Culms 4–5 m, 1.5–2 cm in diam.; internodes initially green-yellow, cylindrical, slightly concave at base above branches, 24–33 cm, densely ribbed, roughly hairy, black powdery when old, nearly solid; wall thick; nodes prominent, densely black powdery; sheath scars corky. Culm sheath pale green, slightly glaucous, deciduously tomentellate at base and margins; auricles falcate, margins sparsely setose and deciduously ciliate; oral setae light brown; ligules yellow-green, truncate; blade pendulous, linear-lanceolate, often revolute. Leaves 2 or 3 per ultimate branch; sheath glabrous; auricles absent; oral setae absent or rarely 1–3, erect, ca. 5 mm; ligule arcuate; blade narrowly lanceolate, 11–18 × 1.7–2.4 cm, abaxially pubescent, secondary veins 5–7-paired, base broadly cuneate, one margin serrulate, other margin nearly entire, apex acuminate or caudate. Inflorescence unknown. New shoots Jun.
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