@article {8320, title = {ITS sequences and phylogenetic relationships in Bidens and Coreopsis (Asteraceae)}, journal = {Syst. Bot}, volume = {24}, year = {1999}, month = {1999///}, pages = {480 - 493}, author = {S.C. Kim and D.J. Crawford} } @article {7237, title = {Comparative capitular morphology and anatomy of Coreopsis L. and Bidens L. (Compositae), including a review of generic boundaries}, journal = {Brittonia}, volume = {47}, year = {1995}, month = {1995///}, pages = {61 - 91}, author = {M. Tadesse and D.J. Crawford and E.B. Smith} } @article {7091, title = {A cladistic analysis of morphological features in Bidens L. and Coreopsis L. (Asteraceae-Heliantheae) with notes on generic delimitation and systematics}, journal = {Biol. Skr}, volume = {54}, year = {2001}, month = {2001///}, pages = {85 - 102}, author = {D.J. Crawford and S.C. Kim} } @article {6892, title = {Phylogeny of eastern North American Coreopsis (Asteraceae-Coreopsideae): insights from nuclear and plastid sequences, and comments on character evolution}, journal = {Amer. J. Bot}, volume = {92}, year = {2005}, month = {2005///}, pages = {330 - 336}, author = {D.J. Crawford and M.E. Mort} }