Culms to 5 m, to 2.2 cm in diam.; internodes terete, 18–20 cm, light yellow waxy below node, glabrous, nearly solid; nodes smooth, supra-nodal ridges weakly prominent; sheath scar prominent, glabrous. Branches many per node. Culm sheaths persistent, linear to narrowly triangular, much longer than internodes, proximally leathery, distally papery, brown to dark brown setose, longitudinal ribs prominent; auricles absent or small; oral setae erect, yellow, 3–4 mm; ligule truncate, ca. 1 mm, glabrous; blade unknown. Leaves 2–4 per ultimate branch; sheath glabrous; auricles absent; oral setae few, erect, yellow or gray-yellow; ligule purple, truncate, ca. 1 mm, glabrous; blade lanceolate, 10–19.5 × 1.3–1.7 cm, glabrous, secondary veins 5-or 6-paired, transverse veins distinct, base cuneate, margins spinescent-serrulate, apex long acuminate. Inflorescence unknown. New shoots autumn.
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