Toxicodendron
poison ivy, poison oak
2 species
1 subspecies and varieties
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Toxicodendron diversilobumPacific poison-oak
Distribution: Mainly west of the Cascades in Washington; British Columbia south to California, east to Nevada.
Habitat: Open woods at low elevations.
Origin: Native
Flowers: April-July
Toxicodendron radicanswestern poison ivy
Distribution: Occurring east of the Cascades crest in Washington; throughout much of North America, except Alaska, California, southeastern U.S. and northeastern Canada.
Habitat: Generally in the lowlands and foothills and into the lower mountains in open areas or forest edges.
Origin: Native
Flowers: April-July
var. rydbergii – poison-ivy, western poison-ivy