Carex pseudocyperus


A pioneer species of wet mud and shallow water, found in a wide variety of habitats including the edges of lakes, ponds, reservoirs, rivers, ditches, canals and backwaters. It also occurs in reedswamps and tall-herb fens, and readily colonises sand-, gravel-, clay- and marl-pits. It is shade-tolerant, and is found in swampy Alnus woods and Salix carr. Reproduction is by seed. Lowland.



World Distribution

Eurosiberian Temperate element; also in E. Asia and N. America.

© K.J. Walker, BSBI

Broad Habitats

Fen, marsh and swamp (not wooded)

Light (Ellenberg): 7

Moisture (Ellenberg): 9

Reaction (Ellenberg): 6

Nitrogen (Ellenberg): 6


Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 3.8

July Mean Temperature (Celsius): 16

Annual Precipitation (mm): 754

Life form information

Height (cm): 90

Perennation - primary


Life Form - primary


Life Form - secondary

Perennial hydrophyte (perennial water plant)



Clonality - primary

Tussock-forming graminoid, may slowly spread

Distribution information

Count of 10km squares in Great Britain: 672

Count of 10km squares in Ireland: 72

Count of 10km squares in the Channel Isles: 3

Atlas Change Index: -0.27

Weighted Changed Factor: 43

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 (357a)
Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols,
Hultén, E., and Fries M.
, Königstein, (1986)

Sedges of the British Isles. Botanical Society of the British Isles Handbook no. 1, edn 2,
Jermy, A. C., Chater A. O., and David R. W.
, London, (1982)

Vergleichende Chorologie der zentraleuropäischen Flora. Volume 1. 2 vols,
Meusel, H., Jäger E., and Weinert E.
, Jena, (1965)

Aquatic plants in Britain and Ireland,
Preston, C. D., and Croft J. M.
, Colchester, (1997)