I bought this little twig on ebay last month, and while I knew it had small blooms, I apparently missed them altogether. Interesting fruits though...
Passiflora quinquangularis fruit
Looks like capsularis and rubra fruits. Watch them, they will suddenly be ripe and split open and ants will carry the seeds away!
When I saw this listed on ebay, I too felt that is was Capsularis, not Quinquangularis, however, I am not possitive of that. While I have seen Capsularis, I've never seen an actual plant of Quinquangularis.
Mark