petaloidea is a subspecies of Nymphaea ondinea native to the Northern Territory, and Western Australia.

[3] The flowers have 15–33 mm long sepals, and 1–4 (–5) petals.

[5] Unlike the autonymous subspecies, Nymphaea ondinea subsp.

[6][1] The type specimen was collected by E.L. Schneider in a small, non-perennial tributary to Mitchell River, Mitchell Plateau, North Kimberley, Australia on the 21st of January 1982.

[7] Under the Biodiversity Conservation Act 2016, is classified as a Priority 1: Poorly-known species.