Toxicodendron vernix, commonly known as
poison sumac, is a woody
shrub or small tree growing to 9 m (30 ft) tall. It was previously known as
Rhus vernix. This plant is also known as thunderwood, particularly where it occurs in the southern US states. All parts of the plant contain a resin called
urushiol that causes skin and mucous membrane irritation to humans. When burned, inhalation of the smoke may cause the rash to appear on the lining of the lungs, causing extreme pain and possibly fatal respiratory difficulty.