Perennial. Culms scandent; 1000-1500 cm long; 20-30 mm diam.; woody; without nodal roots. Culm-internodes terete; solid; 22-36 cm long; antrorsely scabrous. Lateral branches dendroid; infravaginal; spreading. Bud complement (2-)4-9(-12). Branch complement several; in a clump; thinner than stem. Culm-sheaths deciduous but leaving a persistent girdle; 18.5-39.2 cm long; 3.5 times as long as wide; antrorsely scabrous; hispid. Culm-sheath ligule 1-2 mm high. Culm-sheath blade triangular; demarcated but persistent; 2.5-8.4 cm long; scabrid; acuminate. Leaves 4-6 per branch. Leaf-sheaths keeled; hispid; outer margin hairy. Ligule an eciliate membrane; 11-30 mm long. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.2-0.5 cm long. Leaf-blades linear, or lanceolate; 14-25.6 cm long; 10-23 mm wide. Leaf-blade venation with obscure cross veins. Leaf-blade surface scabrous; rough adaxially; glabrous. Leaf-blade margins serrulate. Leaf-blade apex acuminate.
Inflorescence a panicle. Panicle contracted; linear; 21-30 cm long. Primary panicle branches appressed; 5-6 cm long. Panicle axis pubescent. Panicle branches angular; puberulous. Spikelets solitary. Fertile spikelets pedicelled. Pedicels angular; 1-4 mm long; pubescent.