Perennial with a globular to elongate rhizome to c. 4 cm long. Leaf lamina orbicular to elliptic, to 45 cm diam., dentate with regularly-spaced triangular teeth to 1.5 mm long; undersurface glabrous. Flowers to 40 cm above water, lightly scented. Sepals 4, to 6.5 cm long, obtuse, green outside with purple streaks, streaks occasionally obscuring the green. Petals mostly 12–22, oblanceolate to spathulate, 4–6 cm long, 1.5–2.5 cm wide, obtuse, mostly white, rarely with some blue, when blue, most of the petals coloured, not just the outer petals, and fading only slightly with maturity. Stamens mostly 150–300, yellow; filaments cylindrical, to 25 mm long; anthers 2.5–5 mm long; appendages vestigial or obsolete. Carpels 7–19; sterile stigmatic lobes vestigial or obsolete. Fruit globose, c. 4 cm diam. Seeds spherical to elongate-spherical, 2–3.5 mm long, c. 2 mm wide, with ± continuous rows of short hairs usually c. 0.1–0.15 mm long.
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