水莎草(原变种) shui suo cao (yuan bian zhong)

Cyperus serotinus f. depauperatus Kükenthal; Juncellus serotinus (Rottbøll) C. B. Clarke; J. serotinus f. depauperatus (Kükenthal) L. K. Dai.

Spike rachis laxly hispidulous. Spikelets 0.8-2 cm. Nutlet broadly ellipsoid to ovoid. Fl. and fr. Jul-Oct.

River margins, sandy places by water, shallow water, along trails, fields; 400-1300(-2500) m. Anhui, Chongqing, Fujian, Gansu, Guangdong, Guangxi, Guizhou, Hebei, Heilongjiang, Henan, Hubei, Hunan, Jiangsu, Jiangxi, Jilin, Liaoning, Nei Mongol, Ningxia, Shaanxi, Shandong, Shanxi, Taiwan, Xinjiang, Yunnan, Zhejiang [Afghanistan, India, Japan, Kashmir, Kazakhstan, Korea, Kyrgyzstan, Pakistan, Russia, Turkmenistan, Uzbekistan, Vietnam; SW Asia, Europe].

Cyperus serotinus var. serotinus is naturalized in E North America.