It's the passion fruit flower. (Grows on a vine, right?) Watch and see if fruits develop; they should eventually turn yellow with a fragrance. The fruit is very tart and full of seeds; you can press it through a mesh strainer, then use the pulpy liquid for juices and cooking/baking. In Hawaii, it's also known as "lilikoi" - you might be able to google recipes.

~Aloha! :)

Yep. Passion Fruit Flower!

It's called a passion flower, it represents biblical scripture, there is a story to go along with it but I couldn't tell ya. my mom has them in her garden

wikipedia has a fair bit of information about passion flowers: http://en.wikipedia.org/wiki/Passion_flower