El Mokni, Ridha, Department of Pharmaceutical Sciences ‘A’, Laboratory of Botany, Cryptogamy and Plant Biology, Faculty of Pharmacy of Monastir, Avenue Avicenna, Monastir-5000, Monastir University, Tunisia & Department of Forestry, Laboratory of Forest Ecology, National Research Institute of Rural Engineering, Water and Forests, Ariana-2080, IRESA, Carthage University, Tunisia, Tunisia