According to the official website for the Brisbane Forest Park:
Brisbane Forest Park is striking in its diversity of environments and plant communities. Take a journey through open eucalypt woodlands, scribbly gum forests and lush subtropical rainforests. More than 800 species of plants are found in these forests, some of which are rare and threatened.
Of course the diversity of species is nowhere greater than in the rainforest pockets, such as the area of Green's Falls. Well worth the 2 hour return hike through the rainforest from Mt Nebo.
Click here to go to the official website of the Brisbane Forest Park.