Calico aster
(Symphyotrichum lateriflorum)

Formerly Aster lateriflorus; aka goblet aster, starved aster. Flowers are half-inch wide or smaller, white or pale blue, with yellow centers, which turn reddish purple with age. Stem leaves emerge below flowering shoots; leaves are linear and toothed. MC. To see a comparison of our local asters, look here. (Asteraceae)