Boltonia latisquama A. Gray, Amer. J. Sci. Arts, ser. 2, 33: 238. 1862

Heads 30–50(–100); bracts linear-oblanceolate to narrowly oblanceolate or linear-subulate, 25–70 × 2–7 mm. Involucres 4–5 × 6–14 mm. Phyllaries sometimes reflexed, spatulate to obovate-spatulate, subequal, membranous margins broad, (2–)2.5–6 mm wide, apices cuspidate; outer 2.6–3.8 × 0.5–1.6 mm; inner 3.2–4 × 0.9–1.5 mm. Cypselae obovoid to obcordiform, winged; pappus awns 0.7–2 mm, lengths ² / 3 + cypselae. 2n = 18.

Flowering Aug–Sep. Marshes, streams, sloughs, wet ditches; 10–400 m; Ark., Conn., Iowa, Kans., Maine, Md., Mass., Minn., Miss., Mo., Nebr., N.Dak., Ohio, Okla., R.I., S.Dak., Vt., Va., Wis.

Variety latisquama is considered endangered in Maryland.