Plants 15-35(-50) cm tall. Stem erect, branched mostly from base; lowest branches ascending, upper ones obliquely spreading. Leaves linear, 2.5-4 cm × 3-5 mm, 1-veined, base attenuate, apex acuminate, mucronate. Spikelike inflorescence terete or clavate, straight or slightly curved, crowded, usually 3-5(-7) × ca. 0.8 cm; bracts lanceolate to ovate, 0.5-1.5 cm × 3-4 mm, 1-3-veined, base rounded, margin membranous, apex acute or acuminate. Perianth segments 1-3, upper one broadly elliptic or suborbicular, apex irregularly denticulate, lower segments smaller or not developed. Stamens 1-5. Utricle broadly elliptic or obovate-oblong, 3.5-4(-4.5) × 2.8-3.5 mm, few tuberculate or dark punctate abaxially, hairy or sometimes glabrous, base truncate or caudate, apex distinctly emarginate; wing broad, 1/2-2/3 as wide as body, margin irregularly denticulate; beak apex 1/4-1/3 as long as beak. Fl. and fr. Jul-Sep.
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An annual herb. It grows 15-50 cm high. The leaves are narrow and without leaf stalks. They are 5 cm long by 2-4 mm wide. The flowers are small and green. They are in the axils of bracts. They are crowded into spikes 5-6 cm long and 1 cm wide.
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