Symphyotrichum phlogifolium (formerly Aster phlogifolius) is a species of flowering plant in the family Asteraceae native to the eastern United States. Commonly known as thin-leaf late purple aster, it is a perennial, herbaceous plant that may reach heights between 50 and 130 centimeters (1+3⁄4 and 4+1⁄4 feet). Its flowers have light to dark reddish-purple ray florets and white disk florets with purple triangular lobes.

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