Clematis leptophylla, Small-leaved Clematis; a local native climber.
Unfortunately someone rips them out on Mt Majura probably thinking this is a weed....
Waltraud
This is great to know Waltraud. I had a funny feeling this might be the species you mentioned to me once before that people accidentally get confused with a weed. I like the look of it, it really greens the bush up and looks quite attractive. Thanks for the ID - have updated.