J.  Valdes-Reyna and Cordero, I. Cabral, ?Chorology of Mexican Grasses?, in Biological Diversity of Mexico: Origins and Distribution, T. P.  Ramamoorhty, Bye, R., Lot, A., and Fa, J., Eds. New York: Oxford University Press, 1993, pp. 439-446.

G.  Second, ?Geographic origins, genetic diversity and the molecular clock hypothesis in the Oryzeae?, in Genetic differentiation and dispersal in plants, P.  Jacquard, Ed. Heidelberg: Springer-Verlag, 1985, pp. 41-56.

H. H.  Iltis, ?Maize evolution agricultural origins?, in Grass sytematics and evolution, T. R.  Soderstrom and al, et, Eds. Washington DC.: Smithsonian Institution Press, 1987, pp. 195-216.

J. M. J.  de Wet, ?Origins of polyploids?, in Polyploidy, Biological Relevance, W. H.  Lewis, Ed. New York and London: Plenum Press, Submitted, pp. 3-15.

H. E.  Connor and Edgar, E., ?Austalasian alpine grasses: diversification and specialization?, in Flora and Fauna of Alpine Australasia, Ages and Origins, B. A.  Barlow, Ed. Canberra: CSIRO, 1986, pp. 413-434.