Essential oil composition of two new species of Phebalium (Rutaceae) from north-eastern NSW, Australia.

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%), beta-phellandrene (5.2-10.8%), beta-eudesmol (6.1-10.0%), hedycaryol (4.5-9.8%), and delta-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%), beta-phellandrene (0.5-14.8%), delta-3-carene (8.0-11.5%), beta-eudesmol (6.7-9.1%), hedycaryol (7.4-9.7%) and alpha-pinene (7.1-8.9%). This is the first report of the volatile components of these two new species.