Rhizome neck 4–7 cm, 2.2–4 cm in diam. Culms to 5 m, 2–3.6 cm in diam.; internodes terete, 35–41 cm, longitudinal ribs prominent above branches, initially densely white powdery, glabrous or brown setose below nodes; wall 2–5 mm thick, pith initially spongy, becoming granular; supra-nodal ridges level; sheath scar prominent; intranode 4–6 mm. Branches 6–12 per node. Culm sheaths persistent, spotted, triangular to narrowly triangular, longer than internodes, leathery, brown setulose, longitudinal ribs prominent, margins initially densely brown ciliate, apex linear-triangular; auricles absent; oral setae erect, brown, slender; ligule convex, ca. 1 mm, glabrous; blade reflexed, linear-lanceolate, glabrous. Leaves 2–4 per ultimate branch; sheath margins yellow-brown ciliate or not ciliate; auricles absent; oral setae erect, yellow-brown, slender; ligule light green, convex, ca. 1 mm, glabrous; blade narrowly lanceolate, 3.6–10 × 0.3–0.6 cm, proximally white-gray pubescent, secondary veins 2-or 3-paired, transverse veins obscure, base cuneate, one margin spinescent-serrulate, other margin obscurely so. Inflorescence a racemose panicle; spikelets 3–6, 1.4–2.8 cm; rachilla internodes 2–3 mm; florets 2–7, terminal one sterile. Glumes 1 or 2, unequal, membranous, apex acuminate or obtuse; lemma puberulous, apex long acuminate. Palea keels ciliate, apex bifid; lodicules 3, apex ciliate. Anthers yellow-brown. Ovary red-brown; stigmas 2, plumose. Caryopsis unknown. New shoots Jul.
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