There are some plants in Far North Queensland that are indications of the spread of certain plant families from southeast Asian into Australia, ie they indicate a close relationship between the Australian tropics and the Malesian tropics (a botanical region that includes many southeast Asian countries). Gomphandra australiana is one such plant. I found Melanie Schori’s recent thesis on a revision of Gomphandra and it comfirms G. australiana to be the only representative of the genus in Australia while the stronghold of the genus remains in southeast Asia. There has also been some changes in the family level taxonomy. Previously G. australiana was placed in a family known as the Icacinaceae, a little known tropical family of plants. Now it is placed in the Stemonuraceae in which also belongs the FNQ endemic tree Irvingbaileya australis.
Whatever the family, it brings Southeast Asia into the wet tropics of Australia!
There is not very much that is easy to use to this understorey tree when not in flower or fruit.
Perhaps the few but strong veins which form loops towards the edge of the lamina might be a good character. The leaves are deep green and kind of fleshy-leathery.
During some of my research work in the Daintree, we collected some wood of the species to examine its wood anatomy [See my other post]. If you think Gomphandra is non-descript, you must look deeper, and you will see great beauty!