Poison ivy

This plant that is well known for its production of urushiol, a clear liquid compound found within the sap of the plant that causes an itching, irritation and sometimes painful rash in most people who touch it. The plant is not a true ivy. Poison ivy can be found growing in any of the following forms: as a trailing vine that is 10–25 cm (3.9–9.8 in) tall; as a shrub up to 1.2 m (3 ft 11 in) tall; as a climbing vine that grows on trees or some other support. The berry-like fruit, a drupe, mature by August to November with a grayish-white color. Fruits are a favorite winter food of some birds and other animals. Seeds are spread mainly by animals and remain viable after passing through the digestive tract.