Poison ivy is a type of allergenic plant in the genus Toxicodendron native to Asia and North America. Formerly considered a single species, Toxicodendron radicans, poison ivies are now …

May 15, 2024 · Poison ivy rash is caused by an allergic reaction to an oily resin called urushiol (u-ROO-she-ol). This oil is in the leaves, stems and roots of poison ivy, poison oak and poison …

May 22, 2025 · Fluid from poison ivy blisters does not contain urushiol and cannot cause a rash. The rash doesn’t spread; it just erupts at different times based on the amount of urushiol, the …

May 5, 2023 · Poison ivy is a common poisonous plant that causes an itchy skin rash. Other rash-inducing poisonous plants include poison oak and poison sumac. These plants produce an oily …

Sep 21, 2015 · While a number of Iowa plants can be harmful to eat, only a handful cause allergic reactions when we touch them. The most common culprits are poison ivy, wild parsnip and …

Oct 25, 2025 · Poison ivy, poison oak, and poison sumac are allergenic plants with an oil called urushiol. This oil typically causes an itchy, inflamed rash.

Poison Ivy (Toxicodendron radicans) plants are easily the most abundant native woody vine on our campus. Ivy flourishes around the lake and in the forest wood line. The less common …

Poison ivy is found throughout much of North America as a vine or small shrub. It usually has leaves in groups of 3, leading to the adage, “Leaves of three, let it be.” The poison ivy vine will …

Jul 16, 2025 · A poison ivy rash occurs when a person comes into contact with the leaf and/or internal parts of the stem or root. It typically develops within 24 to 48 hours of exposure, …

Apr 1, 2025 · Poison ivy can cause a painful and itchy rash. Keep reading to learn the best poison ivy rash treatment and prevention strategies to help you recover quickly and avoid future …