الفهرس 
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Abstract
The present study provides a detailed description of the floristic features, ecological features and economic potentialities of six species namely, Phragmites australis, Halocnemum strobilaceum, Arthrocnemum macrostachyum, Juncus rigidus, Suaeda vera and Zygophyllum aegyptium, as well as study of some physiological aspects to know the ability of these plants to adapt to the environment in which they grow. The total number of the recorded plant species surveyed in the present study is 82 species belonging to 73 genera and related to 24 families. The family Asteraceae comprises 16 species (19.51%) of the total number of recorded plant species, followed by family Poaceae 15 species (18.29%), and then Chenopodiaceae 10 species (12.19%), Fabaceae comprises 6 species (7.31%). These four families represent the most common flora in the Mediterranean North African flora. The records of plant species are classified into three major groups: 40 annual species (48.78 %), one biennial species (1.22%) and 41 perennial species (50%). According to the description and classification of life-forms in the present study are grouped under seven types. The majority of the recorded species are therophytes (49.41%), followed by chamaephytes (15.29%), then hemicryptophytes (15.29%), geophytes (11.76%), helophytes (3.53%) and nanophanerophytes (3.53%). The lowest value of life-forms is recorded as parasites which attained value of 1.18 %. The vegetation analysis of the plant communities associated with the chosen species in the study area was classified by using multivariate techniques (classification and ordination). The classification technique applied here was the Two-Way Indicator Species Analysis (TWINSPAN), while the ordination technique applied was Detrended Correspondence Analysis (DCA), led to the recognition of four vegetation groups. group A comprises 7 stands codominated by Juncus rigidus and Phragmites australis. group B includes 23 stands codominated by Phragmites australis and Zygophyllum aegyptium. group C comprises 15 stands codominated by Rumex pictus and Erodium laciniatum. group D comprises 18 stands codominated by Zygophyllum album and Halocnemum strobilaceum. sodium adsorption ratio. The economic potentialities of the six selected species have been studied. Moisture content, dry matter, total ash, crude lipid, crude fiber, total nitrogen, crude protein, total soluble sugar, total carbohydrates, tannins, saponins, Phenolics, alkaloids and flavonoids have been estimated in the six studied plants. On the other hand, the macro and micro elements were also determined in all investigated plants. Study the antioxidant activity of the selected plants to determine their importance as antioxidants was studied.The physiological importance of six selected types of naturally growing plants for the study area was also studied in the following aspects: Study of photosynthetic pigments, determination of the activity of antioxidant enzymes, and determination of proline in order to know the ability of these plants to adapt and grow in the environments in which they grow.