Rhizome neck 2–4 cm, 1.2–2.5 cm in diam., internodes 1–4 mm. Culms to 4.2 m, 6–13 mm in diam.; internodes cylindrical, 15–20(–29) cm, rigid, initially glaucous and densely white powdery, longitudinal ribs obscure; wall 2–4 mm thick. Branches many, deflexed, subequal, slender; nodes and sheath scars prominent; shoots purple when fresh, glabrous, sheath margins densely yellow-brown ciliolate. Culm sheaths yellowish brown, narrowly rounded or rarely narrowly triangular, leathery, sharply narrow in upper part, longitudinal ribs prominent, adaxially distally white-gray or gray-yellow setose, especially densely so close to apex, distal margins densely yellow-brown to brown setose; auricles and oral setae absent; ligule prominent, 1–4 mm, initially densely white-gray to gray-yellow ciliolate, cilioles deciduous; blade usually reflexed, triangular to linear-lanceolate, glabrous. Leaves 2–5 per ultimate branch; sheath light green or purplish, 2–3 cm, glabrous, margins densely white-gray to gray-yellow ciliolate; auricles and oral setae absent; ligule truncate, ca. 1 mm, initially with dense, gray-yellow cilia ca. 1.5 mm; blade narrowly lanceolate, (2–)5–8.5(–10) × 0.4–0.5 cm, glabrous, secondary veins 2-or 3-paired, transverse veins distinct, margins spinescent-serrulate. Inflorescence unknown. New shoots Jun.
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