Carex prasina Wahlenb.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Tufted, 3–8 dm, brown or greenish at base; main lvs 3–5 mm wide; sheaths glabrous; terminal spike staminate or with a few apical perigynia; pistillate spikes 2–4, widely separated, cylindric, 2–5 cm, 5 mm thick, curved or nodding, the lower on long peduncles, the upper on much shorter ones; upper bract sheathless or nearly so; pistillate scales ovate to obovate-oblong, shorter than the perigynia, mucronate or short-cuspidate; perigynia 2.9–4.2 mm, rhombic-ovoid, trigonous, sharply angled at the prominent lateral ribs, obtusely angled on the back, otherwise essentially nerveless, tapering to an acute, at first nearly flat, later trigonous beak; achene concavely trigonous. Moist or wet woods and streambanks; Que. and Me. to Mich., s. to S.C., Ga., and Ala.