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Achnatherum hymenoides - Ricegrass.jpg
Oryzopsis hymenoides
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Monocots
(unranked): Commelinids
Order: Poales
Family: Poaceae
Subfamily: Pooideae
Tribe: Stipeae
Genus: Oryzopsis
Michx., 1803
Type species
Oryzopsis asperifolia

Dilepyrum Raf. 1808, illegitimate name not Michx. 1803

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.

  1. Oryzopsis asperifolia Michx. – roughleaf ricegrass [7] - Canada (all 10 provinces plus Yukon + Northwest Territories), United States (Northeast, Great Lakes, Black Hills, Rocky Mountains)[8]
  2. Oryzopsis chinensis Hitchc. - China
  3. Oryzopsis contracta (B.L.Johnson) Schltr. - Colorado, Wyoming, Montana
  4. Oryzopsis exigua Thurb. - Wyoming
  5. Oryzopsis hendersonii Vasey - Oregon, Idaho, Washington State
  6. Oryzopsis hymenoides (Roem. & Schult.) Ricker ex Piper - western North America from British Columbia + Alberta to California + New Mexico
  7. Oryzopsis pungens (Torr.) Hitchc. - Canada, northern United States
  8. Oryzopsis racemosa (Sm.) Ricker ex Hitchc. - eastern Canada, northeastern + north-central United States
  9. 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