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

Poa nemoralis L.
wood bluegrass (interior bluegrass (ssp. interior); woods bluegrass (ssp. nemoralis))
Poaceae (Grass family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #11522)

E-Flora BC Static Map
Distribution of Poa nemoralis
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.

PMPOA4Z1S2
PMPOA4Z1S1


General:
Perennial, tufted grass from fibrous roots, green or glaucous; stems mostly erect or ascending, 5-80 cm tall, 0 to 5 nodes exserted, uppermost node usually in the middle to upper 1/3 of stem.
Leaves:
Sheath margins open 4/5-9/10 their length; sterile shoots all or most flowering within a season, next year's shoots set late in the growing season, all or most breaking through sheath bases with indistinct two-keeled buds protecting the scales; basal leaves bladeless; blades 0.8-3 mm wide, mostly flat, appressed or abruptly ascending to spreading, strict or somewhat lax; ligules 0.2-3 mm long, the tips blunt to rounded, minutely rough, the backs distinctly rough.
Flowers:
Inflorescence an erect or lax panicle, 4-20 cm long, narrowly lanceolate to egg-shaped, sparsely to moderately congested, the branches 2 to 5 per node, ascending to widely spreading, slender, moderately to distinctly rough on angles, the stalks shortly exserted; spikelets laterally compressed, 3-8 mm long, (1) 2- to 5-flowered; glumes awl-like to lanceolate, the lower ones 3-nerved; rachilla internodes mostly less than 1 mm long, smooth or rough, hairless or minutely soft-hairy; lemmas narrowly lanceolate to lanceolate, 2.4-4 mm long, the tips usually bronze-coloured in part, sharp-pointed, the keels and marginal nerves short silky-hairy, hairless or infrequently sparsely and minutely soft-hairy between the nerves; calluses sparsely and often short-cobwebby (rarely hairless); palea keels rough; flowers bisexual (some appearing female-like due to aborted anthers); anthers (0.8) 1.2-2.5 mm long.
Notes:
Two subspecies occur in BC:

1. Uppermost culm nodes located on the upper 2/3 of the culms, 2-4 nodes exposed at maturity; ligules less than 0.8 (1) mm long; culms not rough below the panicles; lowest glumes awl-like to narrowly lanceolate, nearly equaling the lowest lemmas in length.................... ssp. nemoralis

1. Uppermost culm nodes located on the lower 1/2 of the culms (sometimes higher), 0-2 (3) nodes exposed at maturity; ligules more than (0.8) 1 mm long; culms sometimes rough below the panicles; lowest glumes narrowly to broadly lanceolate, 3/4 or less the length of the lowest lemmas.................... ssp. interior (Rydb.) W. A. Weber

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry to mesic meadows, rocky slopes and open forests in the montane zone (ssp. interior); moist forests and disturbed sites in the lowland zone (ssp. nemoralis); frequent E of the Coast-Cascade Mountains (ssp. interior), infrequent in SW BC (ssp. nemoralis); N to AK, YT and NT, E to PQ and S to VT, IL, MO, TX, NM, ID and WA (ssp. interior), introduced from Eurasia (ssp. nemoralis).

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Poa nemoralis

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) 250 1165 2500
Slope Gradient (%) 0 22 97
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
0 218 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
1 3 7
Modal Nutrient Regime
Class
D
Number of field plots
 species was recorded in:
77
Modal BEC Zone Class
IDF
All BEC Zones (# of stations/zone) species was recorded in: BG(1), BWBS(4), CWH(1), ESSF(18), ICH(1), IDF(18), IMA(1), MS(7), SBPS(2), SBS(18)

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.

Synonyms and Alternate Names

Poa interior Rydb.
Poa nemoralis var. interior (Rydb.) Butters & Abbe

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References