Perennial; caespitose. Rhizomes short; pachymorph. Culms erect; nodding at the tip; 800-1200 cm long; 40-60 mm diam.; woody; without nodal roots, or with root thorns from the nodes. Culm-internodes terete; thick-walled; 40-50 cm long; distally mealy. Culm-nodes glabrous. Lateral branches dendroid. Buds or branches present on lower quarter of culm. Branch complement several. Culm-sheaths deciduous; glabrous; hairy on margins; convex at apex, or triangular at apex; auriculate; ciliate on shoulders. Culm-sheath ligule 3 mm high; ciliolate. Culm-sheath blade triangular; as wide as sheath at base; demarcated but persistent; erect; hispid. Leaves cauline. Ligule an eciliate membrane. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.1-0.15 cm long. Leaf-blades lanceolate; 3-16 cm long; 10-13 mm wide. Leaf-blade surface pubescent; hairy abaxially. Leaf-blade margins scabrous. Leaf-blade apex acuminate.