Symphyotrichum adnatum (formerly Aster adnatus) is a species of flowering plant in the family Asteraceae native to the southeastern United States and the Bahamas. It is a perennial, herbaceous plant that may reach 30 to 120 centimeters (1 to 4 feet) tall with flowers that have lavender ray florets and yellow disk florets. The common name scaleleaf aster has been used for this species.