Page author: Don Knoke
Glyceria borealis
small floating manna grass

Distribution: Alaska east to Newfoundland, south to California and New Mexico.

Habitat: Swamps, wet meadows, and stream margins, often growing in 1-3 feet of water.

Flowers: May - October

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Strongly rhizomatous perennial, the culms erect to decumbent and freely rooting, up to 1 m. tall.


Sheaths open for 1-4 cm., flattened, glabrous; ligules 5-10 mm. long, entire but often splitting; blades flat or folded, 3-5 mm. broad.


Inflorescence a narrow panicle up to 4.5 dm. long, the branches ascending; spikelets 6- to 11-flowered, linear, terete, 10-12 mm. long; glumes papery, 1-nerved, the first 2-2.5 mm. long, the second slightly longer; lemmas 3-4 mm. long, prominently 7-nerved to the scarious upper margin, the nerves non-convergent; stamens 3.

Accepted Name:
Glyceria borealis (Nash) Batch.
Publication: Proc. Manchester Inst. Arts Sci. 1: 74. 1900.

Synonyms & Misapplications:
Panicularia borealis Nash
Additional Resources:

PNW Herbaria: Specimen records of Glyceria borealis in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Glyceria borealis checklist entry.

E-Flora BC: Glyceria borealis atlas page.

CalPhotos: Glyceria borealis photos.

USDA Plants: Glyceria borealis information.

23 photographs:
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