Tufted, 1-8 dm; lvs flat, mostly 3-5.5 mm wide, the plants appearing leafier than no. 153 [Carex viridula Michx.]; terminal spike sessile or short-pedunculate, slender, staminate or with some distal perigynia, 6-24 mm; lateral spikes 2-5, pistillate, short and stout, 6-17 mm, all sessile or short-pedunculate and crowded at the summit, or 1 or 2 of the lower ±remote and more evidently pedunculate; bracts sheathless or nearly so (except those subtending any remote spikes), one or more of them with an elongate blade much surpassing the infl; pistillate scales strongly tinged with coppery brown, thus conspicuous in the spike; perigynia 3.7-6.2 mm, most of them spreading and evidently falcate-recurved, relatively slender and gradually tapering to the poorly defined, distally rough-margined beak, this 1.4-2.3 mm, set at a ±divergent angle to the body; perigynium-body strongly yellowish toward the base, usually more greenish (or eventually brownish) distally, prominently several-nerved on the upper surface, more obscurely so on the lower, achene hardly larger than in no. 153, a larger part of the perigynium thus empty; 2n=60, 64, 68, 70. Bogs and wet meadows in calcareous districts; circumboreal, s. in Amer. to N.J., Ind., Ida., and B.C. (C. laxior)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
A widespread species which is common throughout most of its range but rare and very local in Indiana. The two known localities for it in the state are: marly marsh on the Wolverton Estate, 7 miles southwest of South Bend, St. Joseph County, Deam nos. 54874 and 55079; and springy wooded bank of Flat Rock River, three-fourths of a mile above St. Paul, Decatur County, Mrs. C. C. Deam nos. 10766 and 13400.