Poison ivy identify In different states, there are different types of poison ivy and oak. And many places have none of these nasty plants. So we created some . - How to Identify Poison Oak. Hiking or being in nature is enjoyable, but exposure to poison oak causes a very itchy, blistery rash that will quickly .The leaves of this plant look a lot like oak leaves, and like poison ivy, they usually grow in c.ers of three. But some kinds of poison oak have five, seven or nine leaves per c.er. Poison oak usually grows as a shrub in the Southeast or along the West Coast. It bears c.ers of greenish yellow or white berries..