الفهرس 
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Abstract
”The present study provides a detailed description of the floristic features including record of the plant species, life-span, life-form spectra and floristic categories of the wild plants associated with the Ochradenus baccatus growing naturally in north sector of Eastern Desert represented by Wadi Hagoul, wadi El-Reshrash and Wadi Al-Atfihi, Floristically, the total number of the recorded plant species surveyed in the present study was 87 species belonging to 70 genera and 27 families. Out of these families, the six major families based on the number of species were Asteraceae, Fabaceae, Poaceae, Chenopodiaceae, Brassicaceae and Zygophyllaceae. These families accounted collectively for about 57.49 % of the total flora of the study area. Based on plant longevity (duration), the flora of the study area (87 species) is composed of 31 annual species (35.63%), two biennial species (2.30%) and 54 perennial species (62.07%). According to the description and classification of life-forms, most of the recorded species are therophytes (37.93%) followed by chamaephytes (32.18%), then hemicryptophytes (13.79%), nanophanerophytes (8.05%), geophytes (4.60%) and phanerophytes (3.45%). The lowest value of life-forms is recorded as helophytes and parasites which attained value of (1.15 %). The present study’s floristic analysis revealed that 67 species (77.02% of all species recorded) are Saharo-Sindian, and 23 species (or 26.44% of all documented species) are taxa from the Mediterranean region. The economic potential of the O. baccatus which are growing naturally in the study area have been studied. The quantitative determination of the secondary chemical constituents (tannins, saponins, flavonoids, alkaloids and phenolics) was determined. The antioxidant activity by using DPPH radical scavenging activity for an assay of the radical scavenging activity of the methanolic plant extracts of the O. baccatus. The MeOH extract of O. baccatus root showed the lowest antioxidant activity with IC50 value of 79.68 mg/ml, while the highest antioxidant activity was obtained from the extract of shoot with IC50 value of 52.15 mg/ml. In this study, the antimicrobial potential of methanolic extracts of O. baccatus parts (root and shoot) exhibited different inhibitory spectrum activities against five Gram-positive bacteria and four Gram-negative bacteria with different degrees as demonstrated by measuring the diameters of inhibition zones developed by the extracts. In this work, the cytotoxic activities of the prepared plant samples extracts were evaluated using an MTT assay. The larvicidal efficiency of O. baccatus was assessed in vitro using Aedes aegypti. Results from this investigation showed a substantial increase in larval mortality at all concentration of O. baccatus methanolic extract.