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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: Oryzopsis
Species: O. aequiglumis – O. alpestris – O. angustifolia – O. asperifolia – O. barbellata – O. blancheana – O. chinensis – O. coerulescens – O. contracta – O. ferganensis – O. gracilis – O. grandispicula – O. henryi – O. hilariae – O. holciformis – O. lateralis – O. latifolia – O. molinioides – O. munroi – O. obtusa – O. pamiralaica – O. paradoxa – O. platyantha – O. purpurascens – O. rechingeri – O. sogdiana – O. songarica – O. sphacelata – O. tibetica – O. vavilovii – O. vicaria – O. virescens

Oryzopsis Michx., Fl. Bor.-Amer. 1: 51 (1803)
Type species: Oryzopsis asperifolia Michx., Fl. Bor.-Amer. 1: 51 (1803)


Dilepyrum Raf., Med. Repos. 5: 352 (1808), nom. illeg.


Michaux, A. 1803. Flora Boreali-Americana 1: 51, pl. 9.
Govaerts, R. et al. 2013. Oryzopsis in World Checklist of Selected Plant Families. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the internet. Accessed: 2013 Dec. 17. Reference page. This source has a much narrower generic circumscription compared to Simon et al.
International Plant Names Index. 2013. Oryzopsis. Published online. Accessed: 17 Dec. 2013.
Simon, B.K., Clayton, W.D., Harman, K.T., Vorontsova, M., Brake, I., Healy, D. & Alfonso, Y. 2013. GrassWorld, Oryzopsis. Published on the internet. Accessed: 2013 Dec. 17. 2013. Oryzopsis. Missouri Botanical Garden. Published on the internet. Accessed: 2013 Dec. 17.

Vernacular names
English: Ricegrass

Oryzopsis is a genus of Chinese and North American plants in the grass family.[2][3][4] Species from this genus are commonly called ricegrass.[5]

The name alludes to the resemblance between this genus and true rice, Oryza.


Oryzopsis asperifolia Michx. – roughleaf ricegrass [7] - Canada (all 10 provinces plus Yukon + Northwest Territories), United States (Northeast, Great Lakes, Black Hills, Rocky Mountains)[8]
Oryzopsis chinensis Hitchc. - China
Oryzopsis contracta (B.L.Johnson) Schltr. - Colorado, Wyoming, Montana
Oryzopsis exigua Thurb. - Wyoming
Oryzopsis hendersonii Vasey - Oregon, Idaho, Washington state
Oryzopsis holciformis (M.Bieb.) Hack. (syn. Piptatherum holciforme (M.Bieb.) Roem. & Schult.) - Israel
Oryzopsis hymenoides (Roem. & Schult.) Ricker ex Piper - western North America from British Columbia + Alberta to California + New Mexico
Oryzopsis pungens (Torr.) Hitchc. - Canada, northern United States
Oryzopsis racemosa (Sm.) Ricker ex Hitchc. - eastern Canada, northeastern + north-central United States
Oryzopsis swallenii C.L.Hitchc.& Spellenb. - Idaho, Wyoming

formerly included[1]

numerous species once regarded as members of Oryzopsis but now considered better suited to other genera: Achnatherum Achnella Anemanthele Eriocoma Nassella Piptatherum Piptatheropsis Piptochaetium Ptilagrostis Stipa Stiporyzopsis


Kew World Checklist of Selected Plant Families
Michaux, André 1803. Flora Boreali-Americana 1: 51 in Latin
Michaux, André 1803. Flora Boreali-Americana 1: plate 9 line drawing of Oryzopsis asperifolia
Tropicos, Oryzopsis Michx.
Oryzopsis USDA Plants Database (24 Nov 2011)
The Plant List search for Oryzopsis
Oryzopsis asperifolia USDA Plants Database (24 Nov 2011)
Biota of North American Biota Program 2013 county distribution map

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