Ornduffia parnassifolia is a species of plant in the Menyanthaceae family of wetland plants that is endemic to Western Australia.

The species is an emergent semi-aquatic herb with bright yellow, star-shaped flowers which appear on panicles throughout the year.

[2] The species occurs in the Esperance Plains, Jarrah Forest, Swan Coastal Plain and Warren IBRA bioregions of Southwest Australia.

[3] It is found in swamps and other seasonal wetlands along the southern coast from south of Bunbury to east of Esperance.

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