Glyceria maxima

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Legend for Species Pages

reed mannagrass

Glyceria maxima (Hartm.) Holmb.


Glyceria spectabilis Mert. & W.D.J. Koch

Molinia maxima Hartm.

  • ANPC Rank –
  • Moss, Flora of Alberta – No
  • Global Invasive Species Database – Yes, Eurasian [1]
  • NatureServe Rank – Not yet assessed
  • Haber, Upland – No
  • Haber, Wetland – Minor
  • CWF, Status & Invasive Range – Potential, AB, ON, NF
  • Alberta Revegetation Guidelines – No
  • The Nature Conservancy – Yes
  • CBCN – Potential
  • AB Weed – No


[2]Link to Grass Manual on the Web, 3.Glyceria maxima (Hartm.) Holmb. - "...Glyceria maxima is native to Eurasia. It grows in wet areas, including shallow water, at scattered locations in the Flora region. It is an excellent fodder grass, and may have been planted deliberately at one time (Dore and McNeill 1980). At some sites, the species appears to be spreading, largely vegetatively. It is easily confused with large specimens of G. grandis, but differs in its firmer, more prow-tipped lemmas as well as its larger lemmas and usually larger anthers..."

[3] Link to USDA Plants profile for Glyceria maxima (Hartm.) Holmb. reed mannagrass

[4]Link to ISSG, Global Invasive Species Database, Glyceria maxima (aquatic plant, grass) "...Glyceria maxima is a native to Europe and temperate Asia and has been intentionally introduced as livestock forage in seasonally inundated pastures, to temperate North America, New Zealand and Australia. In its native distribution in Europe, Glyceria maxima forms monocultures in wetlands that reduce plant species diversity. In areas of introduction, including North America and Australia, Glyceria maxima also forms monocultures and is now of conservation concern..."

[5]Link to Weeds of Australia, Reed sweet-grass Glyceria maxima factsheet (with photos)