Glyceria canadensis (Michx.) Trin. - Rattlesnake Mannagrass


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Glyceria canadensis - (image 1 of 4)



Family: Poaceae


Swamps, bogs, wet woods, springy areas.




Newfoundland west to MN, south to NJ and IL.


Erect perennial to 1 m; stems solitary or in small tufts. Leaves 3-8 mm wide; ligule 2-6 mm. Inflorescence 10-30 cm long, diffuse, branches nodding with most spikelets borne near the tip; spikelets broadly ovate, 4-8 mm, each with 5-10 flowers; glumes with scarious margins; first glume lanceolate, 1.6-2.4 mm; second glume broadly ovate, about 2.2 mm; lemmas broadly ovate, veins visible but not raised, 2.9-4 mm, margins thin or scarious, not covering the sides of the palea, the tip acute and projecting 0.5 mm past the palea; palea round-obovate; stamens 2.


Flowers: June

Wetland indicator: Obligate

The common name may come from the superficial resemblance of the spikelets to the tail of a rattlesnake.


Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Second Ed.

The New York Botanical Garden. Bronx, NY


Swink, F. and G. Wilhelm. 1994. Plants of the Chicago Region.
Indiana Academy of Science. The Morton Arboretum. Lisle, Illinois.




 Michael Hough 2010