What is first appearance of poison ivy?

Poison ivy was first identified by the English explorer John Smith in 1609 during his travels in Virginia. However, Native Americans had been aware of the plant's toxic properties for centuries and used it as a traditional medicine. The genus name of this poisonous plant is Toxicodendron radicans and it is a member of the Anacardiaceae family. Its leaves and stems contain a substance called urushiol which causes an allergic reaction, including itching, redness, swelling, and rashes, in most people who come in contact with it. Poison ivy is commonly found in North America and can grow as a vine or a shrub, often climbing up trees or other structures. It is important to be aware of its presence and take precautions when hiking or gardening in areas where it may be found.