Toxicodendron (genus)

Toxicodendron is a genus of plants that includes species like poison ivy, poison oak, and poison sumac. These plants contain a resin called urushiol, which can cause allergic skin reactions such as itching, redness, and blisters in many people. Not everyone reacts to urushiol, but exposure is common through contact with plant oils on the skin, clothing, or tools. Recognizing these plants and avoiding contact can prevent irritation. The plants themselves are often found in forests, meadows, or along trails, and their appearance varies from harmless-looking shrubs and vines to larger, more tree-like forms.