|I have lots of this stuff inmy backyard, and it makes me nervous even though it doesn't look like the poison ivy I've always been used to. It doesn't seem to be a vine -- as you can see it isn't clmbing up any of the many available trees/fences/etc. It only grows out of the ground (though from what I can tell the individual plants are connected together via an underground root system).
See my photostream/set at:
www DOT flickr DOT com/photos/89706169@N00/sets/72157618742098114/