The essential oils of the leaves of Hyptis suaveolens (L.) Poit collected from two different sources were isolated by hydrodistillation. The oils were analysed by GC and GC-MS; 36 constituents were identified in the oil of sample collected from the campus of Lagos State University (LASU), while 33 constituents were identified in the oil of sample from Obafemi Awolowo University (OAU). α α α α α-Pinene (13.6%), sabinene (13.2%), p-cymene (11.7%), terpinen-4-ol (9.8%) and terpinolene (6.3%) were the major monoterpenes in the LASU oil sample, while sabinene (30.0%), terpinen-4-ol (11.4%), terpinolene (5.6%), 1,8-cineole (5.2%), β β β β β-pinene (4.4%) and α α α α α-terpinene (4.2%) were the main monoterpenes in the OAU oil sample. β β β β β-caryophyllene (5.1-5.9%) and trans-α α α α α-bergamotene (1.6-5.2%) represented the major sesquiterpenes in both oils.

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Aims: The aim of the present study is to report the volatile compounds identified in the essential oils obtained by hydrodistillation from the various parts of B. orellana. Study Design: The design includes the extraction of essential oil from air-dried leaves, seeds, seed-pods and stems samples of B. orellana and the determination and identification of the chemical constituents of the oils. Place and Duration of Study: Mature leaves, seeds, seed-pods and stems of B. orellana were collected along LASU-Isheri Road in Alimosho Local Government Area, Lagos State, Nigeria, in May, 2014. Methodology: Air-dried and macerated leaves, seeds, seed-pods and stems of B. orellana were Original Research Articlehydrodistilled in a Clevenger-type apparatus to obtained colourless volatile oil whose chemical constituents was analyzed by GC-FID and GC/MS. Results: A total of twenty-one different compounds were identified, out of which a range of 9-20 constituents were identified, accounting for 91.4-98.1% of the oil samples that are predominantly sesquiterpenes (40.8 -94.9%), except for the seed oil with a higher amount of monoterpenes (45.0%). The leaf oil was characterized largely by α-guaiene (49.3%). The seed oil had α-pinene (29.1%) and β-pinene (14.5%). α-Guaiene (25.0%), spathulenol (12.0%) and caryophyllene oxide (9.7%) were the significant compounds of the seed-pot. The main constituents of the stem oil were caryophyllene oxide (38.8%), β-caryophyllene (22.3%) and myrtenyl acetate (12.5%). Conclusion:The present study shows that the composition of B. orellana essential oils differed from each other and from data reported previously from other parts of the world.