**2.1 Identification of types of plant formations, choice and location of study sites**

Identification of types of plant formations, choice and location of study sites. Surveys of the study areas were carried out between June and September 2019 and between January and May 2020. It consiste of locating the main well preserved dry vegetation allowing to have the maximum number of endemic or native species. The choice of study sites was based on bibliographic information, stratification of various maps and direct field observations. Some criteria were taken into consideration (**Figure 2**):


Other very degraded dry plant formations (forests and thickets) were also visited in order to maximize the number of plant species.
