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

Poa trivialis L.
rough bluegrass
Poaceae (Grass family)

Introduction to Vascular Plants

© Adolf Ceska  Email the photographer   (Photo ID #13546)

E-Flora BC Static Map
Distribution of Poa trivialis
Click here to view our interactive map and legend
Details about map content are available here
Click on the map dots to view record details.

Species Information

Click on the image below to view an expanded illustration for this species.

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.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

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

Habitat / Range

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

Source: The Illustrated Flora of British Columbia


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) 0 297 1735
Slope Gradient (%) 0 15 50
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
45 185 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 4 7
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(42), CWH(3), ESSF(4), ICH(2), MS(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 not evaluated, unknown or variable.

Synonyms and Alternate Names

Poa attica Boiss. & Heldr.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References