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Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Monocots
Cladus: Commelinids
Ordo: Poales

Familia: Poaceae
Subfamilia: Pooideae
Tribus: Stipeae
Genus: Achnatherum
Species: (sensu Simon (et al.) (2013))
A. acutum – A. altum – A. aridum – A. arnowiae – A. botschantzevii – A. bracteatum – A. breviaristatum – A. bromoides – A. calamagrostis – A. capense – A. caragana – A. chingii – A. clandestinum – A. constrictum – A. contractum – A. coreanum – A. coronatum – A. curvifolium – A. diegoense – A. duthiei – A. editorum – A. eminens – A. hendersonii – A. henryi – A. hirticulme – A. hymenoides – A. inaequiglume – A. inebrians – A. jacquemontii – A. latiglume – A. lettermanii – A. lobatum – A. mongholicum – A. multinode – A. nakaii – A. nelsonii – A. nevadense – A. occidentale – A. ordubadense – A. parishii – A. pekinense – A. perplexum – A. petriei – A. pinetorum – A. psilantherum – A. pubicalyx – A. richardsonii – A. robustum – A. saposhnikowii – A. scribneri – A. sibiricum – A. speciosum – A. splendens – A. stillmanii – A. swallenii – A. thurberianum – A. wallowaensis – A. webberi

Nothospecies: A. x bloomeri
WCSP accepts this as × Stiporyzopsis bloomeri (Bol.) B.L.Johnson, Amer. J. Bot. 32: 602 (1945).
Name

Achnatherum P.Beauv., Ess. Agrostogr.: 19. 1812.

Type species: Achnatherum calamagrostis (L.) P.Beauv., Ess. Agrostogr.: 19 (1812)

References

This genus is circumscribed as a synonym of Stipa and other genera by GrassBase, but the species above are accepted by GrassWorld. WCSP accept a far narrower circumscription. It is also reported as being in limbo with species being transferred to Eriocoma itself a possible synonym of Oryzopsis. The whole clade appears to be in transition!

Palisot de Beauvois, .M.F.J. (1812) Essai d'une Nouvelle Agrostographie 19, 146, pl. 6, f. 7.
Govaerts, R. et al. 2013. Achnatherum in World Checklist of Selected Plant Families. The Board of Trustees of the Royal Botanic Gardens, Kew. Published online. Accessed: 2013 Oct. 31. Reference page.
Simon, B.K., Clayton, W.D., Harman, K.T., Vorontsova, M., Brake, I., Healy, D. & Alfonso, Y. 2013. GrassWorld, Achnatherum. Published online. Accessed: 2013 Oct. 31.
Tropicos.org 2013. Achnatherum. Missouri Botanical Garden. Published online. Accessed: 31 Oct. 2013.
International Plant Names Index. 2013. Achnatherum. Published online. Accessed: 31 Oct. 2013.
Global Biodiversity Information Facility. 2019. GBIF Backbone Taxonomy. Checklist dataset. Taxon: Achnatherum. .

Vernacular names
suomi: Hopearöyhyt

Achnatherum is a genus of plants which includes several species of needlegrass.[1] 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

Species recognized by Plants of the World Online as of November 2019:[2]

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

References

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.

"Achnatherum". Plants of the World Online. Royal Botanic Gardens Kews. 2019. Retrieved 3 November 2019.

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

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