短叶水蜈蚣(原变种) duan ye shui wu gong (yuan bian zhong)

Cyperus brevifolius (Rottbøll) Endlicher ex Hasskarl.

Culms 5-30 cm tall. Longest involucral bract erect to oblique. Spike 5-11 × 4.5-10 mm, with numerous spikelets. Spikelets 1-flowered. Glumes with a spinulose keel, apex recurved mucronate. Fl. and fr. May-Oct. 2n = 18.

Under shrubs or forests, grasslands, swamps, meadows, mountain slopes, valleys, wet places along trails, ditch margins, shallow water, river margins, paddy field margins; 100-2800 m. Anhui, Chongqing, Fujian, S Gansu, Guangdong, Guangxi, Guizhou, Hainan, Heilongjiang Henan, Hubei, Hunan, Jiangsu, Jiangxi, Jilin, Liaoning, Shaanxi, Shandong, Sichuan, Taiwan, Xisha Qundao, S and SE Xizang, Yunnan, Zhejiang [Afghanistan, Bangladesh, Bhutan, India, Indonesia, Japan, Korea, Laos, Malaysia, Myanmar, Nepal, Pakistan, Papua New Guinea, Philippines, Sri Lanka, Thailand, Vietnam; tropical Africa, Atlantic Ocean islands, Australia, Central, North, and South America, Indian Ocean islands, Madagascar, Pacific islands].