Toxicodendron Vernix (Poison Sumac): A woody shrub or small tree growing to 30 feet tall. The plant contains a resin called urushiol that irritates skin and mucous membrane . When irritated, inhalation of the smoke may cause the rash to appear on the lining of the lungs. This causes extreme pain and possibly fatal respiratory difficulty.
Toxicodendron diversilobum (Poison Oak): A woody vine or shrub that is widely distributed in western North America. It causes itching and allergic rashes in many humans, after contact by touch or smoke inhalation.
Toxicodendron radicans (Poison Ivy): A poisonous North American and Asian flowering plant that causes itching, irritating and sometimes painful rash when touched. The rash is caused by urushiol in the sap of the plant, used to help the plant retain water.
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