Description from Flora of China
Sagittaria lappula D. Don, Prodr. Fl. Nepal. 22. 1825; Lophiocarpus lappula (D. Don) Miquel; Lophotocarpus formosanus Hayata; L. guayanensis (Kunth) J. G. Smith var. lappula (D. Don) Buchenau.
Stolons usually lacking. Floating leaves broadly ovate to cordate-ovate, 1.2-9 × 1-10 cm, base deeply cordate, apex obtuse; submerged leaves linear or lanceolate, 3-11 cm × 5-10 mm. Inflorescences racemose, 8-40 cm, in 2-6 whorls of 3 flowers; bracts connate toward base. Bisexual flowers usually on lower 1-4 whorls; pedicels 1-1.5 cm, thickened. Male flowers with pedicel 2-5 cm. Sepals not reflexed after anthesis, ovate, 0.5-1.5 cm × 3-15 mm. Petals fugacious, obovate, subequal to sepals. Stamens 6 to numerous; anthers yellow. Achenes obovoid or elliptic, 2-4 × 1.5-3 mm, with cristate wing and oblique adaxial beak. Fl. May-Sep, fr. Jun-Nov. 2n = 22*.
Ponds, lakes, marshes, paddy fields and channels. Anhui, Fujian, Guangdong, Guangxi, Guizhou, Hainan, Hubei, Hunan, Jiangxi, Taiwan, Yunnan, Zhejiang [Afghanistan, Cambodia, India, Indonesia, Malaysia, Nepal, Pakistan, Thailand, Vietnam; Africa].