Bidens cernua Linnaeus. Nodding Bur-marigold. Phen: Aug-Oct. Hab: Marshes, wet meadows, bogs, ditches. Dist: Circumboreal, south in North America to GA, AL, LA, NM, AZ, and CA.

Origin/Endemic status: Native

Synonymy: = Ar, C, FNA21, G, GrPl, GW2, Il, K1, K3, K4, Mi, NE, NY, Ok, Ok, Pa, RAB, S, SE1, Tn, Va, W; < Bidens cernua L. – Oh3; > Bidens cernua L. var. cernua – F, Sherff & Alexander (1955); > Bidens cernua L. var. elliptica Wiegand – F; > Bidens cernua L. var. integra Wiegand – F; > Bidens cernua L. var. minima (Huds.) Pursh – F; > Bidens cernua L. var. oligodonta Fernald & H.St.John – F

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