93b. Carex atlantica L. H. Bailey subsp. capillacea (L. H. Bailey) Reznicek, Contr. Univ. Michigan Herb. 14: 191. 1980.
Carex interior L. H. Bailey var. capillacea L. H. Bailey, Bull. Torrey Bot. Club 20: 426. 1893; C. howei Mackenzie; C. mohriana Mackenzie
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.
Fruiting late spring–early summer. Bogs, acidic coniferous swamps, wet, acidic soils; 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.