Poison Ivy Information - Information from Botanical.com on this poisonous plant, wrongly classified as Rhus toxicodendron, its description, constituents, medicinal action and uses. Poison Oak - Botanical, toxicological and ethnobotany information, with photographs, on Toxicodendron diversilobum and other related and unrelated plant species containing the toxin urushiol. Poison Ivy (Toxicodendron radicans) - Description of the plant, the skin reaction it causes, uses, control, and photos. Toxicodendron diversilobum - Eastern poison-oak. Information on taxonomy, botanical and ecological characteristics, geographic distribution, fire ecology, and management. Toxicodendron vernix: Poison Sumac - Photographs and description of this shrub or small tree with toxic sap, and information on its habitat and range. Toxicodendron rydbergii: Western Poison Ivy - Photograph and description of this shrub which secretes a toxic volatile oil, with information on its habitat and range. Toxicodendron diversilobium: Western Poison Oak - Photograph and description of this tree which secretes a toxic juice, with information on its habitat and range. Toxicodendron radicans: Poison Ivy - Photograph and description of this shrub or vine which secretes a toxic volatile oil, with information on its habitat and range. Poison Ivy: Toxicodendron radicans - Student project with classification, habitat, adaptation, nutrition, reproduction and interactions with other species including humans. Toxicodendron diversilobum: Pacific Poisonoak - Fact sheet with photos of the leaf, flower, fruit, twig, bark and form. Toxicodendron pubescens: Poison-oak - Fact sheet with photos of the leaf, flower, fruit, twig, bark and form. Toxicodendron radicans: Poison-ivy - Fact sheet with photos of the leaf, flower, fruit, twig, bark and form.