The specific location where Filsoniana ferdinandmuelleri was first discovered is not directly mentioned in the search results. However, it is associated with the work of Ferdinand von Mueller, a prominent botanist known for his extensive exploration and documentation of Australian flora. Mueller's work often took place in remote areas of Australia, including regions like Queensland, where he discovered various plant species.
For more detailed information, you might want to explore resources related to Ferdinand von Mueller's botanical expeditions, such as the Royal Botanic Gardens Victoria, which discusses his discoveries in Queensland near the Paroo River.
If you have access to specific botanical databases or publications, they might provide more precise details about the discovery of Filsoniana ferdinandmuelleri.