7BARKLEY T M, BROUII.LET I.,STROTHER J L. Bidens[M]//Flora of North America Editorial Committee, eds. Flora of North America North of Mexico(Vol. 21).New York and Oxford,2006:210 211.
8GANDERS F R, BERBEE M, PIRSEYEDI M. ITS base sequence phylogeny in Bidens (Asteraceae) :evidence for the continental relatives of Hawaiian and Marquesan Bidens[J]. Systematic Botany,2000,25(1):122 133.
