You'll have to get the opinion of someone who grows a lot of Decalobas (a subgenus of Passiflora).

My guess would be maybe P. suberosa (???)

Here are a couple photos I found online:

http://species.wikimedia.org/wiki/File:Starr_070404-6651_Passiflora_suberosa.jpg

http://georgiavines.com/optimgs/passiflora/Passiflora_Suberosa2.jpg

Here is a link that might be useful:

I agree that it's a suberosa with the lobed foliage. Here's two whose blooms are pretty much identical but one has unlobed foliage. The mature stems of both should have a whitish corky covering, hence the common name "Corkystem Passion Flower".

suberosa lobed foliage

pallida unlobed foliage

{{gwi:134556}}