Thesis (M.Sc.) - Cairo University - Faculty of Science - Department of Botany - Microbiology

The vegetation analysis and species distribution at the present study, emphasizing that the environmental factors has an important effect on the plant communities. About 69 species belonging to 56 genera related to 27 families were observed in the studied localities, distributed as follow: South Sinai was represented by one location namely: Feiran Oasis, while the Red Sea coastal desert was represented by three locations name- ly: Shaieb El-Banat Mountain, El-Qusier Wadis and Hanquf Mountain. The mentioned localities dominated by M. peregrina. The floristic analysis recognized that, the most characteristic family was Asteraceae represented by 10 species (14.5%), followed by Fabaceae (8 species = 11.59%). The life forms obtained that; Chamaephytes 26 species (37.7%), followed by Therophytes 25 species (36.2%). Phanerophytes represented by 11 species (15.9%) of the flora were the most frequent, indicating a typical desert life- form spectrum. Chorological analysis revealed the Mono-regional elements contain (40 species = 58%) of the total number of species. The Biregional elements contain 26 spe- cies (37.7%). The Pluriregional elements are the poorly category distinguished in the studied localities contain 3 species = (4.3%). After application of the TWINSPAN, 7 vegetation groups (I-VII) were represented the studied localities, all of them are domi- nated by M. peregrina, while the application of (CCA-biplot) indicates significant asso- ciations between the floristic composition of the studied area and the edaphic factors such as gravels, electrical conductivity, pH, calcium carbonate, cations and anions, also the altitude was most effective factor on the distribution of M. peregrina and the asso- ciated species in the studied localities

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