Groenlandia densa

Tracheophyta MagnoliopsidaPotamogetonaceaeGroenlandiaGroenlandia densa


A perennial herb of shallow, clear, base-rich water which may grow in lakes and rivers, but is more frequent in smaller waters such as streams, canals, ditches and ponds. It rarely colonises newly available habitats, although it is sometimes found as an introduction in ponds. Generally lowland, but reaching 380 m at Malham Tarn (Mid-W. Yorks.).



World Distribution

European Temperate element.

Broad Habitats

Light (Ellenberg): 8

Moisture (Ellenberg): 12

Reaction (Ellenberg): 8

Nitrogen (Ellenberg): 5


Salt Tolerance (Ellenberg): 1

January Mean Temperature (Celsius): 3.7

July Mean Temperature (Celsius): 15.9

Annual Precipitation (mm): 750

Length: 65

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: 590

Count of 10km squares in Ireland: 42

Count of 10km squares in the Channel Isles: 0

Atlas Change Index: -1.23

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.