Potamogeton obtusifolius

Tracheophyta MagnoliopsidaPotamogetonaceaePotamogetonPotamogeton obtusifolius


A rhizomatous perennial characteristically found in mesotrophic or meso-eutrophic, acidic or neutral standing waters in lakes, ponds and flooded mineral workings, or in canals and the backwaters of rivers. It may, however, occupy a broader habitat range in areas such as N. Ireland where it is especially frequent. It fruits freely, and also reproduces by turions. 0-480 m (Angle Tarn, Patterdale, Westmorland).



World Distribution

Circumpolar Boreo-temperate element, with a disjunct distribution.

Broad Habitats

Standing water and canals

Light (Ellenberg): 7

Moisture (Ellenberg): 12

Reaction (Ellenberg): 6

Nitrogen (Ellenberg): 5


Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 3.4

July Mean Temperature (Celsius): 14.7

Annual Precipitation (mm): 994

Length: 190

Perennation - primary


Life Form - primary

Perennial hydrophyte (perennial water plant)



Clonality - primary

Detaching ramets above ground (often axillary)

Count of 10km squares in Great Britain: 601

Count of 10km squares in Ireland: 155

Count of 10km squares in the Channel Isles: 0

Atlas Change Index: 0.96

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.