The book aimed to study the effect of soil variables and climatic conditions on the composition of and bioactive compounds essential oils from Deverra tortuosa in the coastal desert (West Alexanderia.) and inland desert (Wadi Hagul), Egypt. Thirty seven species were recorded associated with D. tortuosa in both habitats of which 32 were recorded in the coastal desert and fifteen species in inland desert. In the Western Mediterranean Coastal desert, where climate is semi-arid. GC/MS allowed the identification of ninteen compounds in the pet.ether fraction of D. tortuosa, which were...