Inventario florístico del Parque Nacional Ca？ón del Sumidero, Chiapas, México

a floristic inventory was conducted in the sumidero canyon national park, chiapas, mexico. thirty-three field trips were conducted from 2007 to 2008 and the revision of herbaria data bases. about 1,298 species and 58 infraspecies were recorded among 632 genera and 135 families. the most representative families were fabaceae (126 species with 52 genera) and asteraceae (with 107 species and 65 genera). the most diverse genera were ipomoea (18), tillandsia (17), and peperomia (16). in addition, 625 species were classified as herbs and 1,179 species were terrestrial autotrophic. tropical deciduous forest was the most diverse with 30.91% of the species reported. about 24 species were recorded under some level of threat-risk within the official threatened species list nom-ecol-059-2010 and 2.6% of the flora reported in the sumidero canyon is endemic to chiapas. two species, valeriana palmeri a. gray and dioon sp., are thought possibly extinct in the study area.