الفهرس 
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Abstract
The present thesis is aiming at the waste waters usually drain into Rosetta Branch and changes of the vegetation along the Rosetta Branch of the River Nile. Also, determine the factors controlling the distribution and abundance of the plant communities in the study area Fifty sampling quadrats were selected to represent the Rosetta Branch of the River Nile in the five provinces of the study area namely : Kafr El-Sheikh, El-Gharbia, El-Menofyia, El-Behira and El-Qaluobya. Floristically, the total number of hydrophytes and terrestrial bank plants recorded in the present study is 50 species belonging to 40 genera grouped under 20 families. Out of these families, Poaceae (9 species), Asteraceae (8 species), Chenopodiaceae and Cyperaceae (5 species) are the main families being represented collectively by 27 species or about 54.00 % of the total number of the recorded species. According to the life-span, the recorded taxa can be classified under two categories as follows : 1. Annuals : 18 species (36.0%). 2. Perennials: 32 species (64.0%).According to the life-form spectra of the recorded species, the majority of plants are mainly cryptophytes (46.43%) and therophytes (32.14%). Chamaephytes, hemicryptophytes and phanerophytes attain value of about 7.14% each of the total recorded species.