Bidens aristosa (Michaux) Britton. Midwestern Tickseed-sunflower, Ozark Tickseed-sunflower. Phen: Aug-Oct (-Nov). Hab: Marshes, wet meadows, ditches, bogs. Dist: DE, MD, IL, and MO south to GA, AL, FL (?), and TX (and adventive farther north); the pre-Columbian distribution is uncertain, and portions of the eastern range of the species may be only from, expansion from a more midwestern distribution.

Origin/Endemic status: Native

Synonymy: = C, FNA21, G, GW2, Mi, NE, NY, Oh3, Ok, Pa, RAB, SE1, Tn, Va, W; < Bidens aristosa (Michx.) Britton – Ar, K1, K3, K4, NcTx; > Bidens aristosa (Michx.) Britton var. aristosa – F, Il, S, Sherff & Alexander (1955); > Bidens aristosa (Michx.) Britton var. fritcheyi Fernald – F, Il, Sherff & Alexander (1955); > Bidens aristosa (Michx.) Britton var. mutica (A.Gray) Gatt. – F, Il, S, Sherff & Alexander (1955)

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