Perennial; caespitose. Rootstock evident. Rhizomes short; pachymorph. Culms erect; 800 cm long; 70 mm diam.; woody; with aerial roots from the nodes. Culm-internodes terete; thin-walled; 35-45 cm long; light green. Lateral branches dendroid. Culm-sheaths 30-55 cm long; hispid; with appressed hairs; with dark brown hairs; auriculate; with 4 mm high auricles; setose on shoulders; shoulders with 5-7 mm long hairs. Culm-sheath ligule dentate. Culm-sheath blade triangular; cordate; 12-27 cm long; 80-100 mm wide; with ciliate margins; acuminate. Leaves cauline. Leaf-sheaths striately veined; glabrous on surface; outer margin hairy. Ligule an eciliate membrane; brown; obtuse. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.1-0.2 cm long. Leaf-blades lanceolate; 15-35 cm long; 20-55 mm wide; glandular. Leaf-blade midrib conspicuous. Leaf-blade venation with 24-26 secondary veins; without cross veins. Leaf-blade surface scabrous; rough on both sides. Leaf-blade margins scabrous. Leaf-blade apex acuminate.