C. macrocephalum n=10; 2n= ca 10II + 10 I; n=20-22; 2n=20, 2n=40 ref Turner et al. 1967; Turner et al. 1979; Robinson et al. 1989; Dematteis et al. 2007

References

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.

Coleman, J. R. 1970. Additional chromosome numbers in some Brazilian Compositae. Rhodora 72: 94-99.

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.

Turner, B. L., J. Bacon, L. Urbatsch and B. Simpson. 1979. Chromosome numbers in South American Compositae. American Journal of Botany 66: 173-178.

Turner, B. L. A. M. Powell, and J. Cuatrecasas. 1967. Chromosome numbers in Compositae. XI. Peruvian species. Annals of the Missouri Botanical Garden 54: 172-177.