Poison Ivy

Toxicodendron radicans (L.) Kuntze



All photographs are copyrighted and are the property of E. Brunner.

Family:  Anacardiaceae

Native or Introduced to Illinois:  native

Natural Habit in Illinois:  Found throughout the state.

Leaf:  Alternate, pinnately compound with 3 leaflets per leaf. Leaves are 7 to 10 inches long. Leaflets are ovate and irregularly toothed. Leaves are shiny above. TOXIC.

Flower:  Small, yellowish, appearing in clusters. Present May to June. TOXIC.

Fruit:  Greenish-white, round, 1/4 inch in diameter, borne in clusters. Present late summer, persisting through winter. TOXIC.

Twig:   Slender, gray-brown in color, lenticellate, sparingly pubescent or glabrous. Older growth becomes densely "hairy" in appearance, covered with aerial roots. Buds are stalked, lack scales, and are pubescent. TOXIC.

Bark:  Difficult to see through the dense aerial rootlets. TOXIC

Size/Form/Shape:   May be present as a low, spreading "carpet" on the forest floor, as a climbing vine, or as a bush.

Distribution for Illinois:   Found throughout the state. 


Information for this page of the Sullivan Middle School Tree Identification Guide obtained from the following sites: