C. nigra occurs in a wide range of wet habitats, avoiding only those which are extremely basic or acidic. It is found in fens, fen-meadows, bogs, streamsides and flushes, wet grassland and dune-slacks. This sedge is morphologically very variable: tussock forms may occur in stagnant, acidic sites, and rhizomatous tufted variants are known from calcareous mires. 0-1005 m (Beinn Heasgarnich, Mid Perth).
Mapped as `all records` in the 1962 Atlas, the distribution of C. nigra seems stable other than in S.E. England, where it is has declined because of drainage.
Eurosiberian Boreo-temperate element; also in N. America.
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
1988. Comparative Plant Ecology.
1986. Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
1982. Sedges of the British Isles. Botanical Society of the British Isles Handbook no. 1, edn 2.
1965. Vergleichende Chorologie der zentraleuropäischen Flora. Volume 1. 2 vols.