Vegetative parts: plants clumped or tufted, 0.2–0.6 m tall, basal diameter 0.2–0.3 m, crown diameter 0.2–0.3 m, with rhizomes. Rhizome spreading, unbranched or sparsely branched, culms evenly spaced, 6–8 mm in diam., culms 1 mm apart. Fertile culms unbranched, distinctly hollow (cavity varying in diameter: occasionally narrow), smooth, olivaceous (or brown), 0.2–0.6 m tall, diameter at base 1.5–3 mm, diameter at apex 1.5–2 mm. Sheaths closely convoluted, 15–30 mm long, as culm, apical margins coriaceous, like the rest of the body, hyaline shoulders absent, apex, excluding the membranous lobes, acute or obtuse or rounded. Sheath-mucro awl- or needleshaped (round in cross section), straight and erect, 4–10 mm long. Males: male inflorescence with 2–5 spikelets, racemose or paniculate, 10–50 mm long, 5–25 mm wide. Male inflorescence spathes caducous, shorter than spikelets or as tall as spikelets, cartilaginous, bearing distinct awn. Male flowers in spikelets. Male spikelets erect on stiff pedicels or sessile, elliptical or obovate, apex rounded or obtuse, 8–14 mm, 4–8 mm, with 30–65 flowers, pedicels absent ie spikelets sessile. Male bracts shorter than flowers or as tall as flowers, 3–6 mm long, elliptical or obovate or orbicular, rounded or obtuse, coriaceous or cartilaginous, bract upper margin like body of bract, bract awn minute or absent. Male flower 4–6 mm long. Male tepals sepals more rigid than petals, cartilaginous, petals membranous, oblong, inner tepals shorter than outer tepals or inner and outer tepals the same length. Male outer lateral tepals keeled or winged, glabrous. Anthers 2–3 mm long, exserted from the flowers. Females: female inflorescence linear, 20–45 mm long, 5–10 mm wide, with 1 spikelet or 2–5 spikelets. Female spathes shorter than the spikelets or as long as the spikelets or longer than the spikelets, not obscuring spikelet, persistent, cartilaginous. Female spikelet sessile, elliptical, apex acute, 8–20 mm long, with 1 flowers, with 5–8 sterile bracts. Female bracts taller than flowers, 7–15 mm long, ovate, acuminate, cartilaginous, apical margin like rest of bract, same as body of bract or darker than body of bract, awn less than half as long as the bract body. Female flower 5–7.5 mm long, without a fleshy pedicel. Female tepals cartilaginous or membranous, glabrous and smooth, midrib flush with the tepal body, apices acute, inner whorl shorter than outer. Female outer lateral tepals keeled or winged, wings entire, as wide as body or wider than body, 5–7.5 mm long. Female odd outer tepal oblong, 5–7 mm long. Female inner tepals ovate, 4–6 mm long. Staminodes absent. Styles 2. Style bases free. Ovary with 2 locules, indehiscent. Fruit: indehiscent fruits with a softer ovary wall. Nut wall smooth (?longitudinally wrinkled in herb specimens), (3.17–)3.78(–4.17) mm long, (1.5–)1.75(–1.83) mm diam., shape in side view elliptical, shape in top view elliptical in cross section, brown. Elaiosome absent.