Bidens discoidea (Torr. & A. Gray) Britton in Bull. Torrey Bot. Club 20: 281. 1893 Bidens discoidea (Torr. & A. Gray) Britton in Bull. Torrey Bot. Club 20: 281. 1893Taxon for this nameBidens discoidea (Torr. & A. Gray) Britton in Bull. Torrey Bot. Club 20: 281. 1893