Hi Jan Moses,
Thanks for your question!
I’d recommend taking a look at The Cape York Peninsula Land Use Strategy (CYPLUS) (found in the resources section) which has an ecology section which outlines the different kinds of plants and vegetation on Cape York. While the resource is slightly older (from 1995), you can assume that most of the information is still relevant.
I also had a quick Google search and found this resource (linked below) which outlines some different plants on Cape York – I’d recommend taking a look and expanding your research from there.
Hope this helps!