3. Sagittaria trifolia Linnaeus, Sp. Pl. 2: 993. 1753.
野慈姑 ye ci gu
Plants stoloniferous, stolons often ending in a tuber. Leaves aerial at least when mature, sagittate, sheathing, apex acuminate to rounded, lateral lobes longer than middle lobe. Inflorescences racemose, in 3 to many whorls of 3 flowers, lower 1-3 whorls usually branched; bracts free or connate toward base. Flowers unisexual; female flowers on lower 1-8 whorls, with short pedicels; male flowers with pedicels 0.5-1.5 cm. Sepals reflexed, ovate, 3-5 × 2.5-3.5 mm. Petals obovate, ca. 2 × as large as sepals. Stamens numerous; anthers yellow. Achenes obliquely obovoid, 4.5-5.5 × 4-5 mm, winged, with an erect, apical beak. Fl. and fr. May-Nov. 2n = 22*.
Ponds, lakes, marshes, paddy fields and channels. Anhui, Beijing, Fujian, Gansu, Guangdong, Guangxi, Guizhou, Hainan, Henan, Hubei, Jiangsu, Liaoning, Qinghai, Shaanxi, Shandong, Sichuan, Taiwan, Xinjiang, Yunnan, Zhejiang [Afghanistan, India, Indonesia (Borneo, Java), Japan (including Ryukyu Islands), Kazakhstan, Korea, Kyrgyzstan, Laos, Malaysia, Myanmar, Nepal, Pakistan, Philippines, Russia, Tajikistan, Thailand, Uzbekistan, Vietnam; SW Asia, Europe].