Probable Base Number for Genus x = 10
References
Powell, A. M. and R. M. King. 1969. Chromosome numbers in the Compositae: Colombian species. American Journal of Botany 56: 116-121.
Robinson, H., A. M. Powell, G. D. Carr, R. M. King, and J. F. Weedin. 1989. Chromosome numbers
in Compositae, XVI: Eupatorieae II. Annals of the Missouri Botanical Garden 76: 1004-1011.