Eleocharis compressa var. compressa
Culms compressed, 2–5 times as wide as thick, 0.5–1.8 mm wide. Distal leaf-sheaths without tooth. 2n = 24.
Phenology: Fruiting late spring–winter.
Habitat: Damp soil to shallow water of seasonally wet seeps and depressions in calcareous grasslands, meadows, limestone and dolomite barrens, glades, fens, ditches, waste places
Elevation: 0–2100 m
Ont., Que., Ala., Ark., Colo., D.C., Ill., Ind., Iowa, Kans., Ky., Md., Mich., Minn., Miss., Mo., Nebr., N.Y., Ohio, Pa., S.Dak., Tenn., Va., W.Va., Wis.