Perennial. Culms erect; 150-250 cm long; 10 mm diam.; woody; without nodal roots. Culm-internodes terete; 6-7 cm long; distally pruinose and pubescent. Culm-nodes flush with internodes; without obvious supra-nodal ridge. Lateral branches dendroid; intravaginal. Bud complement 9-13. Branch complement many; in a horizontal line; with 1 branch dominant. Culm-sheaths tardily deciduous; 5.9-9.6 cm long; truncate at apex. Culm-sheath ligule 0.5-1 mm high; entire. Culm-sheath blade triangular; narrower than sheath; demarcated but persistent; 5.5-7 cm long; scabrid. Leaves 19-24 per branch. Leaf-sheaths pubescent. Ligule a ciliolate membrane; 0.5-0.8 mm long; truncate. Collar without external ligule. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.5 cm long. Leaf-blades linear; 4.5-6.5 cm long; 4-4.5 mm wide. Leaf-blade venation without cross veins. Leaf-blade surface glabrous. Leaf-blade apex acuminate.