CONTRIBUCIÓN AL CONOCIMIENTO FLORÍSTICO DE LA SIERRA DE ÁLVAREZ, SAN LUIS POTOSÍ, MÉXICO

Abstract

A floristic study was done in nine
oakwoodland stands from the Sierra de
Álvarez, San Luis Potosí, characterized by
having diverse ecological and edaphological
composition. Plots of 100 m2 separated 50 m
each other were located along the
environmental gradient in each stand.
Botanical samples of the whole range of
species were collected, processed. Identified,
and stored in the herbarium of the Instituto de
Investigación de Zonas Desérticas. The
presence or absence for a given species in the
nine stands was counted as constant, accesory
and accidental. From this study the dominant
families were Asteraceae, Fabaceae, Poaceae,
Lamiaceae, Rosaceae and Fagaceae. New
species without previous geografical record
are listed for San Luis Potosí. Comparing the
studied oakwoodland in San Luis Potosí,
there were similarities and differences with
respect to physiography, climate, edaphology,
geology, floristic composition and dominance
of species, with those found in Baja
California, Nuevo León, Durango, Nueva
Galicia, Aguascalientes, Querétaro, Hidalgo,
Michoacán y Chiapas