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.