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Dioecious. Leaves: primary leaves fugacious, submerged, linear to lanceolate, undulate; later leaves with a petiole which is triangular in cross-section and a floating, coriaceous, ovate lamina up to 12.5 cm long and 5.5 cm broad, cordate, obtuse or attenuate at the base, apex, rounded, 5-7 nerved. Male inflorescence with a flattened scape; spathe compressed, smooth, broadly ovate, 4 cm long and 2.5 cm broad, narrowly winged; flowers about 60, distichously and centrifugally arranged, maturing consecutively with about 1-3 appearing simultaneously; perianth-tube narrowly cylindrical, exserted for about 3 cm, outer segments narrowly lanceolate, 17 x 7 mm, inner widely obovate, forming a wide cup, 3 x 3 cm, white with a yellowish throat, stamens 12, filaments flattened, scabrid, anthers 15 mm long, narrow, pistillodes 3, yellow. Female inflorescence with an angled scape; spathe ovate, 5.5 cm long and 2.5 cm broad, fleshy, grooved; flower solitary, with a green perianth-tube, short at first, lengthening in fruit, outer segments green, firm, linear-lanceolate, 17 mm long and 5 mm broad, inner obovate, 4 cm long, white, staminodes 3, filiform, styles 3 short, with the stigmatic arms longer than the style, flattened, with the edges densely glandular-fimbriate, with a globular gland at the base. Fruit narrowly ovoid, 4-5 cm long, beaked.
Aquatic herb. Leaves with an ovate to cordate, floating lamina. Plant dioecious. Lamina up to 125 x 55 mm, apex rounded. Flowers white.
