Fagus mexicana

Fagus mexicana, the Mexican beech or haya, is a species of beech endemic to northeastern and central Mexico, where it occurs from Nuevo León, Tamaulipas south to Hidalgo, Veracruz and Puebla. It is restricted to Tropical montane cloud forests in the Sierra Madre Oriental. It is closely related to the American beech Fagus grandifolia and until recently was frequently treated as a subspecies of it, as Fagus grandifolia subsp. mexicana (Martínez) E.Murray. However, recent research has shown it differs in genetics, lacking some ancient introgression with Eurasian Fagus species which is present in F. grandifolia, as well as in morphology with slenderer leaves and its habitat differences; it is now accepted as a separate species by the Plants of the World Online database....read more on Wikipedia.