Carex extensa

Tracheophyta MagnoliopsidaCyperaceaeCarexCarex extensa


A perennial herb, mainly confined to areas within reach of sea water or spray. It is found on muddy or sandy estuarine flats, at the uppermost levels of saltmarshes and the edges of brackish ditches, and on moist coastal rocks and low cliffs. It often grows with C. distans. Lowland.



World Distribution

European Southern-temperate element.

© G. Toone, IWNHAS

Broad Habitats

Littoral sediment (includes saltmarsh and saltmarsh pools)

Light (Ellenberg): 8

Moisture (Ellenberg): 7

Reaction (Ellenberg): 7

Nitrogen (Ellenberg): 5


Salt Tolerance (Ellenberg): 4

January Mean Temperature (Celsius): 4.5

July Mean Temperature (Celsius): 14.5

Annual Precipitation (mm): 1228

Life form information

Height (cm): 40

Perennation - primary


Life Form - primary




Clonality - primary

Tussock-forming graminoid, may slowly spread

Distribution information

Count of 10km squares in Great Britain: 440

Count of 10km squares in Ireland: 199

Count of 10km squares in the Channel Isles: 9

Atlas Change Index: -0.23

Weighted Changed Factor: 38

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.