The new leaves are so pretty - if this plant didn't irritate so many people, I know they would be cultivating it. It's pretty in the spring, some have leaves that gorgeous scalloped edges and then the color in the fall is fantastic. Plus the birds adore the berries. But yep, poison ivy.

Anything with thorns wouldn't be poison ivy poison sumac poison oak. That being said have you tried Benadryl to calm the itch? It may be simply that you're allergic to one of the planta or something in the area.

no PI in the first two pix.. cant tell what that thing is.. almost dead center in the 3rd ... not the main vine ... use google images.. to familiarize yourself with a couple million pix of PI .. i gave you a head start below ... ken https://www.google.com/search?q=poison+ivy&biw=864&bih=745&source=lnms&tbm=isch&sa=X&ei=qBWEVfyqB4zutQXByYHwDg&ved=0CAYQ_AUoAQ&dpr=0.9

I have bought, planted, and dug out 2 porcelain vines. The first time was out of fear of it getting loose, after I noticed many volonteer seedlings. The second time, the reason was that it had very little variegation, and I didn't want it spreading again. It can be difficult deciding sometimes whether to keep or discard. One morning I saw a beautiful Rose Breasted Grosbeak eating the berries. It's an emotional push and pull. Do I keep the Ampelopsis for the wildlife, or discard it for the sake of wildlife. Solution.... Native berry producing plants. You can't go wrong, and you sleep better at night.