Hi! I'm new to GardenWeb and hope I'm posting in the right forum...

I'm trying to identify a vine that is growing in our backyard. It was planted by one of the former owners of our new home. I tried Google but couldn't find a definite answer.

Here are two pictures (you can click on them to make them bigger):

The vine has pink/purple flowers which have been blooming this entire summer. The flowers are about 1 inch in diameter. There are no tendrils. The vine has been growing in clay-ish soil, in partial shade.

I'm located in USDA zone 10.

Thanks!