الفهرس 
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Abstract
The work described in this thesis has been undertaken with the aim of searching for naturally occurring substances of potentially biological activities in Egyptian Flora. Twelve Egyptian wild plants, that are available in Delta region were collected and phytochemically screened. Careful literature survey about them was done. On the basis of the data collected from those sources, four plant species were studied in details. These plants are: i Melia azedarach (Meliaceae). ii Asteriscus schimperi (Asteraceae). iii Centaurea glomerata (Asteraceae). iv Limonium narbonense (Plumbaginaceae). Repeated chromatographic separation and structure elucidation, have resulted in partial separation and identification of sixty five natural products, which could be classified into ten monoterpenoids; eight sesquiterpenoids; two diterpenoids; five tetranortriterpenes; one steroid; one flavonoid; fourteen shikimates; eighteen fatty acids and their derivatives and six miscellaneous compounds. from the isolated compounds, three compounds are new, have not been separated previously from any botanical source.