This marvelous tree is an endemic of the Daintree region, although a good sized tree can easily be seen at the Cairns Botanical Gardens.
For a member of the Polygalaceae, this tree has pretty large flowers. And they are beautifully fragrant, as the name suggests. It is also commonly known as Fragrant Boxwood.
The leaves are simple, alternate, has no stipules, hairless on both sides, and have a lanceolate shape with smooth margins. A good spot feature is the pair of glands near the leaf base that is visible on the leaf underside. Also, the leaf petioles seem rather thickened.
Leaf Whispering in the Tropics 