Helianthus laetiflorus Persoon. Phen: Late Jul-Sep. Hab: Disturbed areas; introduced from farther west. Dist: Widely scattered in e. and c. North America, believed to be a derivative of the hybrid of H. pauciflorus Nuttall ssp. subrhomboideus (Rydberg) O. Spring & E. Schilling and H. tuberosus.

Origin/Endemic status: Native

Synonymy: = G, Pa, RAB, S, SE1, Va, WV; = Helianthus ×laetiflorus Pers. (pro sp.) – C, FNA21, GrPl, Il, K1, K3, K4, Mi, NE, Oh3, Tn; = Helianthus laetiflorus Pers. var. laetiflorus – F; = n/a – NY; ~ Helianthus scaberrimus Elliott

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