Probable Base Number for Genus x = 10
G. intermedia n=10 ref Bertasso-Borges & Coleman 1998 (as Eupatorium intermedium)
References
Bertasso-Borges, M. S. and J. R. Coleman. 1998. Embryology and cytogenetics of Eupatorium pauciflorum
and E. intermedium (Compositae). Genetics and Molecular Biology 21: 507-514.
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.