Toxicodendron toxicarium
- Eastern poison-oak. Information on taxonomy, botanical and ecological characteristics, geographic distribution, fire ecology, and management.
- http://www.fs.fed.us/database/feis/plants/vine/toxdiv/all.html#INTRODUCTORY

Poison Ivy (Toxicodendron radicans)
- Description of the plant, the skin reaction it causes, uses, control, and photos.
- http://www.kingdomplantae.net/poisonIvy.php

Poison Oak
- Botanical, toxicological and ethnobotany information, with photographs, on Toxicodendron diversilobum and other related and unrelated plant species containing the toxin urushiol.
- http://waynesword.palomar.edu/ww0802.htm

Poison Ivy Information
- Botanical information about Toxicodendron, from Botanical.com
- http://www.botanical.com/botanical/mgmh/i/ivypoi17.html