Poaceae
Reed mannagrass
Glyceria maxima
- Family
- Poaceae
- Genus
- Glyceria
Pet and kid safety: not checked yet. Check pet-safe plants
Is yours looking unwell? Scan your plant — free
Common names
By language (22)
- Chinese
- 水甜茅
- Czech
- Zblochan vodní
- Danish
- Høj Sødgræs
- Dutch
- Liesgras
- English
- Reed mannagrass, Reed sweet-grass, Great manna grass
- Estonian
- Suur parthein
- Finnish
- Isosorsimo
- French
- Glycérie aquatique
- German
- Wasser-Schwaden, Grosses Süeegras, Großer Schwaden, Großer Wasserschwaden, Riesen-Schwaden, Wasserschwaden
- hsb
- Wulka porčizna, Porč
- Hungarian
- Vízi harmatkása
- Icelandic
- Fenjapuntur
- Irish
- Milseán mór
- Latvian
- Dižā ūdenszāle
- Lithuanian
- Vandeninė monažolė
- Norwegian Bokmål
- Kjempesøtgras, Kjempesøtgress
- Polish
- Manna mielec, Manna wodna
- Romanian
- Mană de apă
- sah
- Өлөҥ
- Swedish
- Jättegröe, Kasevija
- Ukrainian
- Лепешняк великий
- Welsh
- Melyswellt y gamlas
Synonyms
- Catabrosa hydrophila Link
- Exydra aquatica (L.) Endl.
- Festuca aquatica (L.) Mutel
- Glyceria altissima Garcke
- Glyceria aquatica (L.) Wahlb.
- Glyceria aquatica subsp. densiflora Waisb.
- Glyceria aquatica subsp. umbrosa (Junge) Waisb.
- Glyceria aquatica var. flavescens Peterm.
- Glyceria aquatica var. laxa Hegi
- Glyceria aquatica var. pallens Klett & Richt.
- Glyceria aquatica var. scabra Peterm.
- Glyceria maxima f. acuta (Peterm.) Soó
- Glyceria maxima f. scabra (Peterm.) Soó
- Glyceria maxima subsp. micrantha H.Scholz
- Glyceria spectabilis Mert. & W.D.J.Koch
- Glyceria spectabilis f. acuta Peterm.
- Glyceria spectabilis var. acuta Peterm.
- Glyceria spectabilis var. laevis Peterm.
- Glyceria spectabilis var. scabra (Peterm.) Peterm.
- Glyceria spectabilis var. vivipara Mert. & W.D.J.Koch
- Heleochloa aquatica (L.) Drejer
- Heleochloa aquatica (L.) Fr.
- Hydrochloa aquatica (L.) Hartm.
- Hydropoa spectabilis (Mert. & W.D.J.Koch) Dumort.
- Melica aquatica (L.) Weber ex P.Beauv.
- Melica aquatica Weber. ex P.Beauv.
- Molinia maxima Hartm.
- Panicularia aquatica (L.) Kuntze
- Poa aquatica L.
- Poa aquatica var. vivipara Gray
Flowers
- In flower
- February to March, June to July (from 48 flowering iNaturalist observations worldwide)
Characteristics
- Growth habit
- Graminoid
- Lifespan
- Perennial
- In the US and Canada
- Canada: introduced, Lower 48 states: introduced
Photos
FlowerPhoto: Harry Rose, CC BY 4.0, from iNaturalist 
FlowerPhoto: Florencia Grattarola, CC BY 4.0, from iNaturalist 
FlowerPhoto: Alice Shanks, CC BY 4.0, from iNaturalist 
FlowerPhoto: Harry Rose, CC BY 4.0, from iNaturalist 
Photo: Rasbak, CC BY-SA 3.0, from Wikimedia Commons 
Photo: Krendeleva Anna, CC BY 4.0, from iNaturalist 
Photo: Matti Virtala, CC0, from Wikimedia Commons 
Photo: Aleksei Baushev, CC BY 4.0, from iNaturalist 
Photo: Lazaregagnidze, CC BY-SA 4.0, from Wikimedia Commons 
Photo: Aleksei Baushev, CC BY 4.0, from iNaturalist 
Photo: Harry Rose from South West Rocks, Australia, CC BY 2.0, from Wikimedia Commons 
Photo: Karen Fry, CC BY 4.0, from iNaturalist
More in Glyceria
- Water mannagrassGlyceria fluitansPoaceae
- Glyceria lithuanicaPoaceae
- Plicate sweet-grassGlyceria notataPoaceae
- Waxy mannagrassGlyceria declinataPoaceae
- Fowl manna grassGlyceria striataPoaceae
- Rattlesnake manna grassGlyceria canadensisPoaceae
- Glyceria nemoralisPoaceae
- American mannagrassGlyceria grandisPoaceae
- Creeping mannagrassGlyceria acutifloraPoaceae
- Northern manna grassGlyceria borealisPoaceae
- Glyceria ischyroneuraPoaceae
- Davy mannagrassGlyceria leptostachyaPoaceae
Sources: classification, synonyms from World Flora Online Plant List (2026-06, CC0 1.0); common names, popularity from Wikidata (2026-10-26, CC0 1.0); common names, US characteristics from USDA PLANTS Database (2025-05-29, CC0 1.0). About our plant data.