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The floristic composition and the distribution of families, genera, and species of vascular plants of the fir forest of Cerro Tláloc, on the northern Sierra Nevada, were analyzed. In an altitudinal range from 3,000 to 3,500 m, the largest possible number of vascular plants was collected during 16 months. There were 44 families, 94 genera, and 137 species. Three fourths of the species belong to only 15 families, among which Asteraceae, Poaceae, Scrophulariaceae, Geraniaceae, Onagraceae, and Pinaceae stand out. Most families and genera have a wide distribution; approximately 88% of the species are exclusive of the Americas, among which 32% are endemic to Mexico and 31% to Mexico-Central America. Only 6.6% of the species are exotic, suggesting changes in the floristic composition of the fir forest as a consequence of human activities.

Composición y patrones de distribución geográfica de la flora del bosque de oyamel del Cerro Tláloc, México