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Achnatherum
	Achnatherum parishii
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Monocots
Clade:	Commelinids
Order:	Poales
Family:	Poaceae
Subfamily:	Pooideae
Supertribe:	Stipodae
Tribe:	Stipeae
Genus:	Achnatherum; P. Beauv.
Species
	about 20 species, see text
Synonyms
	Aristella Bertol.; Lasiagrostis Link, nom. superfl.;

Achnatherum is a genus of flowering plants in the grass family, Poaceae. It includes 20 species of needlegrass native to temperate Eurasia and North Africa.^[1]^[2] Several needlegrass species have been switched between Achnatherum and genus Stipa; taxonomy between the two closely related genera is still uncertain. In 2019 Peterson et al. reorganized the genera in tribe Stipeae based on molecular DNA studies, and placed the species from the Americas into other genera.^[3]

Species

20 species are accepted by Plants of the World Online as of October 2024:^[1]

Achnatherum brandisii (Mez) Z.L.Wu
Achnatherum bromoides (L.) P.Beauv.
Achnatherum calamagrostis (L.) P.Beauv.
Achnatherum confusum (Litv.) Tzvelev
Achnatherum daqinggouense L.Q.Zhao & Yi-ru-gui
Achnatherum haussknechtii (Boiss.) M.Nobis
Achnatherum inebrians (Hance) Keng
Achnatherum jacquemontii (Jaub. & Spach) P.C.Kuo & S.L.Lu
Achnatherum mandavillei (Freitag) M.Nobis
Achnatherum nakaii (Honda) Tateoka
Achnatherum paradoxum (L.) Banfi, Galasso & Bartolucci
Achnatherum parviflorum (Desf.) M.Nobis
Achnatherum pekinense (Hance) Ohwi
Achnatherum pelliotii (Danguy) Röser & Hamasha
Achnatherum pilosum Z.S.Zhang & W.L.Chen
Achnatherum pubicalyx (Ohwi) Keng f. ex P.C.Kuo
Achnatherum sibiricum (L.) Keng ex Tzvelev
Achnatherum staintonii (Bor) M.Nobis & P.D.Gudkova
Achnatherum turcomanicum (Roshev.) Tzvelev
Achnatherum virescens (Trin.) Banfi, Galasso & Bartolucci

Unplaced species

Achnatherum roshevitzii Mussajev (unplaced) - Roshevich's achnatherum

Formerly placed here

Species previously included in Achnatherum:

