Plants 30-50 cm tall. Stem green, terete, sparsely hairy; branches slender, 10-25 cm. Leaves linear, 3-6 cm × 1-2 mm, 1-veined, base attenuate, margin entire, apex acuminate, mucronate. Spikelike inflorescence slender, terete, loose; bracts ovate to lanceolate, 1.5-3 cm × 1-1.5 mm, distinctly narrower than utricle, margin narrowly membranous. Perianth segments 1-3, upper one ovate, ca. 1.5 mm, membranous, base subrounded, apex rounded, irregularly denticulate, lower segments triangular, smaller. Stamens 3-5; filaments ca. 1.5 × as long as perianth segments. Utricle suborbicular, 4-5 × 3.5-4.5 mm, glabrous, base broadly cuneate or cordate, apex acute-emarginate; wing ca. 1 mm wide, margin irregularly denticulate; beak ca. 1.2 mm, apex ca. 1/4 as long as beak. Fl. and fr. Jul-Sep.
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