Hibbertia diffusa, commonly known as wedge guinea flower, is a species of flowering plant in the family Dilleniaceae and is endemic to south-eastern Australia. It is a prostrate to low-lying shrub with glabrous stems, egg-shaped to lance-shaped leaves with the narrower end towards the base, and bright yellow flowers arranged on the ends of branchlets, with twenty to twenty-five stamens arranged around two or three carpels.

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