Rhizomes coarse, 1.8–2.6 mm thick, typically with long, unbranched segments from which shoots arise singly every few nodes. Culms sharply trigonous, 8–40 cm, scabrous-angled distally. Leaves: basal sheaths dark brown; sheaths with hyaline inner band, apex not prolonged, glabrous; ligules 0–1.2 mm; blades 1.7–3.8 mm wide. Inflorescences 1.2–2.5 cm; spikes 3–12, usually unisexual; staminate spikes lanceoloid; pistillate spikes compact, ovoid. Pistillate scales dark reddish brown to nearly purple-black, with broad hyaline margins, ovate, apex acute to acuminate-awned, shiny. Anthers 1.7–3.1 mm, apiculus bristly hairy (30X). Perigynia dark brown to nearly black at maturity, essentially veinless adaxially, usually ± stipitate, ovate, plano-convex, 3.1–4.2 × 1.3–1.8 mm, dull; beak 0.7–1.5 mm, apex ± hyaline, obscurely bidentate.
Home