Schoenus nigricans

Tracheophyta MagnoliopsidaCyperaceaeSchoenusSchoenus nigricans


A tussock-forming perennial of calcareous and other base-rich fens (especially near springs), and of peaty flushes, marshes, bogs, dune-slacks, sea-cliff flushes, and the upper fringes of saltmarshes where there is base-rich flushing. In W. Ireland, it is frequent on acid blanket-bog. Generally lowland, but reaching 550 m in the Mourne Mountains (Co. Down).



World Distribution

Eurosiberian Southern-temperate element; also in N. America.

Broad Habitats

Fen, marsh and swamp (not wooded)

Light (Ellenberg): 8

Moisture (Ellenberg): 8

Reaction (Ellenberg): 7

Nitrogen (Ellenberg): 2


Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 3.9

July Mean Temperature (Celsius): 13.9

Annual Precipitation (mm): 1261

Life form information

Height (cm): 75

Perennation - primary


Life Form - primary




Clonality - primary

Tussock-forming graminoid, may slowly spread

Distribution information

Count of 10km squares in Great Britain: 763

Count of 10km squares in Ireland: 484

Count of 10km squares in the Channel Isles: 4

Atlas Change Index: -0.53

Weighted Changed Factor: 16

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