Agrostis oregonensis Vasey
Oregon bentgrass
Poaceae (Grass family)

Introduction to Vascular Plants


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E-Flora BC Static Map

Distribution of Agrostis oregonensis
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Species Information

Perennial, tufted grass from fibrous roots, the tufts scattered; stems 12-75 cm tall.
Sheaths smooth; blades 10-30 cm long, 2-4 mm wide, flat; ligules 2-4.5 mm long.
Inflorescence egg-shaped, usually very loose and open, 8-35 cm long, at least twice as long as wide, the branches spreading, the lower branches 2-10 cm long, ascending, branching above the middle; spikelets sparse; glumes 2.2-3.6 mm long; lemmas 1.5-2.5 mm long, awnless, the callus hairs sparse, to 0.2 mm long; paleas absent or if present, as thin membranes less than 1/4 as long at the lemmas, to 0.2 mm long; anthers 0.5-1.2 mm long.

SourceThe Illustrated Flora of British Columbia


If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.


Ecological Framework for Agrostis oregonensis

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)
630 238 1630
Slope Gradient (%)
4 0 15

Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]

201 135 320
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
6 6 8
Modal Nutrient Regime
# of field plots
 species was recorded in:
Modal BEC Zone Class

All BEC Zones (# of stations/zone) species was recorded in

CDF(1), CWH(25), ESSF(1), IDF(1)

Habitat and Range

Moist to wet meadows, streamsides, bogs, fens and forest openings in the lowland zone; frequent in coastal BC; N to AK and S to WY, ID, NV and CA.

SourceThe Illustrated Flora of British Columbia