– Oregon ash
Distribution: Occurring chiefly west of the Cascades crest but also east in the Columbia River Gorge in Washington; southwestern British Columbia to California.
Habitat: Forest edge, thickets, prairie margins, and fields, generally where moist.
Origin: Native
Flowers: March-May
Growth Duration: Perennial
– green ash
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to Oregon, east to Idaho and Montana; native to central and eastern North America.
Habitat: Riparian zones where soil is moist but not saturated.
Origin: Introduced from central and eastern North America
Flowers: April-June
Growth Duration: Perennial