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Herbs, annual, cespitose. Culms trigonous, 2–30 cm × 0.6–1.1 mm, glabrous. Leaves flat, 4–10 cm × 2–4 mm. Inflorescences: rays 1–3, 0.2–1.5 cm; 2d order rays present in robust plants, to 5 mm; bracts 2–3, longest erect, others spreading, 1–20 cm × 1.5–3 mm. Spikelets 3–12, narrowly ellipsoid, flattened, 3–7 × 0.9–1.2 mm; floral scales 8–12(–16), laterally purplish brown, medially greenish yellow, 3-ribbed medially, orbiculate, 0.9–1.1 × 1 mm, apex mucronate. Flowers: stamen 1; anthers ellipsoid, 0.2 mm, connective not prolonged; styles 0.3–0.4 mm; stigmas 0.3 mm. Achenes light brown, ellipsoid, 0.7–0.9 × 0.4 mm, base barely stipelike to narrowly cuneate, apex acute, surfaces glabrous.
Tufted annual 1–4 dm; lvs 1–4 mm wide; bracts 2–5, surpassing the infl; rays few, 1–3 cm; spikelets 3–6 mm, 10–20(–40)-fld; rachilla not winged; scales ovate, 0.9–1.5 mm, with reddish-brown sides, keeled, shortly mucronate; stamens 2; achenes whitish, trigonous, 1 mm; 2n=72. Native of Eurasia, intr. at scattered stations in the e. part of our range.
