Glyceria
Glyceria is a widespread genus of grass family common across Eurasia, Australia, North Africa, and the Americas.
Glyceria is known commonly as mannagrass in the United States, or, in the UK, sweet-grass. These are perennial rhizomatous grasses found in wet areas in temperate regions worldwide. The base of the grass grows along the ground and may root at several places. Then it grows erect and bears leaf blades which may be flat or folded. The panicle inflorescences nod when heavy. Some mannagrasses are considered weeds while others are endangered in their native habitats.
; SpeciesGlyceria acutiflora - creeping mannagrass - China, Korea, Japan, northeastern + east-central USAGlyceria alnasteretum - Alaska, Russian Far East, Japan, KoreaGlyceria × amurensis - Amur OblastGlyceria arkansana - Arkansas mannagrass - south-central USAGlyceria arundinacea - Eurasia from Hungary to KoreaGlyceria australis - Australian sweetgrass - AustraliaGlyceria borealis - northern mannagrass - western, north-central, + northeastern USA incl Alaska; Canada incl Yukon + Northwest Territories; Mexico Glyceria canadensis - rattlesnake mannagrass, Canadian mannagrass - Canada; USA Glyceria caspia - CaucasusGlyceria chinensis - China Glyceria colombiana - ColombiaGlyceria declinata - waxy mannagrass, low glyceria, small sweet-grass - Europe, Morocco, Madeira, Azores, Canary Islands; naturalized in scattered locales in North America and New ZealandGlyceria depauperata - Japan, Kuril IslandsGlyceria × digenea - France, Czech RepublicGlyceria drummondii - Western AustraliaGlyceria elata - tall mannagrass - western USA, British Columbia, AlbertaGlyceria fluitans - water mannagrass, floating sweet-grass - Morocco; Eurasia from Iceland + Portugal to TurkmenistanGlyceria × gatineauensis - Québec, New York, West VirginiaGlyceria grandis - American mannagrass - USA incl Alaska; Canada incl Yukon + Northwest TerritoriesGlyceria insularis - Tristan da CunhaGlyceria ischyroneura - Japan, Kuril Islands, KoreaGlyceria latispicea - New South WalesGlyceria leptolepis - Russian Far East, China incl Taiwan, Korea, JapanGlyceria leptorhiza - Korea, Honshu, Hokkaido, Heilongjiang, Amur Oblast, Khabarovsk, Zabaykalsky KraiGlyceria leptostachya - davy mannagrass, narrow mannagrass - California, Oregon, Washington, British Columbia, AlaskaGlyceria lithuanica - Lithuanian mannagrass - northern Eurasia from Norway to KoreaGlyceria maxima - reed mannagrass, English watergrass, reed sweet-grass - Eurasia from Ireland to XinjiangGlyceria melicaria - melic mannagrass - eastern North AmericaGlyceria multiflora - Chile, Argentina, Uruguay, Rio Grande do Sul, Santa CatarinaGlyceria nemoralis - Caucasus, central + eastern EuropeGlyceria notata - marked glyceria, plicate sweet-grass - Eurasia + North Africa from Denmark + Morocco to XinjiangGlyceria nubigena - Great Smoky Mountain mannagrass - Great Smoky Mountains of North Carolina + TennesseeGlyceria obtusa - Atlantic mannagrass - eastern North AmericaGlyceria occidentalis - northwestern mannagrass - California, Oregon, Washington, British Columbia, Idaho, NevadaGlyceria × ottawensis - OntarioGlyceria × pedicellata - northern + central EuropeGlyceria pulchella - MacKenzie Valley mannagrass, beautiful glyceria - Alaska, western Canada incl Yukon + Northwest TerritoriesGlyceria saltensis - Salta Province in ArgentinaGlyceria septentrionalis - floating mannagrass - eastern USA, eastern Canada, northeastern MexicoGlyceria spicata - India, MediterraneanGlyceria spiculosa - eastern Russia, northern China, KoreaGlyceria striata - fowl mannagrass, ridged glyceria - Canada incl Arctic Territories, USA incl Alaska, Mexico, GuatemalaGlyceria × tokitana Masamura - JapanGlyceria tonglensis C.B.Clarke - Himalayas, China incl Tibet
; formerly included
Numerous species now considered better suited to other genera: ''Arctophila Catabrosa Colpodium Dryopoa Eragrostis Hydrocotyle Melica Phippsia Poa Puccinellia Scolochloa Torreyochloa Triplasis''