribneri (Vasey) Barkworth - Scribner needlegrass
  • Achnatherum speciosum Trin. & Rupr. - desert needlegrass
  • Achnatherum splendens (Trin.) Nevski
  • Achnatherum stillmanii (Bol.) Barkworth - Stillman's needlegrass
  • Achnatherum thurberianum (Piper) Barkworth - Thurber's needlegrass
  • Achnatherum swallenii (C.L. Hitchc. & Spellenb.) Barkworth - Swallen's needlegrass
  • Achnatherum webberi (Thurb.) Barkworth - Webber needlegrass
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