Bidens frondosa Linnaeus. Phen: Jun-Oct. Hab: Fields, pastures, wet meadows, swamp forests, ditches. Dist: Nova Scotia and AK south to FL, TX, CA, and southward.
Origin/Endemic status: Native
Synonymy: = Ar, C, Fl7, FNA21, G, GrPl, GW2, Il, K1, K3, K4, Mi, NcTx, NE, NY, NY, Oh3, Ok, Pa, RAB, S, SE1, Tn, Va, W, WH3; > Bidens frondosa L. var. anomala Porter – F; > Bidens frondosa L. var. frondosa – F, Sherff & Alexander (1955)