Shrubby bamboos. Rhizomes short necked, pachymorph. Culms unicaespitose, to 4 m tall, distally pendulous; internodes terete, glabrous, cavity not filled with pith; nodes raised. Mid-culm branch buds very broadly ovoid, bud scale open at front, branch sheathing reduced, very many branch initials visible in 2 ranks. Branches very numerous and congested; branchlets initially 8–16 in 2 or 3 rows, later to 80, verticillate, subequal, slender. Culm sheaths deciduous, narrowly triangular, papery, adaxially scabrous inside apically, apex narrowly acuminate with distally concave edges, blade subulate. Leaves small-sized, narrowly lanceolate to lanceolate, delicate, matte, transverse veins absent. Inflorescence ebracteate, interrupted falcate panicles and dense clusters on leafy or leafless flowering branches. Spikelets delicate, 2–6 flowered, followed by a sterile floret, pedicel curved, short to long. Glumes 2, membranous. Lemma longer than second glume, leathery, many veined, acuminate; palea equal to or shorter than lemma, 2-keeled, obtuse; lodicules 3, transparent. Stamens 3; filaments free, long exserted; anthers yellow. Ovary appendage absent; style 1; stigmas 2, plumose. Caryopsis grainlike, narrow. New shoots summer–early autumn.
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