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Beautiful image. Passion flowers can vary in color and there are so many cultivated versions. I suggested an id above, but it would help to see the leaves and stems better.
This is a Passion Flower lauret. I think a little more information about the plant would help to identify the actual type. I believe you have quite a few types of passion flower ( which is a vine belonging to family Passifloraceae) in Reunion Islands
http://en.wikipedia.org/wiki/Passiflorac...
ça pousse à l'état sauvage?