Probable Base Number for Genus x = 10
References
Dillon M. and B. L. Turner. 1982. Chromosome numbers of Peruvian Compositae. Rhodora 84: 131-137.
King, R. M., D. W. Kyhos, A. M. Powell, P. H. Raven, and H. Robinson. 1976. Chromosome numbers in Compositae. XIII. Eupatorieae.
Annals of the Missouri Botanical Garden 63: 862-888.
Powell, A. M. and R. M. King. 1969. Chromosome numbers in the Compositae: Colombian species. American Journal of Botany 56: 116-121.
Watanabe, K., R. M. King, T. Yahara, M. Ito, J. Yokoyama, T. Suzuki, and D. J. Crawford. 1995. Chromosomal cytology and evolution in
Eupatorieae (Asteraceae). Annals of the Missouri Botanical Garden 82: 581-592.