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Information Plants densely cespitose. Culms 14–66 cm × 0.4–1 mm, smooth or scabriduous. Leaves: ligules 2.7–6.9 mm, 2.5–6 times as long as wide; blades 0.9–2.3 mm wide, widest blade 1.3–2(–2.3) mm wide. Inflorescences 16–58(–87) mm; proximal internode 5.7–32(–46) mm; proximal bracts 3.8–18(–34) mm, awn 0.4–15(–31) mm; spikes 4–6(–7), usually gynecandrous, sometimes pistillate; lateral spikes with 0–5 staminate and 8–18 pistillate flowers, longest proximal spike 5.5–9.8 × 4–5.6 mm; terminal spikes usually with 2–9 staminate and 4–18 pistillate flowers, 6.2–13 × 2.9–6.8 mm. Pistillate scales with margins ferruginous to castaneous or occasionally stramineous, 2–2.7 × 1.4–1.7 mm, apex acute. Staminate scales with margins ferruginous to castaneous or occasionally stramineous, 2.5–3.6 × 1.5–1.8 mm, apex acute. Anthers 1.1–1.4 mm. Perigynia ascending to spreading or occasionally recurved, green to brown and often ferruginous tinged apically, prominently to weakly 3–8-veined adaxially, 7–14-veined abaxially, ovate to narrowly ovate, 2.3–3.7 × 1.1–1.5 mm, 1.8–2.5(–3) times as long as wide, apex abruptly contracted or gradually tapering; beak 0.4–1.1(–1.3) mm, 0.15–0.33(–0.38) times as long as perigynia, margins sparsely serrulate or entire, apex entire or bidentulate with teeth to 0.1 mm, teeth 0–0.03 times as long as perigyina. Stigmas 0.8–1.4 mm. Achenes 1.3–2 × 0.9–1.2 mm, 1.4–1.7 times as long as wide. 2n = 56.

Information Plants densely to loosely cespitose, short to long rhizomatous. Culms brown at base. Leaves: basal sheaths fibrous; sheath fronts membranous; blades flat or V-shaped in cross section when young, glabrous. Inflorescences racemose with (2–)3–9 spikes; proximal bracts filiform or leaflike, sheathless; lateral spikes gynecandrous or pistillate, rarely staminate or androgynous, sessile, without prophylls; terminal spike usually gynecandrous. Proximal pistillate scales whitish to castaneous, hyaline margins and green, 1-veined center, apex acute or short-awned. Perigynia appressed-erect to spreading, occasionally recurved, veined or veinless on both faces, sessile, ovate to narrowly lanceolate, plano-convex, base cuneate to rounded, with spongy tissue, margins acutely angled, serrulate or entire distally, apex tapering or abruptly beaked, glabrous; beak 0.4–2.5(–2.8) mm, with abaxial suture usually nearly closed, margins entire or serrulate, apex entire to shortly bidentate. Stigmas 2. Achenes brown, sessile, biconvex or plano-convex, almost as large as bodies of perigynia, apex rounded; style deciduous, enlarged at base.