Perennial; rhizome erect, elongated-tuberous. Leaves: juvenile lamina often retained for several years, sagittate, usually red; mature lamina broadly ovate, to 22 cm long, 18 cm wide, entire to slightly sinuate, often reddish below, especially toward margins, glabrous on undersurface. Flowers to 20 cm above water. Sepals 4, to 7 cm long, acute, occasionally obtuse, usually with purple flecks. Petals to 25, lanceolate, acute to obtuse, white. Stamens yellow, to c. 100; filaments cylindrical, to 18 mm long; anthers to 8.5 mm long, sometimes slightly apiculate. Carpels 11–22; sterile stigmatic lobes vestigial or obsolete. Fruit c. 2.5 cm diam. Seeds without longitudinal ridges or proliferations, elliptic, c. 1.75–2.5 mm long, c. 1–1.5 mm wide, glabrous.
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