Symphyotrichum hallii
Symphyotrichum hallii is a species of flowering plant in the family Asteraceae endemic to western Oregon and Washington states. Commonly known as Hall's aster, it is a perennial, herbaceous plant with a long rhizome that creates colonies of itself. It grows about tall, and has white rays that open July–August.
Most occurrences of the species have been found at elevations of in open areas in the Puget Sound region and Willamette Valley, with outliers in Columbia Gorge and central Washington. It is conservationally Imperiled in Washington state.