Posted: 09/06/2015 at 19:50
Not sure that's legume
It might be this http://www.seasonalwildflowers.com/climbing-corydalis.html
known as climbing corydalis.
A wonderful thing, the internet. I had something that looked like that years ago and never did find out what it was. Today I googled white climbing corydalis, and there it was, my plant, and maybe yours?