Michigan's summer climate provides ideal growing conditions for many flowers and other plants we enjoy — and for a few poisonous, three-leafed plants we all could do without. Though the common phrase: ...

Poison ivy has three leaves, and the middle leaf has a longer stem. Touching poison ivy causes an allergic reaction due to urushiol oil. Poison oak and poison sumac are related to poison ivy and also ...

While those shiny green leaves lining the base of a tree might look harmless, poison ivy isn't anything to mess around with, especially when the results of touching it are an itchy red rash that lasts ...

Poison ivy, oak, and sumac contain an oil called urushiol that causes an allergic skin rash. These plants can be identified by their leaf structure, though some non-toxic plants look similar. To avoid ...

Archaeologists have now found traces of a plant-based poison on several 60,000-year-old quartz Stone Age arrowheads found in ...