Perennial, densely tufted grass from fibrous roots; stems 20-75 cm tall.
Sheaths smooth, blades mostly basal, 4-14 cm long, 1-3 mm wide, flat, finely rough short-hairy; ligules 2-5 mm long.
Inflorescence broadly egg-shaped, open, large, upright, 10-30 cm long, about as wide as long, very diffuse with hairlike, lax branches 8-25 cm long, frequently detaching at maturity, the lower branches 4-11 cm long, broadly spreading at maturity, branched 1 or 2 times above the middle, the spikelets few, broadly separated at the tips of the branches, not near the base; glumes 1.5-3 mm long, rough short-hairy on the keels; lemmas 1.5-2 mm long, awnless or sometimes awned from below the middle on the back, the awns to 2 mm long, more or less straight, the callus hairs minute; paleas absent or if present, minute, less than 1/4 as long as the lemmas; anthers 0.4-0.7 mm long.
Agrostis perennans (Walt.) Tuckerm., hitherto regarded as an eastern species, has recently been found in WA and can be expected in BC. It differs from A. scabra in its slightly more condensed but still hairlike inflorescence and few or no basal leaves at flowering time but several well-developed stem leaves. It grows on moist to wet cliffs and streamsides. See also comments under A. idahoensis.
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.
Illustration Source: The Illustrated Flora of British Columbia
Present over the Summer
Source: The USDA
||Value / Class
Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
of field plots
species was recorded in:
BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in
|BG(5), BWBS(17), CDF(5), CMA(1), CWH(52), ESSF(123), ICH(77), IDF(67), MH(15), MS(104), PP(1), SBPS(41), SBS(116), SWB(2)|
Source: Klinkenberg 2013
Synonyms and Alternate Names:
Agrostis geminata Trin.
Agrostis hyemalis (Walter) Britton, Sterns & Poggenb.
Agrostis hyemalis var. geminata (Trin.) A.S. Hitchc.
Agrostis hyemalis var. scabra (Willd.) Blomquist
Agrostis hyemalis var. tenuis (Tuckerman) Gleason
Agrostis scabra subsp. septentrionalis (Fern.) A.& D. L÷ve
Agrostis scabra var. geminata (Trin.) Swallen
Agrostis scabra var. septentrionalis Fern.