E-Flora BC: Electronic Atlas of the Flora of British Columbia

Oryzopsis asperifolia Michx.
rough-leaved ricegrass (roughleaf ricegrass)
Poaceae (Grass family)

Introduction to Vascular Plants

© Adolf Ceska  Email the photographer   (Photo ID #5726)

E-Flora BC Static Map
Distribution of Oryzopsis asperifolia
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Species Information

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Perennial, tufted grass from fibrous roots; stems hollow, often equalled or exceeded by the erect, stiff blades of the offsets at the stem bases, 20-50 cm tall.
Sheaths open; blades of the stems usually greatly reduced or lacking, erect, flat or slightly in-rolled, strongly rough, tapering strongly at each end, 3-7 mm wide; ligules more or less fringed with fine hairs, blunt, usually higher on the sides than at the back, about 0.5 mm long.
Inflorescence often a nearly simple raceme with all the flowers and branches more or less to one side, 4-8 cm long; glumes broad, about 7 mm long, nearly equal, 7-nerved, the margins more or less jagged, abruptly narrowed to sharp-pointed tips; lemmas appressed-hairy, about equalling the glumes, stoutly awned from the tips, the awns 5-10 mm long, once bent, strongly crisp-hairy on the upper parts of the calluses; paleas about equal to the lemmas; lodicules 2, lanceolate, faintly 2-nerved, about 5 mm long; anthers about 3.5 mm long, the tips tufted with stiff hairs.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Mesic to dry, gravelly or rocky open forests and forest openings in the montane zone; frequent in BC east of the Coast-Cascade Mountains; N to NW NT, E to NF and S to ME, MA, VA, WV, IN, IA, SD, NM, UT, ID and WA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Oryzopsis asperifolia

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class




Elevation (metres) 6 899 2125
Slope Gradient (%) 0 16 220
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
0 197 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 3 7
Modal Nutrient Regime
Number of field plots
 species was recorded in:
Modal BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in: BG(1), BWBS(63), ESSF(34), ICH(370), IDF(339), MS(191), PP(10), SBPS(141), SBS(771), SWB(1)


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References