2. Ottelia balansae (Gagnepain) Dandy, J. Bot. 72: 137. 1934.
贵州水车前 gui zhou shui che qian
Oligolobos balansae Gagnepain, Bull. Soc. Bot. France 54: 543. 1907; Boottia sinensis H. Léveillé & Vaniot; Ottelia demersa H. Li & C. X. You; O. sinensis (H. Léveillé & Vaniot) H. Léveillé ex Dandy.
Leaves wholly submerged, translucent, young leaves linear or lanceolate, mature ones usually oblong or ovate, 20-40 × 6-9 cm, base truncate, rounded, or cordate, apex acute or rounded; petiole ca. 20 cm. Spathe elliptic, 3-6 × ca. 1.5 cm, with many longitudinal ribs and often with wings on lateral sides, with 3-11 flowers. Flowers bisexual. Sepals green. Petals white with yellow base, obtriangular or obovate, 2-3 × ca. 2.5 cm. Stamens 3; filaments 4-5 mm; anthers elliptic, 4-5 mm; glands 3. Ovary triangular-cylindric, with 3 carpels; styles 3, hairy; stigmas 6, hairy. Fruit narrowly elliptic, 5-9 cm × ca. 8 mm. Seeds cylindric to fusiform, ca. 3 mm. Fl. and fr. Jun-Nov.
Ponds, rivers, lakes. Guangxi, Guizhou, Yunnan [Vietnam].