Perennial; rhizome short, vertical, swollen. Leaf lamina ± orbicular, to c. 40 cm wide, with sparse teeth to 2 mm long; undersurface glabrous. Flowers to 40 cm above water. Sepals 4, to 8 cm long, obtuse, with purple streaks; margins light pink, becoming deep pink. Petals to 33, oblanceolate, obtuse, white with pink tinge, becoming darker with age. Stamens to c. 300; filaments cylindrical, to 14 mm long; anthers to 10 mm long, usually with a small hooked appendage. Carpels 10–15; sterile stigmatic lobes vestigial or obsolete. Fruit c. 4 cm diam. Seeds c. 4 mm long, c. 2.5 mm wide, with discontinuous or disorganised rows of very short hairs.
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