Verbatim text: Sherff, E. E. 1937. The genus Bidens. Publ. Field Mus. Nat. Hist., Bot. Ser. 16.
Author: Sherff, E.E.
Year: 1937
Title: The genus Bidens
Journal: Publ. Field Mus. Nat. Hist., Bot. Ser
Volume: 16