Inventario florístico en el cerro Tetzcotzinco, Texcoco, Estado de México

Cerro Tetzcotzinco is an important archeological site and tourist attraction located near Texcoco, State of Mexico. It is a hill of volcanic origin, with steep rocky slopes and an elevation of 2 270-2 600 m. Four plant associations are recognized on the hill, oak woods, grassland, xeromorphic scrub, and aquatic and semiaquatic vegetation. The inventory revealed the presence of 375  species, 234 genera and 70 families of vascular plants, a surprising diversity for an area of 50 ha. The majority of these species are known from the Valley of Mexico, but there were notable discoveries. Outstanding among these are Pavonia pulidoae, a new species, and Thevetia peruviana, a species very little known in the Valley of Mexico.