Abstract
Essential oils from leaves, stems and roots of Plectranthus barbatus Andr.(Labiatae) were analyzed by GC/MS. The major constituents found were α-pinene (22.2%) in the leaves, β-phellandrene (26.1%) in the stems, and (Z)-β-ocimene (37.6%) in the roots. Although diterpenes were reported previously in this species, this is the first time that manool (1.0%) and abietatriene (0.7%) have been found in the leaf, and roots oils, respectively.
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