Culms 5–15 m, 4–8 cm in diam., with weakly pendulous apex; internodes gray or yellow-green at maturity, conspicuously striate, 25–35 cm, initially thinly white powdery, glabrous; wall ca. 5 mm thick; nodes usually asymmetrical, nodal ridge usually more prominent than sheath scar on one side. Culm sheaths yellow-green tinged with purple, or pale brown-yellow, densely spotted and blotched with brown especially toward center; auricles and oral setae absent; ligule pale brown to brown, arcuate, strongly decurrent on both flanks, ciliolate; blade reflexed, abaxially brown-purple, adaxially green, marginally paler or faintly orange-colored, linear-lanceolate, strongly crinkled. Leaves 2 or 3 per ultimate branch, auricles and oral setae developed; ligule to 3 mm; blade slightly pendulous, 9–18 × 1.2–2 cm. Flowering branchlets spicate; scaly bracts 4–6, gradually larger; spathes 5–7, glabrous or sparsely puberulent, auricles small; oral setae radiate; blade ovate-lanceolate to narrowly lanceolate, to 2.5 cm. Pseudospikelets 1 or 2 per spathe; spikelets 3.5–4 cm; florets 2 or 3, sparsely pubescent. Glume 1; lemma 2.7–3.2 cm, sparsely pubescent; palea 2.2–2.6 cm, subglabrous; lodicules narrowly lanceolate, ca. 5 mm. Anthers ca. 1.2 cm. Ovary glabrous; stigmas 3. New shoots Apr, fl. Apr–May.
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A large bamboo. It grows 9-18 m high and spreads 6-18 m wide. The culms are 10 cm thick. They are thin walled. The internodes are 25-35 cm long. There are 2 or 3 leaves on the last branch. The leaf blades are 9-18 cm long by 1-2 cm wide.
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