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

Poa confinis Vasey
beach bluegrass (coastline bluegrass)
Poaceae (Grass family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #9408)

E-Flora BC Static Map
Distribution of Poa confinis
Click here to view the full 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 grass from fibrous roots, rhizomes and stolons; stems erect or decumbent, 7-30 cm tall, about 0.5 mm wide.
Sheath margins open 1/3-2/3 their length; sterile shoots slender, tufted; blades 0.5-1.5 mm wide, in-rolled, mostly threadlike, moderately thick, outer surface smooth, inner surface of blades of sterile shoots usually distinctly rough or minutely soft-hairy; ligules 0.5-2 mm long, the tips blunt to sharp-pointed, backs rough.
Inflorescence an erect panicle, 1-5 cm long, moderately congested, loosely contracted, the branches 1 to 2 per node, sparsely to distinctly rough; spikelets laterally compressed, 3-8 mm long, 2- to 5-flowered; glumes unequal, the lower ones 2.5-3 mm long, 1- to 3-nerved, the upper ones 3-4 mm long; rachillas hairless or sparsely minutely soft-hairy; lemmas lanceolate, 2.5-4 (4.5) mm long, the tips sharp-pointed, surface finely rough, hairless, or keel and some marginal nerves sparsely minutely soft-hairy below; calluses hairless or diffusely, shortly, sparsely cobwebby; palea keels rough; flowers of different plants female, male or all or partially bisexual (mixed female and bisexual); anthers vestigial or 1.5-2 mm long.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Semi-stable sandy sites and beaches in the lowland zone; infrequent in coastal BC; S to N CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Poa confinis

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) 2 2 2
Slope Gradient (%) 0 0 0
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 2 2
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(1)


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.

Taxonomic and Nomenclatural Links

Additional Photo Sources

Related Databases

General References