Petals 8–14, as long as the sepals, oblong-lanceolate, obtuse or acute.
Moderately stout aquatic herb with elongate rhizome 1–2 cm. thick.
Sepals 4, 2.5–5 x 0.8–1.6 cm., ovate-lanceolate.
Seeds 1–5 mm. long, ellipsoid, smooth.
Flowers yellow, 4–8 cm. in diam.
Fruit 2 x 2–6 cm., subglobose.
Stamens 30–50.
Carpels 12–16.