Youssef, Sami M.A., 1- Department of Recreation and Ecotourism, College of Agriculture, University of Duhok, Sumail-Duhok 1063 BD, Kurdistan Region. 2- Botany and Modelisation of Plant Architecture (AMAP), Université de Montpellier (CIRAD/CNRS/INRA/IRD, TA A51/PS2), 34398 Montpellier Cedex 5, France