Oryzopsis

Ricegrass
Oryzopsis hymenoides
Scientific classification
Kingdom:	Plantae
Clade:	Embryophytes
Clade:	Tracheophytes
Clade:	Spermatophytes
Clade:	Angiosperms
Clade:	Monocots
Clade:	Commelinids
Order:	Poales
Family:	Poaceae
Subfamily:	Pooideae
Supertribe:	Stipodae
Tribe:	Stipeae
Genus:	Oryzopsis Michx., 1803
Type species
Oryzopsis asperifolia Michx.
Synonyms1
Dilepyrum Raf. 1808, illegitimate name not Michx. 1803

Oryzopsis is a genus of Chinese and North American plants in the grass family.²³⁴ Species from this genus are commonly called ricegrass.⁵

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

Species¹⁶

• 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 swallenii C.L.Hitchc.& Spellenb. - Idaho, Wyoming

formerly included¹

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