Helianthus angustifolius Linnaeus. Narrowleaf Sunflower. Phen: (Jul-) Sep-Oct (-frost). Hab: Pine savannas, ditches, marshes, other wet habitats. Dist: Primarily Coastal Plain, from Long Island, NY south to c. peninsular FL and west to TX, irregularly inland to OH, IN, and MO.

ID notes:This plant is very showy when in flower on roadsides, especially in Oct. Very rarely the rays are reddened in the basal half (Kelley 2022b).

Origin/Endemic status: Endemic

Synonymy: = Ar, C, Fl7, FNA21, G, GW2, Il, K1, K3, K4, NY, Oh3, Pa, RAB, S, SE1, Tn, Tx, Va, W, WH3, WV; > Helianthus angustifolius L. var. angustifolius – F; > Helianthus angustifolius L. var. planifolius Fernald – F

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