Culms to 20 m or more, to 20 cm in diam.; internodes to 40 cm or more, basal ones gradually shortened and thickened toward base, initially white powdery, densely puberulent; wall ca. 1 cm thick, nodal ridge inconspicuous at nodes without branches, more prominent at branching nodes and in slender culms; sheath scar setose on margin. Culm sheaths yellow-brown or purple-brown with dark brown spots, densely brown hairy; auricles relatively small; oral setae strongly developed; ligule arcuate to acutely so, long ciliate; blade initially erect, becoming reflexed, green, narrowly triangular or lanceolate to linear. Leaves 2–4 per ultimate branch; auricles inconspicuous; oral setae present; ligule prominent; blade small, thin, 4–11 × 0.5–1.2 cm, abaxially proximally pubescent along midrib, secondary veins 3–6-paired, tertiary veins ca. 9. Flowering branchlets spicate, 5–6 cm; scaly bracts 4–6, gradually larger, sometimes with 1–3 additional bracts resembling foliage leaves at base; spathes more than 10, laterally imbricate, lower ones sterile and deciduous giving naked stalklike axis, upper part puberulent, margins ciliate; auricles absent; oral setae deciduous; blade lanceolate to subulate, small. Pseudospikelets 1–3 per spathe. Spikelets with 1 floret. Glume 1, 1.5–2.8 cm, apex with a small subulate blade, pubescent; rachilla extension short, awnlike, internodes puberulent; lemma 2.2–2.4 cm, distally and marginally pubescent; palea slightly shorter than lemma, distally pubescent; lodicules lanceolate, ca. 5 × 1 mm. Anthers ca. 1.2 cm; filaments ca. 4 cm. Stigmas 3. Caryopsis narrowly elliptic, 5–10 × 1.5–1.8 cm, apex with persistent style base. New shoots Apr, fl. May–Aug. 2n = 48*.
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A bamboo. It grows 20 m tall. The stems are 20 cm across. The internodes are 40 cm long. There are 2-4 leaves on the last branch. The leaf blade is 4-11 cm long by 1 cm wide.
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