Dioscorea batatas I believe. Smilax has alternate leaf arrangement. Dioscorea batatas opposite to occasionally whorled. HTH Chris Here is a link that might be useful: Cinnamon Vine

Here is another picture of same vine: http://www.hcnews.com/donnell/vine1.png i am not very savvy at gardenweb.... maybe there is a way to upload two pictures but I did not see a way to do that... Here is a link that might be useful:

Looks like Cypres vine, Ipomoea x quamoclit. Here is a link that might be useful: Ipomoea x ...

So I'm now thinking it might be Fallopia scandens, climbing bindweed, a New England native. The seeds are completely wrong for the Eurasian bindweed (Convolvulus arvensis) That puts me into more of a conundrum; while it's a native it's also very aggressive. CT regards it as a prohibited invasive, which is a curious designation for a native plant. It's not on the MA invasives list.