Culms suberect or apically slightly drooping, 1–7 m, (0.3–) 1.5–2.5 cm in diam.; internodes 30–50 cm, thinly white powdery, distally stiffly deciduously brown or dull brown hairy, especially densely so below nodes; wall usually rather thin, solid in var. riviereorum; nodes slightly prominent, glabrous; branching from 2nd or 3rd node up. Branches several to many, clustered, subequal or central slightly dominant. Culm sheaths deciduous, trapezoid, initially thinly white powdery, glabrous, asymmetrically arched, apex slanted along outer side; auricles very small to inconspicuous, oral setae few; ligule 1–1.5 mm, irregularly dentate; blade deciduous, erect, narrowly triangular, base nearly as wide as sheath apex, abaxially with scattered, stiff, dull brown hairs, adaxially scabrous, apex acuminate. Leaves 5–26 per ultimate branch; leaf blade abaxially pale glaucous, adaxially bright green, linear, 1.6–16 × 0.3–1.6 cm, abaxially densely pubescent, adaxially glabrous. Pseudospikelets solitary or several clustered at nodes of flowering branches, linear to linear-lanceolate, 3–6 cm; prophylls ca. 3.5 mm, 2-keeled, keels ciliolate; gemmiferous bracts usually 1 or 2, ovate to narrowly ovate, 4–7.5 mm, glabrous, 9–13-veined, apex obtuse or acute; florets (3–)5–13, middle ones fertile; rachilla segments flat, 4–4.5 mm, glabrous. Glumes absent; lemma asymmetrical, oblong-lanceolate, ca. 1.8 cm, glabrous, 19–21-veined, apex acute; palea linear, 1.4–1.6 cm, keels ciliolate, 6-veined between and 4-veined on one side and 3-veined on other side of keels, apex subtruncate, ciliolate, with a fine hairy tip on each side; lodicules 3, anterior 2 subovate, 2.5–3 mm, posterior narrowly lanceolate, 3–5 mm, margins glabrous. Filaments 0.8–1 cm; anthers purple, ca. 6 mm, apex penicillate. Ovary ovoid, ca. 1 mm, base with stalk ca. 1 mm, apex thickened and hispidulous; stigmas 3 or variable in number, ca. 5 mm, directly exserted from ovary apex. Mature caryopsis unknown.
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Dense clump-forming; habit spreading. Culms very numerous, 3-5 m × 1-2 cm diam. (except in small cultivated forms), many uniformly deep green but always some with prominent yellow stripes or bands. Culm-sheath with caducous black hairs; ligule short, inconspicuous; auricles 0; sheath-blade triangular. Branches several at each node, often branched secondarily, forming a tuft, the central branch largest. Leaf-sheath with long white apical bristles. Ligule abbreviated. Auricles present. Leaf-blade 6-15 × 0.6-1.5 cm, linear-lanceolate, acuminate, glaucous, abaxially finely puberulent. Inflorescence culms short, arising from periphery of clump, very slender. Spikelets sessile, several-flowered, in small distant clusters; bracts ensheathing clusters 1.3-1.8 cm. Lemma = palea. Lodicules membranous.
A hollow tufted bamboo. It forms clumps. It is 2-6 m tall. It has slender stalks. The stalks are 1-2.5 cm across. They arch over at the tips. The internodes are 30-50 cm long. The culm sheath is 12-15 cm long by 6-8 cm wide. It is light green when young and turns reddish-brown or pale brown. The leaves are flat and reddish-green. They are sword shaped and clasp the stem.The blade is triangular shape and 9-12 cm long. It tapers to the tip. The base attaches to the sheath. The leaves are usually at the end of a branch. There are 6-13 together. The blades are 7-12 cm long by 1-1.5 cm wide. Mature plants produce flowering branches which arch over. The flowers are at the end of a leafy branch. The spikelet is 3-4 cm long.
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