Lemna trisulca

Tracheophyta MagnoliopsidaLemnaceaeLemnaLemna trisulca


The only submerged species of Lemna in our area, L. trisulca is frequent in mesotrophic to eutrophic, still to slowly flowing waters where low nutrient levels or exposure prevent the development of a dense blanket of floating Lemna species. Reproduction is by vegetative budding; flowering is very rare. Generally lowland, but reaching 340 m at Kingside Loch (Selkirks.).



World Distribution

Circumpolar Temperate element.

Broad Habitats

Light (Ellenberg): 7

Moisture (Ellenberg): 12

Reaction (Ellenberg): 7

Nitrogen (Ellenberg): 5


Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 3.8

July Mean Temperature (Celsius): 15.5

Annual Precipitation (mm): 832

Length: 1

Perennation - primary


Life Form - primary

Perennial hydrophyte (perennial water plant)



Clonality - primary

Fragmenting as part of normal growth

Distribution information

Count of 10km squares in Great Britain: 1156

Count of 10km squares in Ireland: 369

Count of 10km squares in the Channel Isles: 8

Atlas Change Index: -0.21

Weighted Changed Factor: -15

Weighted Change Factor Confidence (90%)


Distribution information

JNCC Designations


PLANTATT - Attributes of British and Irish plants. (.zip 1455KB) This dataset was compiled and published in 2004, and last updated in November 2008. Download includes an Excel spreadsheet of the attributes, and a PDF explaining the background and nomenclature. Note that the PDF version is the booklet as published, whereas the Excel spreadsheet incorporates subsequent corrections. A hardcopy can be purchased from the Centre for Ecology and Hydrology.

Atlas text references

Atlas (344a)
Hultén E, Fries M
1986.  Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
Preston CD, Croft JM
1997.  Aquatic plants in Britain and Ireland.