Oryzopsis

ricegrass
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
Michx.
Synonyms[1]

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.

Species[1][6]
  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

References

  1. 1 2 3 Kew World Checklist of Selected Plant Families
  2. ↑ Michaux, André 1803. Flora Boreali-Americana 1: 51 in Latin
  3. ↑ Michaux, André 1803. Flora Boreali-Americana 1: plate 9 line drawing of Oryzopsis asperifolia
  4. ↑ Tropicos, Oryzopsis Michx.
  5. ↑ Oryzopsis USDA Plants Database (24 Nov 2011)
  6. ↑ The Plant List search for Oryzopsis
  7. ↑ Oryzopsis asperifolia USDA Plants Database (24 Nov 2011)
  8. ↑ Biota of North American Biota Program 2013 county distribution map


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