Perennial; caespitose. Rhizomes short; pachymorph. Culms erect; 500-1200 cm long; 15-30 mm diam.; woody. Culm-internodes terete; thin-walled; 15-40 cm long; mid-green; distally pruinose. Lateral branches dendroid. Buds or branches present on lower quarter of culm. Culm-sheaths 8-16 cm long; 1.3 times as long as wide; green; glabrous; convex at apex; auriculate; with 10 mm high auricles. Culm-sheath ligule 0.5-1 mm high; entire. Culm-sheath blade triangular; 6-15 cm long; 50-80 mm wide; pubescent; acuminate. Leaf-sheaths pruinose; glabrous on surface, or pubescent. Leaf-sheath oral hairs setose; 10-16 mm long; pale. Leaf-sheath auricles falcate. Ligule an eciliate membrane; erose. Collar with external ligule. Leaf-blade base asymmetrical; with a brief petiole-like connection to sheath. Leaf-blades persistent, or deciduous at the ligule; lanceolate; 10-24 cm long; 25-40 mm wide. Leaf-blade midrib conspicuous. Leaf-blade venation with 16-20 secondary veins. Leaf-blade margins scabrous. Leaf-blade apex attenuate.