渐尖穗荸荠(原变种) jian jian sui bi qi (yuan bian zhong)

Scirpus attenuatus Franchet & Savatier, Enum. Pl. Jap. 2: 543. 1878; Eleocharis japonica Miquel var. major Nakai; E. laeviseta Nakai var. major (Nakai) H. Hara.

Rhizomes decumbent. Culms 20-50 cm tall or more. Spikelet ovoid to narrowly ovoid, 6-10 mm or more. Perianth bristles densely retrorsely spinulose. Persistent style base 1/4-1/3 as long as nutlet, slightly narrower than width of nutlet. Fl. and fr. May-Sep.

Paddy fields, pond margins; 100-600 m. Anhui, Fujian, Guangxi, Henan, Hubei, Jiangsu, Shaanxi, Sichuan [Japan, S Korea, Papua New Guinea, Russia (Far East), Vietnam].