Amelichloa brachychaeta (Godr.) Arriaga & Barkworth (as Achnatherum brachychaetum (Godr.) Barkworth) - punagrass
Amelichloa caudata (Trin.) Arriaga & Barkworth (as Achnatherum caudatum (Trin.) S.L.W.Jacobs & J.Everett) - Chilean ricegrass
Amelichloa clandestina (Hack.) Arriaga & Barkworth (as Achnatherum clandestinum (Hack.) Barkworth) - Mexican ricegrass
Barkworthia stillmanii (Bol.) Romasch., P.M.Peterson & Soreng (as Achnatherum stillmanii (Bol.) Barkworth) - Stillman's needlegrass
Eriocoma arida (M.E.Jones) Romasch. (as Achnatherum aridum (M.E.Jones) Barkworth) - Mormon needlegrass
Eriocoma × bloomeri (Bol.) Romasch. (as Achnatherum × bloomeri (Boland.) Barkworth) - Bloomer's ricegrass
Eriocoma contracta (B.L.Johnson) Romasch. (as Achnatherum contractum (B.L. Johnson) Barkworth) - contracted ricegrass
Eriocoma coronata (Thurb.) Romasch. (as Achnatherum coronatum (Thurb.) Barkworth) - crested needlegrass
Eriocoma curvifolia (Swallen) Romasch. (as Achnatherum curvifolium (Swallen) Barkworth) - Guadalupe ricegrass
Eriocoma hymenoides (Roem. & Schult.) Rydb. (as Achnatherum hymenoides (Roem. & Schult.) Barkworth) - Indian ricegrass
Eriocoma hendersonii (Vasey) Romasch. (as Achnatherum hendersonii (Vasey) Barkworth) - Henderson's needlegrass
Eriocoma latiglumis (Swallen) Romasch. (as Achnatherum latiglume (Swallen) Barkworth) - wide-glumed needlegrass
Eriocoma lemmonii (Vasey) Romasch. (Achnatherum lemmonii (Vasey) Barkworth) - Lemmon's needlegrass
Eriocoma lettermanii (Vasey) Romasch. (as Achnatherum lettermanii (Vasey) Barkworth) - Letterman's needlegrass
Eriocoma lobata (Swallen) Romasch. (as Achnatherum lobatum (Swallen) Barkworth) - lobed needlegrass
Eriocoma nelsonii (Scribn.) Romasch. (as Achnatherum nelsonii (Scribn.) Barkworth) - Nelson's needlegrass, Dore's needlegrass
Eriocoma nevadensis (B.L.Johnson) Romasch. (as Achnatherum nevadense (B.L. Johnson) Barkworth) - Nevada needlegrass
Eriocoma occidentalis (Thurb. ex S.Watson) Romasch. (as Achnatherum occidentale (Thurb.) Barkworth) - western needlegrass
Eriocoma parishii (Vasey) Romasch. (as Achnatherum parishii (Vasey) Barkworth) - Parish's needlegrass
Eriocoma perplexa (Hoge & Barkworth) Romasch. (as Achnatherum perplexum Hoge & Barkworth) - perplexing needlegrass
Eriocoma pinetorum (M.E.Jones) Romasch. (as Achnatherum pinetorum (M.E. Jones) Barkworth) - pinewoods needlegrass
Eriocoma richardsonii (Link) Romasch. (as Achnatherum richardsonii (Link) Barkworth) - Richardson's needlegrass
Eriocoma robusta (Vasey) Romasch. (as Achnatherum robustum (Vasey) Barkworth) - sleepygrass
Eriocoma scribneri (Vasey) Romasch. (as Achnatherum scribneri (Vasey) Barkworth) - Scribner needlegrass
Eriocoma thurberiana (Piper) Romasch. (as Achnatherum thurberianum (Piper) Barkworth) - Thurber's needlegrass
Eriocoma swallenii (C.L.Hitchc. & Spellenb.) Romasch. (as Achnatherum swallenii (C.L. Hitchc. & Spellenb.) Barkworth) - Swallen's needlegrass
Eriocoma webberi Thurb. (as Achnatherum webberi (Thurb.) Barkworth) - Webber needlegrass
Neotrinia splendens (Trin.) M.Nobis, P.D.Gudkova & A.Nowak (as Achnatherum splendens (Trin.) Nevsky)
Pappostipa speciosa (Trin. & Rupr.) Romasch. (as Achnatherum speciosum Trin. & Rupr.) - desert needlegrass
Pentameris pallida (Thunb.) Galley & H.P.Linder (as Achnatherum capense (L.) P.Beauv.)
Ptilagrostis duthiei (Hook.f.) M.Nobis & P.D.Gudkova (as Achnatherum duthiei (Hook.f.) P.C.Kuo & S.L.Lu)
Pseudoeriocoma acuta (Swallen) Romasch. (as Achnatherum acutum (Swallen) Valdés-Reyna & Barkworth)
Pseudoeriocoma editorum (E.Fourn.) Romasch. (as Achnatherum editorum (E.Fourn.) Valdés-Reyna & Barkworth)
Pseudoeriocoma eminens (Cav.) Romasch. (as Achnatherum eminens (Cav.) Barkworth) - southwestern needlegrass
Thorneochloa diegoensis (Swallen) Romasch. (as Achnatherum diegoense (Swallen) Barkworth) - San Diego needlegrass
Timouria conferta (Poir.) Sennikov (as Achnatherum caragana (Trin.) Nevski)

References

^ ^a ^b ^c "Achnatherum P.Beauv". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 27 October 2024.
^ Watson L, Dallwitz MJ. (2008). "The grass genera of the world: descriptions, illustrations, identification, and information retrieval; including synonyms, morphology, anatomy, physiology, phytochemistry, cytology, classification, pathogens, world and local distribution, and references". The Grass Genera of the World. Archived from the original on 2008-10-14. Retrieved 2009-08-19.
^ Peterson PM, Romaschenko K, Soreng RJ, Valdés Reyna J (2019) A key to the North American genera of Stipeae (Poaceae, Pooideae) with descriptions and taxonomic names for species of Eriocoma, Neotrinia, Oloptum, and five new genera: Barkworthia, × Eriosella, Pseudoeriocoma, Ptilagrostiella, and Thorneochloa. PhytoKeys 126: 89-125. https://doi.org/10.3897/phytokeys.126.34096

CRC World Dictionary of Grasses - Common Names, Scientific Names, Eponyms, Synonyms, and Etymology - Volume I (A - D), by Umberto Quattrocchi, ISBN 978-0-8493-1303-5