Probable Base Number for Genus x = 10
References
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.