Involucres 4–7 mm. Rays 12–17. Disc florets ca. 17–22. 2n =18.

Flowering Aug–Sept. Dunes and sandy pockets in rocks by ocean, edges of brackish marshes; 0–20(–200) m; N.B., Nfld. and Labr. (Nfld.), N.S., Ont., P.E.I., Que.; Conn., Del., Ill., Maine, Md., Mass., Mich., N.H., N.J., N.Y., Ohio, Pa., R.I., Va.

Subspecies sempervirens is introduced in Illinois, Michigan, Ohio, and Ontario near salt mines and brackish waters down stream. It grows along the coast from Newfoundland to New Jersey and locally to Virginia.