Rottboellia exaltata L.f., Nov. Gram. Gen. 40. pl. l. 1779. Hsu, Fl. Taiwan 5: 685.1978; Koyama, Grass. Jap. Neighb. Reg. 473. 1987.
Rottboellia exaltata L. var. appendiculata Hack. In DC., Monogr. Phan. 6: 295. 1889; Honda, Monogr. 369. 1930.
Rhizome elongated. Culms tufted, about 5 mm across. Blade up to 30 cm long by 6 mm wide. Inflorescence of a single raceme, about 10 cm long. Spikelets paired, dimorphic; rachis-joint swollen and fused together with pedicel of more or less reduced upper spikelet. Lower spikelet sunken in a cylindrical rachis-joint, about 4.2 mm long; lower glume coriaceous, broadly lanceolate, as long as the spikelet, 7-9-nerved, tessellate nerved on upper part; upper glume of the same texture, entirely sunken in the cavity of the rachis-joint, boat-shaped, numerous nerved. Lower floret oblong, as long as the glume; lemma 3-nerved, chartaceous, margins slightly folded and membranous; palea subcoriaceous, margins folded and membranous. Upper floret membranous; lemma broadly deltoid, margins folded; palea lanceolate or deltoid, 2-3 mm long.
TAICHUNG: Tsolungpu, Hsu 4677. CHANGHUA: Pakuashan, Kuoh 1602. NANTOU: Lienhuachi, Suzuki s. n. July 10, 1930. KAOHSIUNG: Kaohsiung, Matuda s. n. May 9, 1916. PINGTUNG: Oluanpi, Hsu 516. TAITUNG: Chihpen, Hsu 336; Botel Tobago, Hsu 4797. TAINAN: Morimoto s. n. Aug. 9, 1942*.
Commonly distributed in tropical Asia and Africa, Malaysia, Australia and China.