Fallopia baldschuanica, Mile a minute vine.

Well, what do you know? Thanks, Thedecoguy. Here I was, assuming this was a native weed that I found fairly enchanting, only to discover it's invasive. I wonder how on earth it ended up climbing all over the milkweeds and Spotted Joe Pye weed in my backyard!

All my Googling failed because I kept trying to find native vines of Northern New York. Gardenweb, as always, should have been my first stop.

It is definitely a Fallopia sp., however F. baldschuanica is unlikely. It may be F. cilinodis, which is native. It appears to have the characteristics fringed stipules of that species.

Okay, I definitely had to look up what a fringed stipule looks like. :) The F. cilinodis looks like a definite possibility. I'll have to take a closer look!

FWIW, I think 'Mile a Minute Vine' more usually refers to Polygonum perfoliatum, which is a REALLY nasty plant.

WW

I think Lycopus has it right with F. cilinodis. I took a closer look last night.

Fringed stipules:
{{gwi:247756}}

Thanks, everyone!