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

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

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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.

Source: The Illustrated Flora of British Columbia

Habitat / 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.

Source: The Illustrated Flora of British Columbia


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) 238 630 1630
Slope Gradient (%) 0 4 15
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
135 201 320
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
6 6 8
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: CDF(1), CWH(25), ESSF(1), IDF(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 cool temperate & cool mesothermal.

Taxonomic and Nomenclatural Links

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General References