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.
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Light (Ellenberg): 7
Moisture (Ellenberg): 8
Reaction (Ellenberg): 4
Nitrogen (Ellenberg): 2
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 3.5
July Mean Temperature (Celsius): 14.3
Annual Precipitation (mm): 1131
Height (cm): 70
Perennation - primary
Life Form - primary
Clonality - primary
Count of 10km squares in Great Britain: 2582
Count of 10km squares in Ireland: 876
Count of 10km squares in the Channel Isles: 5
Atlas Change Index: -0.01
Weighted Changed Factor: -11
Weighted Change Factor Confidence (90%)
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.