Abstract
The present study deals with the analysis of the floristic composition and plant diversity of Wadi Gimal protectorate. Its major aim is to identify community types and environmental factors that affect their growth and distribution. These quantitative data provide rangers with knowledge that is necessary for monitoring and managing plant communities within the protected areas, as well as restoration of vegetation-depleted habitats. Twenty-seven stands were selected along the length of Wadi and its tributaries. Thirty-five species were recorded in Wadi Gimal; with Poaceae as the dominant family and Phanerophytes dominating over other life forms. Saharo-Arabians were the predominant chorological element. Six vegetation groups were recognized in Wadi Gimal. Zilla spinosa (VG C) which inhabited the Wadi bed had the highest species richness, species turnover, relative evenness and relative concentration of dominance. Capparis sinaica (VG A) which inhabited the mountain slope had the lowest species richness, relative evenness and relative concentration of dominance, while Salvadora persica group had the lowest species turnover. Phoenix dactyliferaHyphaene thebaica (VG F) which dominated the deltaic part of Wadi, had the highest salinity; whilst Acacia ehrenbergiana (VG E) which dominated the upper-stream part of the Wadi had the lowest value of salinity.