HABIT Perennial. Rhizomes elongated; pachymorph. Culms erect, or leaning; 1500-2000 cm long; woody. Culm-internodes terete. Lateral branches dendroid. Culm-sheaths auriculate. Culm-sheath blade triangular; as wide as sheath at base. Ligule an eciliate membrane. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades lanceolate, or oblong. Leaf-blade venation with distinct cross veins. INFLORESCENCE Synflorescence bractiferous; paniculate; with glumaceous subtending bracts; with axillary buds at base of spikelet. Fertile spikelets sessile. FERTILE SPIKELETS Spikelets comprising 1-3 basal sterile florets; 1 fertile florets; with a barren rhachilla extension. Spikelets ovate; laterally compressed; 4.15-6 mm long; breaking up at maturity; disarticulating below each fertile floret. GLUMES Glumes one the lower absent or obscure; persistent; shorter than spikelet. Upper glume ovate; chartaceous; without keels; 7 -veined. Upper glume apex acute; mucronate. FLORETS Fertile lemma ovate; chartaceous; without keel. Lemma margins ciliate. Lemma apex acute. Palea tightly convolute around flower; chartaceous. Palea keels ciliate. FLOWER Lodicules 3, or several; ciliate. Anthers 6. Stigmas 2; pubescent. Ovary with a steeple-like appendage; glabrous. FRUIT Caryopsis with free brittle pericarp; orbicular. DISTRIBUTION Temperate Asia, or Tropical Asia.