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I updated this article with lit and refs I had. Actually I couldn't do anything with the refs given in the old version of the article:
Eguiluz T. 1982.Clima y Distribución del género pinus en México. Distrito Federal. Mexico.
Rzedowski J. 1983. Vegetación de México. Distrito Federal, Mexico.
Dvorak, W. S., G. R. Hodge, E. A. Gutiérrez, L. F. Osorio, F. S. Malan and T. K. Stanger. 2000. Conservation and Testing of Tropical and Subtropical Forest Species by the CAMCORE Cooperative. College of Natural Resources, NCSU. Raleigh, NC. USA.
Martínez, Maximinio. 1978. Catálogo de nombres vulgares y científicos de plantas mexicanas.
So I left these out. Dick Bos (talk) 09:35, 11 February 2009 (UTC)