Densely caespitose; rhizome short. Stem erect, compressed, acute-edged, 1.3–3.0 mm wide. Leaves double-edged-compressed; sheaths with distinct, broad membranous margins; auricles c. 0.5–1.0 mm long. Lower bract 3–14 cm long. Inflorescence of 10–25 (–40) usually (3–) 5–20 (–25)-flowered heads. Tepals (2.2–) 2.5–3.0 (–3.4) mm long, often slightly recurved at apex. Anthers 0.5–0.7 mm long; filaments c. 1.0 mm long. Capsule narrowly prismatic-trigonous to almost cylindric, gradually narrowing in an acute apex, rarely more abruptly narrowed at the very apex with c. 0.3 mm rostrum, c. 3.5–4.5 mm long, distinctly exceeding perianth.