Not quite Elmar. the can toad is an exotic, not a native Aussie. Pittosporum is actually a native plant from the east coast rainforests. It is just that when we take it out of its natural area it takes off and can swamp the local plants. I have no idea why it was restricted to the coast before when it is such a good colonizer of other habitats. There are other examples of native plants that are weeds when introduced to other parts of Aust - Cootamundra wattle is another.Cane toad in plant form...?!
These are just one more reason why WA and Tas have such strict quarantine. Not only exotic pests and diseases to deal with also native weeds.