Botanical information about Toxicodendron, from Botanical.com

Botanical, toxicological and ethnobotany information, with photographs, on Toxicodendron diversilobum and other related and unrelated plant species containing the toxin urushiol.

Photograph of poison ivy.

Description, uses, care and control (with photos)

Eastern poison-oak. Information on taxonomy, botanical and ecological characteristics, geographic distribution, fire ecology, and management.

Photograph of poison sumac growing in Michigan.