Not likely butterfly friendly...

Introducing Ceropegia woodii (String of Hearts) a tropical (South Africa area) vine that is closely related to milkweeds (Asclepias spp.).

This particular specimen grows in my office, and not until today (Friday's are office plant watering days) did I realize that it had started flowering. The flowers are quite striking and have five hairy petals. Not sure what pollinates it in the wild, but hopefully I don't find it roaming around my office...

Edit: I love Google...:

The waxy flowers are lined with small, downward pointing hairs that act to trap small flies that are attracted by the scent and enter the flowers. The insect is prevented from escaping until the hairs wither, and the fly departs with a pollinia (a mass of pollen grains that are transferred as a group) attached that can then be transferred to the next flower the fly visits. Hummingbirds may be attracted to the flowers if the plants are outside during the summer.