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

JNCC Designations