Vegetative parts: plants clumped or tufted, 1–2.5 m tall, basal diameter 0.5–2 m, crown diameter 0.5–2 m, with rhizomes. Rhizome spreading, unbranched or sparsely branched, culms evenly spaced, 15–18 mm in diam., culms 20–30 mm apart. Fertile culms branching, compressed near apex. Margins of compressed culms ribbed distinct rib absent. Fertile culms finely rugulose or rugose, olivaceous, 1–2.5 m tall, diameter at base 3.5–7.5 mm, diameter at apex 0.3–0.5 mm. Branch axil indumentum absent or present. Sheaths persistent, with no abscission line, closely convoluted, 8–45 mm long, greenish, similar to the culm, apical margins narrowly membranous, hyaline shoulders membranous margins continuing behind awn, hyaline shoulder 0.1 of sheath body length, apex, excluding the membranous lobes, acute or rounded. Sheath-mucro penicellate or awl- or needleshaped, straight and erect, 1.5–3 mm long. Males: male inflorescence with 2–5 spikelets or 6–10 spikelets, racemose (rarely one or two axillary branches), 12–90 mm long, 5–10 mm wide. Male inflorescence spathes persistent, shorter than spikelets or as tall as spikelets, coriaceous or cartilaginous, similar to the sheaths, after spikelets fall apart often persisting. Male flowers in spikelets. Male spikelets erect on stiff pedicels or sessile, oblong or ovate, apex rounded or obtuse, 5–8 mm, 2–6 mm, with 4–6 flowers, pedicels absent ie spikelets sessile. Male bracts taller than flowers, 3–5 mm long, ovate, acuminate, cartilaginous, bract upper margin like body of bract, bract awn minute or absent, appear to drop off soon after flowering is finished. The spikelets also have a well-developed two-keeled prophyll. Male flower 2.2–3 mm long. Male tepals sepals and petals the same rigidity, chartaceous or cartilaginous, linear, inner and outer tepals the same length. Male outer lateral tepals conduplicate, keel sparsely villous. Anthers 1.2–1.5 mm long, exserted from the flowers. Pistillode present. Females: female inflorescence with 1 spikelet. Female spathes shorter than the spikelets, persistent, coriaceous or cartilaginous. Female spikelet sessile, oblong, apex rounded, 10–25 mm long, with 5–15 flowers, with 0–1 sterile bracts. Female bracts at least twice as long as flowers, erect or reflexed, 6–15 mm long, oblong or ovate, acute or acuminate, cartilaginous, apical margin like rest of bract, same as body of bract, awn minute or absent or less than half as long as the bract body. Female flower 2.1–2.5 mm long, without a fleshy pedicel. Female tepals chartaceous or cartilaginous, keels of lateral sepals densely villous, midrib flush with the tepal body, apices rounded or obtuse, inner and outer whorls the same length. Female outer lateral tepals conduplicate, 2.2–2.5 mm long. Female odd outer tepal oblong or obovate (but obscurely so), 2.2–2.5 mm long. Female inner tepals oblong, 2.2–2.5 mm long. Staminodes present. Styles feathery, white, 3. Style bases free. Ovary with 2 locules, dehiscent. Fruit: seed 1.4 mm long, 1.3 mm in diameter, shape in side view round, shape in diameter round in cross section, white, brittle, white ornamentation.