This study was conducted in the Badénou protected forest, at the periphery and nearby the villages of Tiébila and Nafoun. The Badénou classified forest is exposed to imminent deforestation by local populations. This study aims to determine the floristic diversity of the western peripheral part of this forest. The data was collected using floristic inventories. Floristic diversity was assessed by determining species richness, number of genera and families, Shannon-Weaver diversity and Piélou equitabilty indices. The study identified 243 species grouped into 161 genera and 60 families. This flora contains 147 herbaceous species grouped into 92 genera and 34 families. The woody species, numbering 96, belong to 72 genera and 30 families. The Shannon-Weaver diversity index (3.76) showed an average diversity of woody flora. The Piélou equitabilty index (0.82) reflects an almost equitable distribution of woody individuals between species. The results of this study contributed to take stock of the flora of this forest.