Podostemaceae of the Phou Khao Khouay National Park and adjoining areas (PKK Area) in Lao PDR were recorded separate papers, scattered data make it difficult to gain whole picture their diversity evolution. Our literature research enumerated 18 species six genera, which account for 43% 55% genera indigenous Laos, including 13 PKK Area-endemic (72%) three (50%). The richness endemism Area have h...