The cloud forest of Molocotlán indudes part of two municipalities of the Hidalgo State, Molango and Xochicoatlán, and is located in the Huasteca region in the Sierra Madre Oriental. Arboreal vegetation is divided in three vertical strata: high (20-30 m), medium (8-20 m) , and lower (2 -8 m). The flora of the area includes 391 species, 270 genera, and 112 families. Genera are grouped according to their present distribution in six categories; a high percentaje of them are exclusively American.