水蓑衣(原变种) shui suo yi (yuan bian zhong)

Ruellia ringens Linnaeus, Sp. Pl. 2: 635. 1753; Dipteracanthus ringens (Linnaeus) Abeywickrama; Hygrophila angustifolia R. Brown; H. lancea (Thunberg) Miquel; H. megalantha Merrill; H. quadrivalvis (Buchanan-Hamilton) Nees; H. salicifolia (Vahl) Nees; H. salicifolia var. megalantha (Merrill) H. S. Lo & L. D. Chou; Justicia lancea Thunberg; R. quadrivalvis Buchanan-Hamilton; R. salicifolia Vahl.

Calyx grayish pubescent. Corolla to 1.2 cm.

Along streams, wet places; below 1000 m. Anhui, Chongqing, Fujian, Guangdong, Guangxi, Guizhou, Hainan, Henan, Hubei, Hunan, Jiangsu, Jiangxi, Sichuan, Taiwan, Yunnan, Zhejiang [Bhutan, Cambodia, India, Indonesia, Japan, Laos, Malaysia, Myanmar, Nepal, Pakistan, Philippines, Thailand, Vietnam].