Vegetative parts: plants clumped, 0.6-1.5 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, 6-12 mm in diam., culms 2-15 mm apart. Fertile culms unbranched, solid or with a small central cavity, smooth, green, 0.6-2 m tall, diameter at base 3-5 mm, diameter at apex 1.5-3 mm. Sheaths closely convoluted, 15-45 mm long, margins ciliate, brown to grey in the upper portions, culm-coloured to brown in the lower portions., upper 1/3 in colour and texture abruptly different from the base, and soon decaying, apical margins narrowly membranous, hyaline shoulders absent, apex, excluding the membranous lobes, rounded or truncate. Sheath-mucro absent, Lower portion persisting, upper half soon decaying. Males: male inflorescence with 11-20 spikelets or 21-50 spikelets, paniculate, 55-100 mm long, 10-35 mm wide. Male inflorescence spathes caducous, taller than spikelets, cartilaginous, dark and glossy; sides curling in at the apex, into a stiff point. Male flowers in spikelets or not aggregated into spikelets. Male spikelets erect on stiff pedicels or sessile, undifferentiated, apex undifferentiated, 10-15 mm, 5-7 mm, with 10-30 flowers, pedicels absent ie spikelets sessile or shorter than the spikelets, terete or angular. Male bracts taller than flowers, 5-10 mm long, linear, acute or acuminate, membranous, bract upper margin like body of bract, bract awn minute or absent, straw coloured. Male flower 4-6 mm long. Male tepals sepals and petals the same rigidity or sepals more rigid than petals, membranous, petals membranous, linear, inner tepals shorter than outer tepals. Male outer lateral tepals as other tepals, glabrous. Anthers 1.5-2 mm long, included in the flowers. Females: female inflorescence linear, 55-120 mm long, 5-20 mm wide, with 2-5 spikelets. Female spathes longer than the spikelets, obscuring spikelet, persistent, cartilaginous. Female spathellae inconspicuous or absent. Female spikelet sessile, obovate, apex truncate or rounded, 15-35 mm long, with 1-2 flowers, with 5-15 sterile bracts. Female bracts taller than flowers, erect, 13-30 mm long, linear or ovate, acuminate, chartaceous or cartilaginous, apical margin membranous, paler than body of bract or same as body of bract, margins entire, awn minute or absent. Female flower 1-3 mm long, with a fleshy pedicel, six tepals. Female tepals membranous, glabrous and smooth, smaller than nut and not obscuring the nut surface, midrib flush with the tepal body, margins entire, apices rounded or obtuse, inner and outer whorls the same length or inner whorl shorter than outer. Female outer lateral tepals like other tepals, hidden by bracts, or bracts are shorter than flowers, 1-4 mm long. Female odd outer tepal oblong or square, 1-4 mm long. Female inner tepals oblong or square, 1-3 mm long. Styles plumose, 2. Style bases free. Ovary with 1 locule, indehiscent. Fruit: indehiscent fruits with a hard woody ovary wall. Perianth presence on fruits persistent, membranous, shorter than nut. Nut apex smooth, without a distinct cap, wall smooth, 6-8 mm long, 4-5 mm diam., shape in side view oblong, shape in top view round in cross section, brown or black. Elaiosome present (fluted), white, 2-3 mm long, less than half as long as nut.