Pimelea nivea Cotton Bush Tasmanian Endemic
Motoring along the Eastern Tasmanian coast road towards Freycinet National Park, we spied a large patch of tall white flowers on the verge. They seem to fit the description and few photos of Pimelea nivea which does grow on the coast and up to 1,000 feet in the hills. P. nivea is also known as Round-leave Rice-flower.
In the close-up photo you can see the very cottony fibres which probably give this plant its English name.