الفهرس 
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Abstract
The present work deals with the study of the ecology of some wild plants in the Eastern Desert of Egypt as well as its ethno-medicinal uses. The area chosen for the present study is located in the northern part of Eastern Desert of Egypt which covers the two Governorates namely: Cairo and Suez. The total number of the recorded plant species surveyed in the present study is 95 species belonging to 81 genera and related to 27 families. the family Asteraceae comprises 22 species (23.16%) of the total recorded plant species, followed by family Poaceae10 species (10.52%), Brassicaceae and Chenopodiaceae seven species each (7.37%), Fabaceae six species (6.32%), According to the life-form spectra, the majority of the recorded species are therophytes (37.89%) followed by chamaephytes (32.63%) then hemicryptophytes (14.74%), phanerophytes (9.47%) and geophytes (4.21%). The lowest value of life-forms is recorded as helophytes which attained value of 1.10%. The floristic analysis of the study area revealed the 34 species (35.79%) of the total recorded species was belonging to Monoregional Saharo-Sindian element. also that, 28 species or about 29.47 % of the total number of recorded species are Mediterranean taxa. These taxa are either Biregional (15 species =15.79 %), Pluriregional (10 species =10.53 %), or Monoregional (3 species = 3.16 %). The application of TWINSPAN classification on the importance values (out of 200) of 95 plant species recorded in 60 stands representing the study area, led to the recognition of 4 vegetation groups. Group A comprises 4 stands dominated by Launaea nudicaulis. Group B comprises 14 stands dominated by Haloxylon salicornicum. Group C consists of 18 stands codominated by Zygophyllum coccineum. Group D comprises 24 stands codominated by Zilla spinosa. The quantitative of the secondary chemical constituents (phenols, tannins, alkaloids, saponins and flavonoids) of some selected species was carried out to evaluate their ethno-medicinal purposes as raw natural resources. The DPPH free radical scavenging activity of the studied plant extracts were also estimated. The extract of Cleome amblyocarpa showed the highest antioxidant activity with IC50 value 4.11 mg/ml, while the lowest antioxidant activity was obtained from the extract of Diplotaxis harra with IC50 value (12.51 mg/ml). It was investigated that, all studied plant species extracts show different inhibition zone against selected bacterial strain. On the other hand, all the studied plant species are also show different inhibition zone against fungal strain.