Essential Oil Composition of two New Species of 'Phelabium' (Rutaceae) From North-Eastern NSW, Australia

Abstract

The composition of the essential oil steam distilled with cohobation from the aerial parts of two new undescribed species of 'Phelabium', 'P. stellatum' I. Telford & J.J. Bruhl ined. and 'P. sylvaticum' I. Telford & J.J. Bruhl ined., has been analyzed by gas chromatography and gas chromatography coupled to mass spectrometry. Both species were found to have a similar chemical composition. The essential oil of 'P. stellatum' was characterized by high amounts of elemol (24.6-30.8%), β-phellandrene (5.2-10.8%), β-eudesmol (6.1-10.0%), hedycaryol (4.5-9.8%), and δ-3-carene (4.4-13.7%). The main compounds of the samples of P. sylvaticum were identified as myrcene (10.6-23.0%), elemol (11.3-14.6%), β-phellandrene (0.5-14.8%), δ-3-carene (8.0-11.5%), β-eudesmol (6.7-9.1%), hedycaryol (7.4-9.7%) and α-pinene (7.1-8.9%). This is the first report of the volatile components of these two new species.