Sepals 4 (8 reported in the original description), 2.6–4.5 x 0.8–1.2 cm., ovate-oblong or lanceolate, acute.
Flowers blue or pink (yellow in specimens from Angola), 4–10 cm. in diam., floating or slightly emergent.
Petals 12–15, as long as the sepals, lanceolate, obtuse or acute.
Aquatic herb with elongate rhizome 1–2 cm. thick.
Stamens 20–30, connective-appendage acute.
Carpels 12–18; style short.
Fruit not seen.