High Richness of Vascular Plants in the Tropical Los Tuxtlas Region, Mexico

Abstract

We present an assessment of the recorded vascular plants in the Los Tuxtlas region, in the state of Veracruz, Mexico, an important portion of the humid tropical forest at the northern edge of its distribution. A literature review and the information contained in the two most important databases in Mexico with digitized information for the region report 2,548 species, of which 2,391 are native and 157 naturalized (exotic). The families with the highest number of species are Fabaceae, Orchidaceae, Asteraeae, and Rubiaceae. The composition of the flora is analyzed, and its similarity is compared with other tropical regions of Mexico. The humid tropical forest in Los Tuxtlas stands out as the site with the third highest number of tropical species in Mexico, and in particular for its high number of endemisms. A quarter of the species occurring in the region are threatened; despite this, the biosphere reserve within its limits plays an important role in the conservation of this type of vegetation.