Probable Base Number for Genus x = 10
References
Coleman, J. R. 1970. Additional chromosome numbers in some Brazilian Compositae. Rhodora 72: 94-99.
Dematteis, M., J. Molero, M. B. Angulo, and A. M. Rovira. 2007. Chromosome studies on some Asteraceae from
South America. Botanical Journal of the Linnean Society 153: 221-230.