Reference:Weedon1973a
Verbatim text: Weedon, R. R. 1973. Taxonomy and Distribution of the Genus Bidens (Compositae) in the North-central Plains States. Ph.D. dissertation. University of Kansas.
Author: Weedon, R.R.
Year: 1973
Title: Taxonomy and Distribution of the Genus Bidens (Compositae) in the North-central Plains States