Lee, J., Baldwin, B.G.; Gottlieb, L.D. 2003. Phylogenetic relationships among the primarily North American genera of Cichorieae (Compositae) based on analysis of 18s-26s nuclear rDNA its and ETS sequences. Systematic Botany. 28(3): 616-626.

Lee, J., Baldwin, B.G.; Gottlieb, L.D. 2003. Phylogenetic relationships among the primarily North American genera of Cichorieae (Compositae) based on analysis of 18s-26s nuclear rDNA its and ETS sequences. Systematic Botany. 28(3): 616-626.