C. grahamii 2n=22 ref Grashoff et al. 1972

C. macrocephala 2n=22 ref Watanabe et al. 2007 (Revealia)

C. pringlei n=12, 2n=24 ref King et al. 1976; Watanabe et al. 2007 (Cronquistia)

C. wislizeni 2n=22 ref Watanabe et al. 2007

References

Gaiser, L. O. 1954. Studies in the Kuhniinae (Eupatorieae). II. Journal of the Arnold Arboretum 35: 87-133.

Grashoff, J. L., M. W. Bierner, and D. K. Northington. 1972. Chromosome numbers in North and Central American Compositae. Brittonia 24: 379-394.

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.

Turner, B. L. 1959. Meiotic chromosome counts for 12 species ot Texas Compositae. Brittonia 11: 173-177.

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.

Watanabe, K., T. Yahara, G. Hashimoto, Y. Nagatani, A. Soejima, T. Kawahara, and M. Nakazawa. 2007. Chromosome numbers and karyotypes in Asteraceae. Annals of the Missouri Botanical Garden 94: 643-654.