Description from Flora of China
Hottonia indica Linnaeus, Sp. Pl. ed. 2, 208. 1762; Limnophila gratioloides R. Brown.
Perennials, amphibious. Submerged stems much branched, glabrous. Aerial stems to 15 cm, simple or branched, glabrous, with stalked or sessile glands to nearly smooth. Submerged leaves whorled, 1.5-2.5 cm, pinnatisect; segments flattened to capillary. Aerial leaves usually whorled, pinnately lobed, 0.4-2 cm, sometimes few opposite and crenate. Flowers axillary from aerial leaves, solitary. Pedicel slender, 2-10 mm, usually longer than bract, with sessile or stalked glands. Bracteoles 2, 1.5-3.5 mm, margin entire or sparsely serrate, apex acute. Calyx 3.5-5 mm, with sessile glands, without raised veins in fruit; lobes 2-3 mm, ovate to lanceolate, apex short acuminate. Corolla white, pale purple, or red, 1-1.4 cm. Capsule dark brown, compressed, ellipsoid to subglobose, ca. 3 mm. Fl. and fr. Mar-Nov.
Ponds, wet places; below 1800 m. Guangdong, Guangxi, Hainan, Taiwan, Yunnan [Cambodia, India, Indonesia, Japan, Laos, Malaysia, Nepal, Pakistan, Sikkim, Sri Lanka, Thailand, Vietnam; Africa, SW Asia, Australia, Oceania].