As an aspiring naturalist, there aren’t many organisms that I dislike. Bats, rats, weeds, and spiders are all cool in my book ...

It was a close encounter in 2012 that made microbiologist John Jelesko take an interest in poison ivy. The Virginia Tech associate professor was cutting up a downed tree with an electric chainsaw.

Leaves – alternate, trifoliate, 7-10” long, ovate, irregularly toothed, green above but paler on the underside. Twigs – slender, gray to red brown, with aerial roots that become dense and hairy with ...

It’s the time of year for shorts, tank tops, sandals and poison ivy. A single leaf brushing bare skin can be enough to raise a red, blistering, weeping, vacation-killing rash. Poison ivy ...

This plant sends more people to the ER than rattlesnakes! We help you identify poison ivy (toxicodendron radicans). Learn about leaf variations, growth habits, and the dangers of urushiol oil to stay ...

A poison ivy plant appears at Lancaster County Park, in Lancaster, Pa. Botanically known as Toxicodendron radicans, poison ivy contains oily chemical compounds called urushiols in its leaves, stems ...

Toxicodendron refers to a group of plants related to sumac. Most people know at least one of these plants by its common name, such as poison oak or poison ivy. Toxicodendron plants produce an oil that ...

Up until recently, New Englanders had two notorious plants that cause high levels of skin rash and irritation. We are taught early to give wide berth to "leaves of three" in reference to poison ivy.