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The hydrodistilled oils from the aerial parts of Genista numidica and G. saharae, which are endemic to Algeria, were analyzed by Gas Chromatography-Mass Spectrometry (GC-MS). Sixty nine compounds in the oil of G. numidica representing 87% of the total oil and 58 compounds of G. saharae, representing 91% of the total oil were identified. The analysis showed that the main constituents of the essential oils are rich in fatty acid. The major constituent are lauric acid (9.1-8.4%), myristic acid (13.5-14.5%), palmitic acid (15.3-32.3%) and linoleic acid (0-2.4%). The effects of these oils on the growth of Escherichia coli (ATCC 25922), Pseudomonas aeruginosa (ATCC 27853) and Staphylococcus aureus (ATCC 25923) were investigated by the diffusion method. The oils showed no significant antibacterial activities.
