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

Agrostis microphylla Steud.
small-leaved bentgrass (small-leaf bentgrass)
Poaceae (Grass family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #9503)

E-Flora BC Static Map
Distribution of Agrostis microphylla
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Species Information

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Annual grass from fibrous roots, often in dense swards, drying and shrivelling by midsummer, all shoots flowering; stems 8-45 cm tall.
Sheaths smooth or hairy; blades 3-15 cm long, 0.7-2.5 mm wide, flat, becoming in-rolled; ligules 1.5-4 mm long.
Inflorescence very dense, cylindrical, more or less constricted, occasionally interrupted near the base, 2-12 cm long, the branches mainly appressed; spikelets numerous; glumes 2.5-5 mm long, the tips tapering gradually to long points; lemmas 1.5-2 mm long, rough short-hairy outside, the midribs extended at the tips into 2 teeth to 0.5 mm long, the awns 3.5-8 mm long from the middle on the back, bent, the callus hairs in dense tufts to 0.5 mm long; paleas absent or if present, as thin membranes to 0.2 mm long; anthers 0.4-0.6 mm long.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Wet vernal meadows, open forests and edges of temporary pools in the lowland zone; locally frequent on SE Vancouver Island and the Gulf Islands; S to CA and NW MX.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Agrostis microphylla

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)
Slope Gradient (%) 3 20 30
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
60 165 200
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 2 4
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: CWH(3)


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 mesothermal.

Synonyms and Alternate Names

Agrostis inflata Scribn.
Agrostis microphylla var. intermedia Beetle

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References