17a. Eleocharis compressa Sullivant var. compressa
Flat-stemmed spike-rush, éléocharide comprimée
Culms compressed, 2–5 times as wide as thick, 0.5–1.8 mm wide. Distal leaf sheaths without tooth. 2n = 24.
Fruiting late spring–winter. Damp soil to shallow water of seasonally wet seeps and depressions in calcareous grasslands, meadows, limestone and dolomite barrens, glades, fens, ditches, waste places; 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.