Perennial; caespitose. Rhizomes short, or elongated; pachymorph. Culms arching; 500-2000 cm long; 10-30 mm diam.; woody; without nodal roots. Culm-internodes terete; solid; distally glabrous, or pubescent. Culm-nodes swollen. Lateral branches dendroid; extravaginal. Branch complement many; in a clump; with subequal branches; thinner than stem. Culm-sheaths without auricles. Leaf-sheaths glabrous on surface; outer margin hairy. Ligule an eciliate membrane; 2-5 mm long. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.1-0.3 cm long. Leaf-blades deciduous at the ligule; lanceolate; 9-19 cm long; 9-18 mm wide; light green, or dark green. Leaf-blade venation with distinct cross veins. Leaf-blade surface glabrous, or pubescent; hairy abaxially.
Inflorescence a panicle. Peduncle pubescent above. Panicle open; ovate; 11-19 cm long; 3-8 cm wide. Primary panicle branches spreading; 1-2 -nate; 3-6 cm long. Panicle branches puberulous. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.5-4 mm long.