An ethnobotanical study was carried out among the population riverine of the Izarène forest to enhance and safeguard ancestral knowledge of medicinal plants used in traditional pharmacopeia for the treatment of dermatological diseases. Using 480 ques
tionnaire sheets, ethnobotanical field surveys were conducted during two campaigns (2013 to 2015). The determination of the different survey media was carried out using stratified probability sampling techniques. The ethnobotanical data were analyzed through the calculation of quantitative indices, such as Relative Frequency of Citation (RFC), Family Importance Value index (FIV), Fidelity Level (FL),
Informant Consensus Factor (ICF), and the use-value of the Plant Part (PPV). The results show 62 useful plant species, belonging to 34 botanical families. The Lamiaceae family was the most represented (8 species, FIV= 0.037). The highest Relative Citation Frequency (RFC) (0.137) was recorded for Olea europaea L. Concerning the diseases treated, cosmetic use has the highest ICF (0.96), the leaf was considered to be the most used part of the plant (PPV=0.34) and the majority of the remedies were prepared under the form of a poultice. The results obtained could constitute a basis for further studies for the valorization of medicinal plants used against dermatological diseases through biological and phytochemical studies of the inventoried plants.
