IUCN threat status:

Least Concern (LC)


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Glyceria fluitans

Glyceria fluitans (syns Festuca fluitans, Poa fluitans, Panicularia fluitans), known as Floating Sweet-grass[1] and Water Mannagrass, is a species of perennial grass in the genus Glyceria native to Europe, the Mediterranean region and Western Asia and occurring in wet areas such as ditches, riverbanks and ponds.

It has a creeping rootstock, a thick stem which rises to one metre. The leaves are long, narrow and pale green, rough on both sides, often folded at the keel which lies on the surface of the water.

Environmental Conservation[edit]

Glyceria fluitans is a component of Purple moor grass and rush pastures, a type of Biodiversity Action Plan habitat in the UK. This habitat occurs on poorly drained neutral and acidic soils of the lowlands and upland fringe. It is found in the South West of England, especially in Devon.


  1. ^ "BSBI List 2007" (xls). Botanical Society of Britain and Ireland. Retrieved 2014-10-17. 


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