Oryzopsis is a genus of Chinese and North American plants in the grass family.Michaux, André 1803. Flora Boreali-Americana 1: 51 in LatinMichaux, André 1803. Flora Boreali-Americana 1: plate 9 line drawing of Oryzopsis asperifoliaTropicos, Oryzopsis Michx. Species from this genus are commonly called ricegrass.Oryzopsis USDA Plants Database (24 Nov 2011)
The name alludes to the resemblance between this genus and true rice, Oryza.
SpeciesThe Plant List search for Oryzopsis Oryzopsis asperifolia – roughleaf ricegrass Oryzopsis asperifolia USDA Plants Database (24 Nov 2011) - Canada (all 10 provinces plus Yukon + Northwest Territories), United States (Northeast, Great Lakes, Black Hills, Rocky Mountains)Biota of North American Biota Program 2013 county distribution map Oryzopsis chinensis - China Oryzopsis contracta - Colorado, Wyoming, Montana Oryzopsis exigua - Wyoming Oryzopsis hendersonii - Oregon, Idaho, Washington state Oryzopsis holciformis (syn. Piptatherum holciforme (M.Bieb.) Roem. & Schult.) - Israel Oryzopsis hymenoides - western North America from British Columbia + Alberta to California + New Mexico Oryzopsis pungens - Canada, northern United States Oryzopsis swallenii - Idaho, Wyoming
formerly included 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
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