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2a. Symphyotrichum tenuifolium (Linnaeus) G. L. Nesom var. tenuifolium
Plants 40–60(–100) cm, colonial; long-rhizomatous. Stems 1. Mid leaves (1.5–)3–6 mm wide. Involucres 6–9.5(–11) mm. Phyl-laries lanceolate to subulate. Ray florets (12–)17–25. Disc florets 25–45(–54); corollas (4–)4.7–6(–6.8) mm. Cypselae 2.8–4(–4.5) mm; pappi 5–6.1 mm. 2n = 10.
Flowering Jul–Nov. Coastal salt marshes, brackish marshes; 0–10 m; Ala., Conn., Del., Fla., Ga., La., Maine, Md., Mass., Miss., N.H., N.J., N.Y., N.C., R.I., S.C., Tex., Va.
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