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Montana Field Guide

Montana Field Guides

American Mannagrass - Glyceria grandis

Native Species

Global Rank: G5
State Rank: S4
C-value: 7

Agency Status


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General Description
Stems 1–2 m. Leaves: blades 2–12 mm wide, ligules mostly 5–7 mm long. Inflorescence an open diffuse panicle, 20–40 cm long, the branches spreading and often drooping. Spikelets 3–7 mm long, laterally compressed. Lemmas 2 to 7 (rarely 8) per spikelet (Lavin in Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range


Range Comments
Throughout most of North America excepting many southeastern states. (Lavin in Lesica et al. 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)


  • Literature Cited AboveLegend:   View Online Publication
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Culver, D.R. 1994. Floristic analysis of the Centennial Region, Montana. M.Sc. Thesis. Montana State University, Bozeman. 199 pp.
    • Joslin, G.J. 1975. Behavior and environmental selection by Elk (Cervus canadensis nelsoni) during surrmer and fall in the First and Second Yellow Mule drainages, Madison County, Montana. M.Sc. Thesis. Bozeman, Montana: Montana State University, Bozeman. 65 p.
  • Web Search Engines for Articles on "American Mannagrass"
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Citation for data on this website:
American Mannagrass — Glyceria grandis.  Montana Field Guide.  .  Retrieved on , from