This study concerns the global inventory of the vascular flora of Saint-Honorat island (Lérins archipelago, Alpes-Maritimes, France), as a result of several field trips performed during the spring 2013, due to the PIM Initiative. 272 plant taxa, whom 76 were never mentioned on the island, were censused and these current data are compared to the ancient available ones. The occurrence of 13 rare plants is discussed and a complete list of vegetation types is provided. An analysis of main impacts on flora and vegetation allows us to propose some management measures in order to protect this original insular plant assemblage, which is globally still well preserved.
