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

Glyceria canadensis (Michx.) Trin.
rattlesnake-grass (rattlesnake mannagrass)
Poaceae (Grass family)

Introduction to Vascular Plants
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Distribution of Glyceria canadensis
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Glyceria canadensis var. canadensis

Species Information

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Perennial herb from rhizomes; stems erect, simple, hollow, solitary or a few in a tuft, smooth or slightly rough, about 60-100 cm tall.
Sheaths shorter than the internodes, those at the base overlapping; blades 3-8 mm wide, rough; ligules cut off at the ends, 5-6 mm long.
Inflorescence a diffuse panicle, about 18 cm long, the branches spreading-ascending or often drooping, 6-13 cm long, the branches bearing spikelets mostly toward the tips; spikelets mostly 5- to 12-flowered, flattened, broadly egg-shaped, turgid, 3-8 mm long; glumes unequal, pointed, 1-nerved, translucent-margined, the lower ones lanceolate, 1.6-2.4 mm long, the upper ones broadly egg-shaped, 2.1-3 mm long; lemmas obscurely 7-nerved, broadly egg-shaped, 2.9-4 mm long, blunt or somewhat pointed to sharp-pointed at the tips, the margins thin or translucent; paleas often exposed, rounded to egg-shaped; stamens 2; anthers 0.6-1 mm long.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
Blooming Period:
Fruit/Seed characteristics:
Colour: Brown
Present from Spring to Summer
Source:  The USDA

Habitat / Range

Wet ditches, marshes and shallow water in the lowland zone; infrequent in the lower Fraser Valley; introduced from E North America.

Source: The Illustrated Flora of British Columbia


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

Panicularia canadensis (Michx.) Kuntze

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References