Hard to tell from the small photos. Were the stems woody and grayish or gray-brown with tiny hairlike clumps of climbing tendrils? Or did they seem to have small prickles on them like a bramble (blackberry) plant? One glance looked a little like poison ivy, but the next look it seemed like a bramble plant to me.
Here is a page of photo links that may help.
When I was a nature counselor at a kiddie daycamp, the first day of camp I'd take the kids on a nature walk, and show them what poison ivy looks like so they could avoid it the rest of the summer. I'd say over and over to never touch it or pick it.
It never failed that in every group, after all of warnings, at least one kid would pick a handful of it, come over to me and ask "Is this poison ivy?" Of course, when I said "yes," they'd scream and throw the stuff down and yell "Why didn't you tell me!???" Then we'd have a demonstration on how to wash after touching poison ivy.
Edited by GardenerGal - 6/19/12 at 3:08pm