Wayne's Word Index Noteworthy Plants Trivia Lemnaceae Biology 101 Botany Search  Neotropical Amber   West Indian Locust   Pseudoscorpion   Midge In Amber   Amber Necklace   Poison Oak Resin   Botanical Jewelry   Drift Seeds & Fruits  Poison Oak: A Resinous Shrub This Resin Contains Urushiol, A Potent Allergen Causing Severe Dermatitis In Sensitive Humans © W.P. Armstrong 31 March 2010 Magnified view of stem cross section of poison oak (Toxicodendron diversilobum) showing showing circular resin ducts (rd) in outer phloem layer (green) just beneath the bark. The resin ducts also contain urushiol, the insidious allergen that causes the painful, itching rash. Go To The Poison Oak Article Return To The New World Amber Article Return To The WAYNE'S WORD Home Page Go To The NOTEWORTHY PLANTS Menu All text material & images on these pages copyright © W.P. Armstrong