Carex emmonsii Dewey ex Torrey, Ann. Lyceum Nat. Hist. New York 3: 411. 1836, based on C. davisii Dewey, Amer. J. Sci. Arts 10: 279. 1826, not Schweinitz & Torrey 1825

Rhizomes ascending to erect, 0–5(–20) mm. Staminate spikes 5–8.5 × 0.8–1.3 mm; staminate scales from median portion of spike 2.8–4 × 0.6–1.9 mm, midrib prominent, usually elevated and extending to apex of scale, usually with small teeth (15X). Perigynia 2.3–3.3 × 0.8–1.2 mm; beak with apical teeth 0.1–0.3 mm. 2n = 40.

Fruiting early May–mid Jun. Mesic to rich moist soils on slopes in partial shade of hardwoods, occasionally in drier sites of sandy loam under mixed hardwood-pine, in richer soils than other varieties; 50–900 m; N.B., N.S., Ont., Que.; Ark., Conn., Del., Fla., Ga., Ill., Ind., Ky., Maine, Md., Mass., Mich., Mo., N.H., N.J., N.Y., N.C., Ohio, Pa., R.I., S.C., Tenn., Vt., Va., W.Va., Wis.