Culms 2.5–3.5 m, ca. 8 mm in diam.; internodes basally grooved above branches, with light powdery traces, black powdery below nodes; nodes weakly raised; sheath base persistent; intranode ca. 4 mm. Culm sheaths purple spotted, glabrous, occasionally sparsely setose at base, margins ciliate; auricles and oral setae absent; ligule arcuate, 3–4 mm, nearly glabrous; blade reflexed, narrowly linear-lanceolate, ca. 1/2 as wide as sheath apex, both surfaces puberulous, base slightly constricted, margin serrulate, apex acute. Leaves 3 or 4 per ultimate branch; sheath densely glaucous, hairy at base, margin ciliolate; auricles and oral setae absent; ligule acute or arcuate, ca. 3 mm; pseudopetiole ca. 3 mm; blade narrowly lanceolate, 11–17 × 0.6–0.7 cm, abaxially densely puberulous, base broadly cuneate, margins spinescently serrulate, apex tapering, long acuminate. Inflorescence unknown. New shoots Jun.
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