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Monoecious. Leaves all submerged, in rosettes, crowded, radical or on petioles, thin but firm, variable in size and shape, linear-lanceolate to ovate-lanceolate, up to 23 cm long and 5 cm broad, attenuate above and below, margin wavy, entire or sparsely denticulate. Inflorescence on a peduncle which is triangular in cross-section, up to 23 cm long and 3 mm in diam.; spathes saccate, compressed, narrow-ovate in outline, becoming much broader in fruit, up to 4 cm long and 2 cm broad, green with brownish nerves, narrowly winged, orifice with a few irregular small teeth; flowers bisexual; perianth-tube just exserted from spathe, outer segments linear-oblong, 8 mm long and 2 mm broad, green, inner obovate, 25 mm long and 9 mm broad, yellow or cream, with a small gland at the base; stamens 6, filaments flattened, 4 mm long, anthers small; ovary 17 mm long and 4 mm broad, placentas 6, unequal, styles 6 with 2 short stigmaticrarms. Fruit enclosed in the spathe, seeds small, cylindrical, covered with fine white hairs.
A herb that grows in water. It keeps growing from year to year. The leaves are under the water. They are 30 cm long by 6 cm wide. The leaves let light through. The flowers are yellow or white and are above the water.
Aquatic herb. Leaves all submerged, lanceolate, tapered at base, margin entire, undulate. Monoecious. Flowers bisexual. Flowers yellow or cream.
Flowers just above water-level, yellow or white (dried specimens always appear to be yellow).
Leaves often purple-tinged
A submerged aquatic
