I bought it at the farmers market a few years ago. He called it a Hummingbird vine. I am pretty sure that is not the true name. The hummingbirds do love it though
Here in zone 7 it is an annual. It dies down in the fall and drops seeds.
It comes back every summer, all over the place. I have to pull out the seedlings that come up in surrounding areas. I leave a few of them and train them to the lattice on the back deck
<img src="http://bonniesplants.com/pictures/hummingbird_vine.jpg" width="400">
Bonnie