Poison ivy is a woody vine that produces a toxic resin called urushiol, which causes intense itchiness and raised rashes when it comes in contact with skin. This plant grows all over the United States and is identifiable by its bright green color and distinctive three-leaf structure. Contact between poison ivy and the skin causes severe dermatitis resulting sometimes in painful rash. The species is variable in its appearance and habit, and despite its common name it is not a true ivy (Hedera), but rather a member of the cashew and almond family. It is commonly eaten by many animals, and the seeds are consumed by birds.
The following websites are some of the best online resources that provide more information about Poison Ivy. You will be directed to the websites by clicking on the respective links.