Potamogeton natans

Tracheophyta MagnoliopsidaPotamogetonaceaePotamogetonPotamogeton natans


This rhizomatous perennial herb is frequent as a floating-leaved aquatic in still or slowly flowing waters, and more rarely found as plants with submerged phyllodes in more rapid streams and rivers. It has a very wide ecological tolerance, growing in oligotrophic to eutrophic and base-poor to base-rich water over a wide range of substrates. Although it may be found in shallow swamps, or in water over 5 m deep, it is most frequent at moderate depths of 1-2 metres. 0-760 m (below Stob Ban, Westerness).



World Distribution

Circumpolar Boreo-temperate element.

© P. Shannon

Broad Habitats

Light (Ellenberg): 7

Moisture (Ellenberg): 11

Reaction (Ellenberg): 6

Nitrogen (Ellenberg): 4

Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 3.5

July Mean Temperature (Celsius): 14.5

Annual Precipitation (mm): 1091

Length: 100

Perennation - primary


Life Form - primary

Perennial hydrophyte (perennial water plant)



Clonality - primary

Irregularly fragmenting (mainly water plants)

Clonality - secondary

Rhizome far-creeping

Count of 10km squares in Great Britain: 2340

Count of 10km squares in Ireland: 648

Count of 10km squares in the Channel Isles: 6

Weighted Changed Factor: -16

Weighted Change Factor Confidence (90%)


JNCC Designations