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

Poa laxiflora Buckley
lax-flowered bluegrass (looseflower bluegrass)
Poaceae (Grass family)

Introduction to Vascular Plants
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Distribution of Poa laxiflora
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Species Information

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General:
Perennial, loosely tufted grass from fibrous roots and long rhizomes or with isolated shoots; stems 50-120 cm tall.
Leaves:
Sheaths usually rough, the projections pointed downward, the margins open 1/4-1/2 their length; blades 3-6 mm wide, flat, narrowly prow-tipped; ligules 2-3.5 mm long, the backs smooth or slightly rough.
Flowers:
Inflorescence a panicle, 14-30 cm long, open, sparse, the branches mostly 1 to 2 per node, widely spreading, the longest 5.5-12 cm long, slightly to moderately rough-angled; spikelets laterally compressed, 4-8 mm long, 2- to 4-flowered; lower glumes 1- to 3-nerved; rachilla internodes about 1 mm long, smooth, hairless; lemmas lanceolate, 3.2-6 mm long, the tips sharp-pointed, surface smooth or sparsely rough, the keels and marginal nerves sparsely short silky-hairy, lateral nerves rarely sparsely, minutely soft-hairy and moderately prominent, hairless between the nerves; calluses cobwebby; palea keels more or less rough, hairless; flowers bisexual, normal (rarely bulbiferous); anthers 0.5-1.1 mm long.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist old-growth forests and rocky slopes in the lowland and montane zones; infrequent in and W of the Coast-Cascade Mountains; N to SE AK and S to NW OR.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Poa laxiflora

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

Minimum

Average

Maximum

Elevation (metres) 670 1387 2035
Slope Gradient (%) 0 23 75
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
28 308 344
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
1 4 8
Modal Nutrient Regime
Class
D
Number of field plots
 species was recorded in:
19
Modal BEC Zone Class
ESSF
All BEC Zones (# of stations/zone) species was recorded in: ESSF(8), IDF(7), MS(3), SBPS(1)

Climate

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

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General References