Most of us learn to identify this plant as a kid when we first touch it and never forget the horrible itching. Poison ivy has three closely placed leaves and it can be all different shapes and sizes. This is a hard to identify plant but the old saying "leaves of three leave it be" is a good idea. If you do happen to touch poison ivy scrub, scrub, scrub, then scrub some more with soap and water. Be sure you start washing it off your skin immediately.