Botanically known as Toxicodendron radicans, poison ivy contains oily chemical compounds called urushiols in its leaves, stems and roots. According to the American Skin Association, about 85% of ...

Poison ivy, poison oak, and poison sumac are three ... The leaves are pinnate, meaning they grow in pairs along a central stem, with 7 to 13 leaflets per leaf. The leaflets are elongated, with ...