Abstract
The compositions of the essential oils isolated from leaves of five natural popu-lations of Cupressus atlantica (Cupressaceae), an endemic species from Morocco, were investi-gated by GC-FID and GC-MS. The analysis showed sixty one constituents, of which fifty seven constituents were identified, accounting for 83.8–95.5 % of the total oils. These oils were domi-nated by the sesquiterpene hydrocarbons; four of them (germacrene D, ô-cadinene, y-cadinene and ß-caryophyllene,) constituted 21- 52.2 % of the oil, except for Talat N’os population which showed a high rate of monoterpene hydrocarbons (41.4 %). Quantitative, rather than qualitative difference of components found in the essential oil was noted. This variation seems to depend on environmental aspects existing in the plant collection sites.
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