The chemical composition of the essential oils obtained by hydrodistillation from Artemisia campestris L (family Asteraceae) and Juniperus phoenicea L (family Cupressaceae) collected in Djebel Amour (Sahara Atlas, Algeria). Aerial parts were also evaluated by gas chromatography (GC) and gas chromatography coupled to mass spectrometry (GC-MS). The analyses for leaves and fruits of A. campestris resulted in the identification of thirty-one compounds, representing 91.8 % of the total oil and the yields were 0.33% (v/dry weight). The main components were ?-pinene and sabinene (25.6% and 17% respectively) followed by ?-pinene (9.9%), limonene (6.6 %) and p-cymene (4.1%). forty-two compounds were identified in leaves and fruits of J. phoenicea representing 97% of the total oil composition. The yield of essential oil was 0.44 % and the major compound in aerial parts was ?-pinene (75.8%) followed by ?-3- carene (3.4%), linalool (2.7%).
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