Poison Ivy and Poison Oak in the Cascade Mts.

Poison Ivy and Poison Oak in the Cascade Mountains of Oregon and Washington

The Genus Toxicodendron

Poison Oak, Pacific Poison-oak: Toxicodendron diversilobum (formerly Rhus diversiloba) -

Poison Ivy, Western Poison-ivy: Toxicodendron rydbergii (formerly Rhus radicans) -

Paul Slichter E-mail