Boltonia asteroides (L.) L'Hér.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Plants 3–15(–20) dm, with or without rhizomes; lvs broadly linear to lanceolate or narrowly lance-elliptic, reduced upward, the larger ones 5–15 cm × 5–20 mm; infl commonly corymbiform, somewhat leafy, the lvs narrow, at least some of them over 1 cm; invol bracts ± imbricate; rays white to pink, purple or blue, (5–)8–15 mm; disk mostly 6–10 mm wide, with fewer than 200 fls; achenes evidently wing-margined; pappus-awns usually well developed, (0.2–)0.6–2 mm; 2n=18, 36. Moist or wet places; N.J. to Fla., w. to N.D., Okla., and Tex.; escaped and locally established elsewhere. July–Oct. Three vars.