Agrostis variabilis Rydb.
mountain bentgrass (variable bentgrass)
Poaceae (Grass family)

Introduction to Vascular Plants


Once images have been obtained, photographs of this taxon will be displayed in this window.Click on the image to enter our photo gallery.
Currently no image is available for this taxon.


E-Flora BC Static Map

Distribution of Agrostis variabilis
Click here to view the full interactive map and legend

Species Information

Perennial, densely tufted grass from fibrous roots, sometimes from short rhizomes less than 5 cm long; stems 4-30 cm tall.
Sheaths smooth; blades 3-7 cm long, less than 2 mm wide, flat, becoming folded; ligules 1-2.5 mm long.
Inflorescence narrowly cylindrical, more or less constricted, usually dense, 2-8 cm long, the branches ascending to erect or appressed, the lower ones 0.5-1.5 cm long, the spikelets numerous, few or none near the branch base; glumes 2-2.5 mm long, rough short-hairy on the keels, pointed; lemmas 1.5-2 mm long, awnless, the callus hairs sparse to abundant, to 0.2 mm long; paleas absent; anthers 0.5-0.7 mm long.
See comments under A. humilis.

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 variabilis

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)
1967 850 2649
Slope Gradient (%)
23 0 100

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

183 20 342
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
3 0 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

AT(35), BAFA(1), BWBS(1), ESSF(57), ICH(2), IMA(7), MS(4), SBPS(1), SBS(1)

Habitat and Range

Mesic to moist meadows, moraines and rocky slopes in the subalpine to alpine zones; frequent in BC in and E of the Coast-Cascade Mountains; E to AB and S to NM, UT, NV and CA.

SourceThe Illustrated Flora of British Columbia


Synonyms and Alternate Names:
Agrostis rossiae Vasey