[The Sumac Family in the Cascade Mountains of Oregon and Washington]

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

The Genus Toxicodendron

Western Poison Ivy, Western Poison-ivy: Toxicodendron rydbergii (Synonyms: Rhus radicans, Rhus radicans var. rydbergii, Rhus radicans var. vulgaris, Rhus rydbergii, Rhus toxicodendron var. vulgaris, Toxicodendron desertorum, Toxicodendron radicans)

Poison-ivy: Toxicodendron rydbergii

Poison Oak, Pacific Poison-oak: Toxicodendron diversilobum (Synonyms: Rhus diversiloba, Toxicodendron radicans ssp. diversilobum) -

Poison-ivy, Poison Ivy, Western Poison-ivy: Toxicodendron rydbergii (Synonyms: Rhus radicans, Rhus radicans var. rydbergii, Rhus rydbergii, Rhus toxicodendron, Rhus toxicodendron var. vulgaris, Toxicodendron rydbergii) - Occasional in the eastern foothills of the Cascades.

Paul Slichter E-mail