Phragmites karka (Retz.) Trinex Steud., Nom. Bot. ed. 2,. 2: 324. 1841; Hsu, Fl. Taiwan 5: 388. 1978; Koyama, Grass. Jap. Neighb. Reg. 240. 1987.
= Phragmites vallatoria
Tall reed. Ligule 0.3 mm long, upper margin fimbriate, blade up to 1 cm wide. Panicle large, dense. Spikelets several-flowered, 12 mm long; glumes lanceolate, chartaceous; the lower 3-4 mm long, 1-nerved, apex rounded, base attenuate; the upper 4-5 mm long, 3-nerved; lemma 5-10 mm long, chartaceous, 3-nerved, lanceolate, glabrous; callus elongated with silky hairs; palea 3 mm long, 2-keeled, margins minutely ciliate, apex truncate.
TAIPEI: Tachu, Chang 2991 ; Kuanyingshan, Hsu 1154. TAICHUNG: Kukuan, Hsu 453 . NANTOU: Sun Moon Lake, Suzuki s.n. Sept. 18, 1929.. TAINAN: Anping, Hsu 616. KAOHSIUNG: Liukuei, Suzuki s.n. Oct. 31, 1934 . TAITUNG: Ansou, Hsu 1039. HUALIEN: Yuli, Suzuki 5329.
India, Burma, Malaysia, China, and extening to Australia and Japan.
