Firstly it is Tasmania. No Z. Those Taswegians would get offended <G>.
Leatherwood is of the genus Eucryphia. It is a tree that only grows in Tasmania although I believe that there is a little in Victoria but not many trees. Leatherwood is marketed as a floral source and is unique to Tasmania.. If you want details and brochures, send me an e.mail and I will give you an address to write to.
Trevor Weatherhead
AUSTRALIA