a floristic study of 14 communities with pinus pinceana gordon was carried out. this species is distributed in small populations along the sierra madre oriental in northern and central mexico. a floristic similarity analysis between localities is included. a total of 446 species (plus 4 infaespecific taxa), 247 genera and 78 families were found. the communities can be separated by its flora into two groups: the northern one, located in coahuila, zacatecas and san luis potosí, and the southern one located in querétaro and hidalgo.
