Nymphaea ondinea subsp. petaloidea is a subspecies of Nymphaea ondinea native to the Northern Territory, and Western Australia.
It is a robust, perennial, tuberous herb.
The flowers have 15âÂÂ33 mm long sepals, and 1âÂÂ4 (âÂÂ5) petals. The androecium consists of 27âÂÂ34 stamens, and the gynoecium consists of 5âÂÂ10 carpels.
Unlike the autonymous subspecies, Nymphaea ondinea subsp. petaloidea flowers possess petals, in addition to a larger flower, more carpels, and more stamens.
It was first published as Ondinea purpurea subsp. petaloidea Kenneally & E.L.Schneid. by Kevin Francis Kenneally and Edward L. Schneider in 1983. It was transferred to the genus Nymphaea L. as Nymphaea ondinea subsp. petaloidea (Kenneally & E.L.Schneid.) Löhne, Wiersema & Borsch by Cornelia Löhne, John Harry Wiersema & Thomas Borsch in 2009. 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.
It is placed in Nymphaea subgenus Anecphya.
Under the Biodiversity Conservation Act 2016, is classified as a Priority 1: Poorly-known species.
It occurs in non-perennial creeks.