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Effect of the Parts of Plant Material (Flowers and Leaves) on Essential Oil Chemical Composition of Ormenis mixta from Morocco

Abstract Air-dried aerial parts of wild Ormenis mixta were collected from five different regions of Morocco (Kenitra, Tamesna, Sidi allal lbahraoui, Settat and Benguerir) during 2011. The essential oil obtained separately from the leaves and flowers of O.mixta has been extracted by Clevenger apparatus and analyzed by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS). The flowers gave the most important yield in all the regions. The yield obtained varies greatly with a range of 0.83 to 1.67 % for flowers and 0,56 to 0,86 % for leaves. Significant differences were found in the chemical composition of leaves and flowers. The main components of flowers were camphor (14,4-29 %), trans-β-farnesene (8.3 %) and 2-tridecanone (21.5 %). For the leaves, the major components were trans-nerolidol (44.1 %), β-myrcene (12.4 %) and camphor (11-33 %). Cluster analysis of the essential oil composition from the five populations studied confirmed a major chemical variability.