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.
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