Without pictures, ID is difficult - if not darned near impossible (even with pics it can be tough - I belong to a tree-related forum and we get all sorts of what kind of tree is this posts)
On my property, I'm at war with Black swallow wort. It's a fast growing vine with purpley flowers. Thrives in the rich soiled shady environment of a back north facing slope adjacent to a brook.
Just as tenacious as bittersweet (at least it's not a woody vine). Root system gets a good hold on the ground. They're white and tendril-like.
Lots of info here:
http://www.nysgextension.org/glhabit...wallowwort.pdf
Closeup of flower (leaf shot not very good, however)
Better shot of leaves, with seed pod
