Poa trivialis L.
rough bluegrass
Poaceae (Grass family)

Introduction to Vascular Plants


© Adolf Ceska     (Photo ID #13546)


E-Flora BC Static Map

Distribution of Poa trivialis
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Species Information

Perennial, loosely to densely tufted grass from fibrous roots, short-lived, sometimes stoloniferous; stems 25-120 cm tall.
Sheaths compressed, rough, margins open about 1/2-3/4 their length; sterile shoots sometimes trailing and rooting at nodes; blades 1-5 mm wide, flat, lax, not prow-tipped; ligules 3-10 mm long, the tips sharp-pointed to long-pointed, the backs rough.
Inflorescence an erect or lax panicle, 8-25 cm long, pyramidal, open, the branches 3 to 7 per node, spreading, distinctly rough angled, crowded; spikelets laterally compressed, 2.3-3.5 mm long, 2- to 4-flowered; lower glumes often sickle-shaped, 1-nerved; rachillas smooth or minutely bumpy; lemmas lanceolate, 2.3-3.5 mm long, the tips sharp-pointed, the surface smooth or rough, the keels and rarely the marginal nerves short silky-hairy below, lateral nerves prominent; calluses cobwebby; palea keels smooth, minutely bumpy, or slightly rough; flowers bisexual; anthers 1.3-2 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.

USDA Species Characteristics

Flower Colour:
Blooming Period:
Early Spring
Fruit/Seed characteristics:
Colour: Brown
Present over the Summer
Source:  The USDA


Ecological Framework for Poa trivialis

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)
297 0 1735
Slope Gradient (%)
15 0 50

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

185 45 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
4 2 7
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(42), CWH(3), ESSF(4), ICH(2), MS(3)

Habitat and Range

Moist disturbed sites in the lowland zone, infrequent in SW BC and the Queen Charlotte Islands; introduced from Eurasia.

SourceThe Illustrated Flora of British Columbia


Synonyms and Alternate Names:
Poa attica Boiss. & Heldr.