Detailed pollen morphology of 81 species belonging to the semi-evergreen tropical forest of the Candelaria River Basin, Campeche is presented. Pollen morphology of some endemic species from the Yucatan peninsula semi-evergree tropical forest are presented: <em>Diospyros cuneata, Croton icche, Acacia gaumeri, Bauhinia erithrocalyx, Calliandra houstoniana, Lonchocarpus longistylus, Trichilia minutifl ora, Coccoloba refl exifl ora, Neomillispaughia emarginata, Randia longiloba, Talisia fl oresii, Thinouia paucidentata and Pouteria amygdalina </em>. Exine ornamentation, structure, apertures, form and size of the pollen grains are included in the description. Details of ornamentation and apertures are illustrated.