Symphyotrichum dumosum (L.) G.L. Nesom
Bushy American-aster, Long-stalked Aster, Rice Button Aster
Bushy asters are North American natives.
Identification: Plants are 12-48" (30-121 cm) high, branching rather sparsely into long branches. Stems vary from hairless at the base to more hairy toward stem tips. Leaves are deep green, alternate, untoothed, and very thin, lanceolate to linear, or narrowly oval to elliptic, 1¼-4" (3.2-10 cm) long. Blooms appear from August to October. There are many flowers, but each tips a separate branch with its own leaflets and they are spread along branches, not clustered at major branch ends. The flowers therefore look evenly distributed, not densely clustered as in most asters. Individual flowers are white or pale blue/purple, ½-¾" (1.3-1.9 cm) in diameter, with 13-30 rays. Central disks are yellow, reddening with age.
Symphyotrichum dumosum on gobotany.nativeplanttrust.org
Symphyotrichum dumosum on hawthornhillwildflowers.blogspot.com
Symphyotrichum dumosum on the Connecticut Botanical Society's Connecticut wildflowers site
Symphyotrichum dumosum at the Lady Bird Johnson Wildflower Center
Symphyotrichum dumosum on Discover Life
Symphyotrichum dumosum on eFloras
Symphyotrichum dumosum description by Thomas H. Kent, last updated 2 Jan 2019.