Symphyotrichum estesii is a species of flowering plant in the family Asteraceae, endemic to Coffee County, Tennessee. Commonly called May Prairie aster and Estes's aster, it is a perennial, herbaceous plant that may reach 30 to 85 centimeters (12 to 33 inches) in height. Its flowers have white ray florets and yellow disk florets. It is named in honor of botanist Dwayne Estes who discovered it in 2008.

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