Bidens beckii Torrey ex Sprengel. Phen: Jul-Oct. Hab: Aquatic in calcareous lakes and swamps. Dist: NS west to SK, south to n. NJ, PA, n. OH, n. IN, IL, and IA.
Origin/Endemic status: Native
Taxonomy Comments: This species is sometimes treated in the monotypic genus Megalodonta; this is contradicted by molecular evidence, which shows B. beckii as a component of Bidens (Ganders 2000).
Other Comments: See Roberts (1985) for detailed information on this species.
Synonymy: = C, FNA21, G, K3, K4, Mi, NY, Pa; = Megalodonta beckii (Torr. ex Spreng.) Greene – F, Il, K1, Oh3, Roberts (1985); > Megalodonta beckii (Torr. ex Spreng.) Greene var. beckii – Sherff & Alexander (1955)