الفهرس 
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Abstract
The present study provides a detailed description of the floristic features of sand formation habitat type in the Deltaic Mediterranean coastal land of Egypt . The area chosen for the present study is located in the northern part of the Nile Delta region of Egypt which covers the north and middle borders of four Governorates namely: Damietta, El-Dakahlia, Kafr El-Sheikh and El-Behira. The total number of the recorded plant species surveyed in the present study is 92 species belonging to 78 genera and related to 47 families.These recorded species include 45 annuals, one biennials and 46 perennials According to life-forms spectra, the recorded species are mainly therophytes. The floristic analysis of the study area revealed that, 61 species are Mediterranean taxa. The vegetation analysis of sand dunes habitats, led to the recognition of four vegetation groups. Also, The vegetation analysis of sand flat habitat, led to the recognition of four vegetation groups. In sand dunes habitat, the most active soil variables are: clay, water-holding capacity, sodium adsorption ratio (SAR), pH, electrical conductivity (EC), available nitrogen and phosphorus, concentration of sodium and magnesium cations. On the other hand, the most important soil variables which correlate with the distribution of vegetational groups in sand flat habitat are: clay, porosity, pH, electrical conductivity (EC) and organic carbon. The economic potentialities of three species (Cakile maritima, Calligonum polygonoides and Zygophullum album) which are growing naturally in the study area have been studied. Moisture content, dry matter, total ash content, crude lipid content, crude fiber content, total nitrogen content, crude protein, total soluble sugar, glucose, sucrose and polysaccharides have been estimated in root and shoot of the three studied plants. On the other hand, the elementary analysis (macro and microelements) were also carried out in all the investigated plants. The quantitative determination of the secondary chemical constituents (tannins, saponins, flavonoids, alkaloids and phenolics) have been determined.The antimicrobial and allelopathic activities of the three studied species are examined.