Leaf Essential Oils from 'Philotheca' Species (Rutaceae) in Queensland and Northern New South Wales

The leaf oils of the species of 'Philotheca' growing in Queensland and northern New South Wales have been examined by combined GC and GC/MS. 'Philotheca cuticularis', both subspecies of 'P. difformis', 'P. glasshousiensis', 'P. myoporoides' subsp. 'myoporoides', 'P. epilosa', 'P. obovata', 'P. queenslandica' and 'P. sporadica' all produced leaf oils in which the major component (>75%) was α-pinene. In 'P. acrolopha', the major components were α-pinene (34-42%) and β-caryophyllene (12-22%), while in 'P. ciliata' the principal components were α-pinene (48-54%) and camphor (18-25%). In 'P. ericifolia' the major components were α-pinene (16-25%), myrcene (7-10%), (E)-β-ocimene (18-34%) and the sesquiterpene spathulenol (13-21%). 'Pilotheca conduplicata' produced a monoterpenic oil in which the main components were α-pinene (27.2%), limonene (43.8%) and (E)-β-ocimene (18.3%). In 'Philotheca papillata' α-pinene (43.0%), camphene (9.3%) and elemol (8.8%) were the principal components of the leaf oil. The leaf oil of 'P. salsolifolia' subsp. 'salsolifolia' contained α-pinene (31.9%) and spathulenol (18.1%) as its major components, while in 'P. salsolifolia' subsp. 'pedicellata' sabinene (38%) and bicyclogermacrene (15.2%) were the major components.