Description from Flora of China
Columnea heterophylla Roxburgh, Fl. Ind. ed. 1832, 3: 97. 1832.
Perennials, aquatic. Aerial stems with sessile glands or pilose or nearly smooth and glabrous. Submerged leaves to 50 cm, multiparted; segments capillary. Aerial leaves opposite or whorled, sessile, oblong, ca. 15 X 3 mm, glabrous, base subamplexicaul, margin subcrenate; veins 3-5, parallel. Flowers sessile and in terminal spikes or short pedicellate and solitary in leaf axils. Bracteoles absent. Calyx ca. 3 mm, with sessile glands, without raised veins in fruit. Corolla pale purple, ca. 5 mm, glabrous. Capsule pale brown, subglobose, ca. 2.5 mm. Fl. Jul.
Rice fields, brackish waters; low elevations. Anhui, Guangdong, Jiangxi, Taiwan [Cambodia, India, Malaysia, Myanmar, Nepal, Sri Lanka, Thailand, Vietnam].