الفهرس 
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Abstract
The present study provides a detailed description of the floristic and ecological features of the main habitat types with special reference to the economic potentialities of some weeds growing naturally in El-Dakahlyia Governorate. In eight districts belong to El-Dakahlyia Governorate, three habitat types namely; Deltaic Mediterranean coast, cultivated land and canal and canal bank habitats were recognized.Two hundreds and seven sampled stands were selected to represent the main habitat types in the study area.The vegetation structure of the study area is classified by using multivariate techniques (classification and ordination). The economic potentialities of ten selected species grow naturally in El-Dakahlyia Governorate have been studied. These species are Cyperus difformis, Cyperus capitatus, Schoenoplectus litoralis, Sesbania sericea, Bidens pilosa, Mentha longifolia, Paspalidium geminatum, Digitaria sanguinalis, Leptochloa fusca and Calligonum polygonoides. Moisture content, dry matter, total ash content, crude protein, crude fat, crude fiber content, total soluble sugars, glucose, sucrose, polysaccharides, nutritive value, quantitative analysis of amino acids and fatty acids as well as some elements were estimated in the studied plants to evaluate their forage potentialities as non-conventional crops or used as a raw materials for various uses in industrial and pharmaceutical purposes.