Herb, perennial, to 100 cm tall, glabrous; rhizomes to 6 x to 4 cm wide; corms 1-4 x 0.6-2 cm. Leaves submersed or emerged; submersed leaves sessile, pale green, linear, 1-5 x 0.1-0.3 cm, apex acute, basal lobes absent, veins 1-3; emerged leaves petiolate, petiole more or less triangular, 13.5-68 x 0.6-1.5 cm, basal sheath to 23 cm long, blade pale green, linear-elliptic, elliptic-ovate, rhombiform, to subcordate, 8.5-20 x 0.2-15 cm, apex acute, basal lobes absent, base acute to rarely sub-cordate, veins 9-13. Inflorescence a simple scape of 2-10 whorls, emerged, 3.5-37 x 1-5 cm, whorls with 2-3 flowers; peduncle terete, 12-79 x 0.1-0.9 cm; staminate bracts united at base, delicate to coarse, elliptic, 6-22 mm long, apex round-acute to obtuse; carpellate bracts united at base, coarse, elliptic, 6-35 mm long, apex obtuse; staminate pedicels spreading, cylindric, 2.2-4.9 x 0.02-0.12 cm; carpellate pedicels erect in flower, spreading in fruit, cylindric in flower, becoming expanded in fruit, 0.5-2.5 x 0.2-0.55 cm. Staminate flowers: sepals erect, 9-11.5 x 4-6 mm, petals clawed, to 20.5 x to 13 mm, claws to 7 mm long, stamens 9-12, filaments glabrous, dilated, 2.3-3.8 x ca. 0.4 mm, anthers linear, 1-1.8 x 0.3-0.5 mm, apex round-acute, sterile carpels present. Carpellate flowers: sepals appressed in flower and fruit, nearly enclosing fruiting aggregate, 1.4-2.3 x 0.9-2.5 cm, petals white, yellowish, or pinkish clawed, 15-30 x 1.3-2.5 mm, claw ca. 5 mm long, without ring of sterile stamens Fruit aggregate 1.2-3 cm diam.; achenes obelliptic, 3.2-7 x 2-3 mm, not tuberculate, without glands, keeled, beak lateral, horizontal, 0.7-1.2 mm long.
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A herb. It keeps growing from year to year. It grows 100 cm tall. It has underground stems or rhizomes 6 cm long by 4 cm wide. There are 1-4 corms 1-2 cm long. The leaves can be under the water or above. The underwater leaves do not have leaf stalks and the above water ones do. The sheath at the base is 23 cm long. The above water leaves are narrowly oval and 8.5-20 cm long by 1-15 cm wide. The flowering shoots have 2-10 rings. The flowering shoots are 4-37 cm long by 1-5 cm wide and there are 2-3 flowers in each ring.
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