>>4 Yerp. Jewelweed. Words like a gem. (Pun intended.)
It pretty much always grows right near poison ivy. I'm not allergic to poison ivy, but I've used it on my friends, and it works really well. It's just a matter of finding and identifying it. Jewelweed is a purple impatient with yellow dots. Just mash up the leaves and rub them where you got the poison ivy, and it usually clears it up pretty fast.
I found some other remedies, too,
here.
"A paste of baking soda and oatmeal can lessen the itch. Another useful herbal is the buckthorn plant. Also known as plantain, the leaves have a thick, green sap that supposedly soothes the itch for up to 24 hours."