I don't care what its name is as it's beautiful no matter what it's called. I love the trellis it's on too!!!
If you vaguely remember buying the Dr. Ruppel, then I bet that is it!!!! They are very close in comparison indeed. This one does have a sort of ruffle to the petals like Dr. Ruppel though. . . http://davesgarden.com/guides/pf/showimage/156755/ (Compared to the pics in the link above . . . I love yours best!!!!)
This is the one I have been thinking about ordering, that's why I thought your's looked familiar. I hate buying a plant without a tag, it gets so confusing later when you try it ID it. http://www.gardenvines.com/catalog/clem ... p-202.html