Help ID this vine

There are said to be eight types of wild grape in this state and so I keep one eye on vines everywhere I go, because I still haven't seen any and I would like to. It turns out there are a lot of different vines out there! And unlike trees and wildflowers and herby stuff, I haven't found any good resources for identifying wild vines.

So, this one is growing up a honey locust tree quite happily; I picked it up from the ground in the late winter and trained it up the tree, thinking it might be a passion fruit vine because some were nearby last fall. Turns out it is not. Instead, it's a vine that we have growing in several places along the fence. It has large open clusters of berries (still green this time of year) but the berries consist of a thin flesh over two large hemispherical seeds that between them constitute 80% of the bulk of the berry.

The leaves tend to sprout from nodes along the vine that shoot out a big leaf, a little leaf, and a tendril from each node. The tendril is very curly/graspy.

I'm fairly sure it's no grape because the leaves are not grape-like and because of the odd little seedy berry. I'd just like to identify it so I can determine where it fits in my vegetative scheme or whether I should whack it down ruthlessly and plant vines I like better in its place.

Any ideas or suggestions or keywords to support further Google searching? Thanks!

Here's an instructive video:



After watching it, I think you will definitely know how to identify those two. He also has other resources at eattheweeds.com

Thanks, John! That was really helpful! I've got Virginia Creeper (already tentatively identified) and possibly Smilax -- now I know how to tell for sure.

I also did not know that the Eat The Weeds guy did videos as well as his excellent blog. I'll go look for some more. Maybe he's got one that identifies my mystery vine. Anyway I like his voice, it reminds me of the late Pete Seeger when he gets to telling a story.

My local wildcrafting group has got me about convinced that this vine is porcelainberry.