الفهرس 
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Abstract
Location map of the study area indicating the main topographic features of the eastern section of the western Mediterranean desert of Egypt External morphology of Helianthemum Lippi External orphology of Plant ago albicans External morphology of Catania dichotomy. Location map of the study area indicating the selected habitats . Variations in the concentration of sugar constituents in the organs of Helianthemum lippie in different habitats . Variations in the concentration of sugar constituents in the organs of Plant ago albicans in different habitats . Variations in the concentration of organic nitrogen in the organs of Helianthemum lipid in different habitats Variations in the concentration of organic nitrogen in the organs of Plant ago albicans in different habitats.