Carex nigromarginata, also known as black edge sedge, is a North American sedge which grows on acid soils in dry woodland, thickets, and roadside, and similar ruderal habitats in partial shade or in full sun, often near streams at elevations of . The plants grow in dense clumps, often forming circular patterns on forest floors or roadsides. 2n = 36.Ball, P. W. 2002. Carex nigromarginata. In: Flora of North America Editorial Committee, eds. 1993+ (vol. 23, 2002). Flora of North America North of Mexico. 16+ vols. New York and Oxford. Vol. 23, pp. 534, 541-543.
Range Ontario, west to Illinois, Missouri, and Arkansas, south from Mississippi to South Carolina and northeast to Rhode Island, Connecticut and Massachusetts.
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