Symphyotrichum hendersonii

Symphyotrichum hendersonii (formerly Aster hendersonii) is a species of flowering plant in the family Asteraceae native to the northwestern United States.

Commonly known as Henderson's aster, it is a perennial, herbaceous plant that may reach 70 to 150 centimeters (2 to 5 feet) tall.

Its flowers have purple ray florets and yellow disk florets.

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Isotype of Aster hendersonii stored at the Harvard University Herbarium . Collected 5 August 1894 at the Saint Maries River , Kootenai County, Idaho .