Potamogeton pusillus

Tracheophyta MagnoliopsidaPotamogetonaceaePotamogetonPotamogeton pusillus


A rhizomatous perennial found in standing or slowly flowing water in sheltered lakes and reservoirs, ponds, rivers, canals, ditches and flooded mineral workings. It favours mesotrophic to eutrophic water and tolerates slightly brackish conditions. 0-320 m (Stony Middleton, Derbys.).



World Distribution

Circumpolar Southern-temperate element.

© K.J. Walker, BSBI

Broad Habitats

Standing water and canals

Light (Ellenberg): 7

Moisture (Ellenberg): 12

Reaction (Ellenberg): 7

Nitrogen (Ellenberg): 6


Salt Tolerance (Ellenberg): 1

January Mean Temperature (Celsius): 3.6

July Mean Temperature (Celsius): 15.1

Annual Precipitation (mm): 877

Length: 70

Perennation - primary


Life Form - primary

Perennial hydrophyte (perennial water plant)



Clonality - primary

Detaching ramets above ground (often axillary)

Comment on Clonality

Turions either axillary or (in autumn) terminal

Distribution information

Count of 10km squares in Great Britain: 806

Count of 10km squares in Ireland: 146

Count of 10km squares in the Channel Isles: 1

Atlas Change Index: 0.77

Weighted Changed Factor: 46

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.