P. phoenicolepis n=10 ref King et al. 1976 (NOTE - Robinson et al. 1989 correct the identification of the voucher for the count in King et al. 1976 of n=ca 17 for P. phoenicolepis to Ageratina subinclusa)

P. schultzii n=10, ca 10 ref Robinson et al. 1989

References

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.

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.

BLT 1997, Turner, B. L. 1997. The Comps of Mexico. Eupatorieae. Phytologia Memoirs Vol. 11.