Glyceria
mannagrass
10 species
2 subspecies and varieties
2 subspecies and varieties
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Glyceria borealis – small floating mannagrass
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, northern Great Plains, Great Lakes region, and northeastern North America.
Habitat: Swamps, wet meadows, and stream margins, often growing in 1-3 feet of water.
Origin: Native
Flowers: May-October
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, northern Great Plains, Great Lakes region, and northeastern North America.
Habitat: Swamps, wet meadows, and stream margins, often growing in 1-3 feet of water.
Origin: Native
Flowers: May-October
Growth Duration: Perennial
Glyceria canadensis – Canada mannagrass, rattlesnake mannagrass
Distribution: Occurring west of the Cascades crest in Washington; introduced from southwestern British Columbia to northwestern Oregon, native from the Great Plains to eastern North America.
Habitat: Swamps, bogs, lakeshore marshes, and wet forest.
Origin: Introduced from central and eastern North America
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring west of the Cascades crest in Washington; introduced from southwestern British Columbia to northwestern Oregon, native from the Great Plains to eastern North America.
Habitat: Swamps, bogs, lakeshore marshes, and wet forest.
Origin: Introduced from central and eastern North America
Flowers: June-August
Growth Duration: Perennial
• var. canadensis – rattlesnake mannagrass
Glyceria declinata – low glyceria, waxy mannagrass
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California, scattered eastward across North America.
Habitat: Vernal pools, disturbed wetlands.
Origin: Introduced from Europe
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California, scattered eastward across North America.
Habitat: Vernal pools, disturbed wetlands.
Origin: Introduced from Europe
Flowers: June-August
Growth Duration: Perennial
Glyceria elata – tall mannagrass
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south on both sides of the Cascades to California, east to Montana and New Mexico.
Habitat: Lake margins, stream banks, moist mountain meadows and other wet areas.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south on both sides of the Cascades to California, east to Montana and New Mexico.
Habitat: Lake margins, stream banks, moist mountain meadows and other wet areas.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
Glyceria fluitans – water mannagrass
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, also in central and eastern North America.
Habitat: Wetlands.
Origin: Introduced from Eurasia
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, also in central and eastern North America.
Habitat: Wetlands.
Origin: Introduced from Eurasia
Flowers: June-August
Growth Duration: Perennial
Glyceria grandis – American mannagrass, reed mannagrass
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Sloughs, damp meadows and stream borders.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Sloughs, damp meadows and stream borders.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
• var. grandis – reed mannagrass
Glyceria leptostachya – slender-spike mannagrass
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to California.
Habitat: Swamps, margins of streams and lakes.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to California.
Habitat: Swamps, margins of streams and lakes.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Glyceria maxima – tall mannagrass
Distribution: Occurring west of the Cascades crest in Washington; Alaska to Washiington; also in eastern North America.
Habitat: Swamps, pond and lake margins.
Origin: Introduced from Eurasia
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring west of the Cascades crest in Washington; Alaska to Washiington; also in eastern North America.
Habitat: Swamps, pond and lake margins.
Origin: Introduced from Eurasia
Flowers: June-August
Growth Duration: Perennial
Glyceria ×occidentalis – northwestern mannagrass
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Idaho.
Habitat: Lakes, ponds, streams, and marshy areas.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Idaho.
Habitat: Lakes, ponds, streams, and marshy areas.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
Glyceria striata – fowl mannagrass
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Wet places, bogs, and mountain meadows.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Wet places, bogs, and mountain meadows.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
