10 species
2 subspecies and varieties
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Glyceria borealissmall 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.
Origin: Native
Flowers: May - October
Glyceria canadensisCanada mannagrass, rattlesnake mannagrass
Origin: Introduced
var. canadensis – rattlesnake manna grass
Glyceria declinatalow glyceria
Origin: Introduced
Glyceria elatatall mannagrass
Distribution: 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
Glyceria fluitanswater mannagrass
Origin: Introduced
Glyceria grandisAmerican mannagrass
Distribution: Alaska south to Oregon, chiefly east of the Cascades; east to northeast United States and south to Virginia and New Mexico.
Habitat: Sloughs, damp meadows and stream borders.
Origin: Native
Flowers: Late June - Early August
var. grandis – reed mannagrass
Glyceria leptostachyaslender-spike manna grass
Origin: Native
Flowers: June - August
Glyceria maximatall mannagrass
Origin: Introduced
Glyceria ×occidentalisnorthwestern manna grass
Origin: Native
Flowers: May - June
Glyceria striatafowl manna grass
Distribution: Alaska south to northern California, east to Newfoundland and Florida.
Habitat: Wet places, bogs, and mountain meadows.
Origin: Native
Flowers: May - July