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Vegetation Structure and Diversity of Wadi Wasaa, Jazan, Saudi Arabia

This study is the first report conducted on Wadi Wasaa of Jazan area in Saudi Arabia. Total of 95 species belonging to 75 genera and 31 families were recorded from the study area, Poaceae and Euphorbiaceae both are the dominant families constituted 23% of the total species of the study area followed by Apocynaceae , Malvaceae., Chamaephytes and therophytes were the prevailed life forms, indicating a typical desert life-form spectrum (chameo-therophytic) type, followed by phanerophytes. The chorological analysis revealed a total of 26 species representing 27% fell under monoregional, 56 species (59.0%) as biregional area and four species were detected under pluriregional region. Cover abundance values were visually estimated and used to form ten clusters of plant community types by statistical methods with Euclidian Distance and Ward method using SPSS program (ver.20). The Shannon-Wiener diversity index was used to estimate diversity, richness and evenness of the recorded species where it revealed the highest diversity index (H) was Original Research Article