Another site with Western aussie flora info (not just cp's):
If you need 'specimen' data access you'll need to fork over $2000 - not sure if that's US or AU $ - otherwise it's FREE.
Plug the 'genus' into the search box and GO.
On the next page find your 'species' and click on the 'leaf' for all the info available on one page.
Of particular interest to me is the 'soil' listings and location info.