The Golden Sunburst, and I think the botanical name is Hibbertia sp based on information given to me. The VicFlora website though shows it as Hibbertia Riparia. It goes on to say though that the name has possibly been misapplied in Victoria and is likely to be transferred to a new species. I think it’s easier to stick with Golden Sunburst.
It is a native plant and quite widespread throughout Victoria in quite a diverse range of habitats. The featured photo here was taken in Wedderburn, Vic, which is mallee scrubland.