Carex nigra (L.) Reichard, 1778
Common names: Common Sedge, Black Sedge [En], Laîche noire, Laîche vulgaire [Fr], Zwarte zegge [Nl], Braun-Segge [De]

IUCN Status: LC (Least Concern)

Durbuy, LUXEMBOURG ● Belgium

Description: The stem is c 10-40 cm tall, three-cornered but edges rounded. The female spikes are c 10-20 mm long, strikingly black in flower, giving a black and green chequered effect when in fruit. The fruit is c 2.5-3 mm.
The leaves are often glaucous, sometimes on one side only.

Biology: Flowering from May to July.

Habitat: Wet grounds, in a wide variety of soil types.

Distribution: Europe, Western Asia, North America.

References:
West Highland Flora