Ornduffia reniformis, also known as the running marsh-flower, is a species of plant in the Menyanthaceae family of wetland plants that is endemic to Australia.

The species is an emergent, aquatic, perennial herb that grows to a height of 1.3 m. It has round to reniform (kidney-shaped), glossy green, floating leaves 3–12 mm across.

The seed capsules are 6–12 mm long, with fruiting taking place mainly from October to April.

[2] The range of the species includes parts of Queensland, New South Wales, South Australia, Victoria and Tasmania, where it inhabits freshwater wetlands, including temporarily flooded depressions.

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