On Mon, 09 Dec 2013 21:53:15 +1100, F Murtz wrote:

Some sort of passion vine/passion fruit
http://en.wikipedia.org/wiki/Passiflora

This thing is growing near a passionfruit but does not seem to fruit, it
is a puny looking vine but seems more prolific than the passionfruit.

Not all passionfruit vines fruit.