Help ID mystery vine
A friend found a vine growing in an alley in Richmond, VA, zone 7, that he's trying to ID. Dry soil area, heart shaped opposite leaves about 3" long, 4.5" long seed pod on 1" long stem, about 1" in diameter in the middle. We are both acquainted with identification keys and have used the VT dendrology key with no luck. Any suggestions? (Click on the thumbnails below for full size pictures.)
Thanks for any help.