I'm mostly familiar with incarnata but that doesn't look like any Passiflora vine I've seen. I would be looking for the 3-lobed, trident-shaped leaves. Maybe other species do not have that type of leaf.
Is it twirling itself up that tree or does it have tendrils? Not 100% sure but i'd suspect all Passiflora have tendrils - they don't climb on their own.