Zannichellia palustris

Tracheophyta MagnoliopsidaZannichelliaceaeZannichelliaZannichellia palustris


This submerged, perennial aquatic grows in a range of shallow-water habitats. The most characteristic include clear chalk streams, eutrophic lakes and ponds, and brackish lagoons, ponds and ditches. It is a frequent colonist of disused mineral workings. 0-380 m (Llynheilyn, Rads.).



World Distribution

Circumpolar Southern-temperate element.

Broad Habitats

Light (Ellenberg): 7

Moisture (Ellenberg): 12

Reaction (Ellenberg): 8

Nitrogen (Ellenberg): 7


Salt Tolerance (Ellenberg): 2

January Mean Temperature (Celsius): 3.8

July Mean Temperature (Celsius): 15.5

Annual Precipitation (mm): 820

Length: 50

Perennation - primary


Life Form - primary

Perennial hydrophyte (perennial water plant)



Clonality - primary

Irregularly fragmenting (mainly water plants)

Clonality - secondary

Rhizome far-creeping

Distribution information

Count of 10km squares in Great Britain: 1196

Count of 10km squares in Ireland: 206

Count of 10km squares in the Channel Isles: 5

Atlas Change Index: 0.17

Weighted Changed Factor: -10

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.

Atlas text references

Atlas (310d)
Hultén E, Fries M
1986.  Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
Preston CD, Croft JM
1997.  Aquatic plants in Britain and Ireland.