الفهرس 
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Abstract
The present study deals with ecological and phytochemical investigation of the growing naturally in Abu Tartur plateau, in western Desert of Egypt. Six plant communities were recognized and dominated by Astragalus vogelii, Bassia muricata, Morettia philaena, Alhagi graecorum, Farsetia aegyptia and Schouwia purpurea.>Total number of the recorded species was 56 (12 monocots and 44 dicots), differentiated into 30 perennials and 24 ephemerals. 7 types of life-forms were found with priority of therophytes and chamaephytes (67%). Irano-Turanian, Saharo-Sindian, Saharo-Arabian and Mediterranean were the main floristic categories.The botanical aspects of A. vogelii, B. muricata and Morettia philaena were involve their morphological, anatomical characteristics in addition to seed germination under different environmental conditions.The biochemical examination of the three selected species clearly indicated was higher in Bassia (1.81 ± 0.013 g/ 100g) while the lowest value was that of Astragalus (0.86 ± 0.008 g/ 100g).Polyphenols content is varied between 3.28 and 8.29 g/ 100g.The protein amino acids of A. vogelii include 6 essential amino acids and 7 non-essential amino sacids.GLC analysis of fatty acids content of Bassia and Morettia showed the presence of ten fatty acids in the former species and 12 fatty acids in the latter species.The shoot of A. vogelii showed the highest antioxidant activity.Using the disc diffusion assay method against several pathogenic strains of bacteria. A. vogelii possessed microbial activity against Bacillus subtilis and Candida and B. muricata has activity against Bacillus and Erwina.