Before revision:  Results. The French Mediterranean area is divided into eight statistically significant biogeographical regions that are highly connected spatially . Mediterranean and temperate sub-networks can be distinguished. The three mediterranean bioregions are share an important pool of species, and present a high spatial coherence. The limit formed closely matches the mesomediterranean thermoclimatic belt. The transition area between Mediterranean and temperate systems is represented by the bioregion "mediterranean border" whose northern limit fit the limit of the Mediterranean biome. Main conclusions. The proposed network approach provides a characterization of the biogeographical structure which confirms some previously recognized floristic regions in southern France, while providing more precise insights into the relationships between them .
After revision:  Results. The French Mediterranean area is divided into eight statistically significant bioregions that present a complex spatial structure. Some of them are spatially well delimited, and match with particular geological entities. On the other hand fuzzy transitions arise between adjacent bioregions that share a common geological setting, but are spread along a climatic gradient. The proposed network approach provides a characterization of the biogeographical structure which confirms some previously recognized floristic regions in southern France, while providing more precise insights into the relationships between them .