black coral pea..

..or more formally Kennedia nigricans.
A member of the Pea family this species is endemic to the south west of Western Australia and known as a vigorous climber.

Planted in some very uninviting soil and rock on the side of a shed it has lived up to the vigorous claim.
Now going 'bananas' on the shed, beside the shed and up the tree next to the shed it certainly lives up to its reputation.
There are a number of yellow and black combinations in flowers but I think this is just a little bit different.