Carex atlantica subsp. capillacea
Contr. Univ. Michigan Herb. 14: 191. 1980.
Culms usually 10–60 cm. Leaves 0.4–1.55 mm wide, widest (0.65–) 0.8–1.6 mm wide. Inflorescences usually 0.8–2 cm; spikes 2–5. Perigynia 1.9–3 × 1.3–2 mm, (1.15–) 1.3–1.7 (–1.9) times as long as wide; beak 0.45–0.95 mm.
Phenology: Fruiting late spring–early summer.
Habitat: Bogs, acidic coniferous swamps, wet, acidic soils
Elevation: 0–300 m
N.S., Ont., Que., Ala., Ark., Conn., Del., D.C., Fla., Ga., Ill., Ind., Ky., La., Maine, Md., Mass., Mich., Miss., N.H., N.J., N.Y., N.C., Ohio, Pa., R.I., S.C., Tenn., Tex., Vt., Va.
The two Carex atlantica subspecies are quite distinct over most of their ranges, but in the south, especially in the Gulf States, intermediates and specimens showing some characteristics of one subspecies and some of the other are occasional.