If you haven’t read it already, start with the post “The Daintree” for a general post about the area.
At around 160 million years old the Daintree is the most ancient continual rain forest in the world, the area boasts the largest concentration of plants which are rare or threatened by extinction anywhere in the world. It has one of the highest concentrations of primitive plants found anywhere in the world, of the 19 primitive plant species found in the world, 12 are in the Daintree. That’s the same number as you’d find in all the rain forests of South America including the whole of the Amazon. There are also 28 mangrove species within the Daintree while Australia only has 36 species on total.