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Montana Field Guide

Montana Field Guides

Boreal Mannagrass - Glyceria borealis

Native Species

Global Rank: G5
State Rank: S4

Agency Status
MNPS Threat Rank:
C-value: 6

External Links

General Description
Stems 80–150 cm. Leaves: leaf blades 2–5 (7) mm wide, ligules 5–11 mm long. Inflorescence a narrow panicle 20–45 cm long, branches ascending. Spikelets 8–15 mm long, round in cross-section. Lemmas 8 to 12 per spikelet (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

Range Comments
Sporadic throughout much of North America although absent in the southeast (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 126

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)


  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Horpestad, A.A. 1969. Factors affecting the distribution and abundance of aquatic macrophytes in parts of the Madison, Firehole and Gibbon Rivers. M.Sc. Thesis. Bozeman, MT: Montana State University. 88 p.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
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Citation for data on this website:
Boreal Mannagrass — Glyceria borealis.  Montana Field Guide.  .  Retrieved on , from