[Wildflowers of the Columbia River Gorge with 5 Petals]
The Sumac Family in the Columbia River Gorge

Anacardiaceae

Rhus diversiloba
Members of the Sumac Family Found in the Columbia River Gorge:

Poison Oak: Toxicodendron diversilobum (formerly Rhus diversiloba) - Leaves trilobate with rounded, obtuse, or abruptly acute tips. In the Columbia River Gorge, generally found west of The Dalles.

Smooth Sumac: Rhus glabra - Leaves pinnately compound with many leaflets. Small tree, often growing in dense thickets.

Poison Ivy, Poison Oak: Toxicodendron rydbergii (formerly Rhus radicans) - Leaves trilobate with acute or acuminate tips. In the Columbia River Gorge, found east of Tom McCall Park.

Paul Slichter E-mail