36c. Symphyotrichum laeve (Linnaeus) G. L. Nesom var. concinnum (Willdenow) G. L. Nesom, Phytologia. 77: 283. 1995.
Aster concinnus Willdenow, Enum. Pl. 2: 884. 1809; A. laevis Linnaeus var. concinnus (Willdenow) House
Leaves: basal withering by flowering, linear-lanceolate to linear, slightly auriculate-clasping, often more than 5 times as long as wide. Phyllaries strongly unequal, apical green zones diamond-shaped. 2n = 48.
Flowering Sep–Oct. Dry open woods, mostly on Piedmont and in mountains; 50–1000 m; Ala., Del., D.C., Fla. Ga., Ky., Md., Miss., N.C., Pa., S.C., Tenn., Va., W.Va.
The range of var. concinnum overlaps little with that of var. laeve, being confined to the eastern side of the Appalachian Mountains and to the Piedmont. When subsp. laeve is recognized, var. concinnum belongs to Symphyotrichum laeve subsp. concinnum (Willdenow) Semple & Brouillet.