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 3âÂÂ12 mm across. The yellow flowers, which appear on erect panicles from October to March, are 6.5âÂÂ12 mm long and 19âÂÂ43 mm in diameter. The seed capsules are 6âÂÂ12 mm long, with fruiting taking place mainly from October to April.
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.