Glyceria borealis (Nash) Batchelder
northern mannagrass (small floating mannagrass)
Poaceae (Grass family)

Introduction to Vascular Plants


© Jamie Fenneman     (Photo ID #10350)


E-Flora BC Static Map

Distribution of Glyceria borealis
Click here to view the full interactive map and legend

Species Information

Perennial grass from conspicuous rhizomes, freely rooting; stems erect to more or less decumbent, hollow, 80-150 cm tall/long.
Sheaths somewhat flattened, smooth, open for 1-4 cm; blades (2) 3-5 (6) mm wide, flat or folded, more or less pimpled on the upper surfaces; ligules pointed, entire but usually splitting, minutely hairy, (4) 5-10 mm long.
Inflorescence a narrow panicle, 18-50 cm long, the branches ascending-appressed; spikelets mostly 6- to 11-flowered, linear, tapered at the tips, 10-12 (15) mm long; lower glumes (1.5) 2-2.5 mm long, the upper ones slightly over 3 mm long; lemmas prominently 7-nerved to the narrow, translucent upper margins, 3-4 mm long, smooth, minutely rough on the nerves; stamens 3; anthers 0.5-1 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:
Late Spring
Fruit/Seed characteristics:
Colour: Yellow
Present from Spring to Summer
Source:  The USDA


Ecological Framework for Glyceria borealis

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)
960 130 1655
Slope Gradient (%)
0 0 14

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

106 20 171
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
7 5 8
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(10), CWH(3), ESSF(2), ICH(2), IDF(17), MS(1), PP(1), SBPS(6), SBS(7)

Habitat and Range

Swamps, lakeshores and wet meadows (often in water up to 1 m deep) in the lowland and montane zones; frequent in SW BC, infrequent in SC BC; N to AK and YT, E to NF and S to ME, MA, PA, IN, IA, SD, NM, AZ and CA.

SourceThe Illustrated Flora of British Columbia


Synonyms and Alternate Names:
Panicularia borealis Nash