Seven hybrids were produced by the crossbreeding of 'Murcott' tangor with 'Seto unshiu' (Citrus unshiu Marc.) as the pollen parent. Peel oil from fruit-rind tissue was prepared by simultaneous distillation and extraction under reduced pressure. Each peel oil was separated into hydrocarbon and oxygenated-compound fractions in a silica gel column and analyzed by a capillary gas chromatograph-mass spectrometer. The compositions of the hydrocarbon fraction from the hybrids were closer to the composition of 'Murcott' than 'Seto unshiu'. The hybrids had larger hydrocarbon fractions than their parents. The compositions of the oxygenated-compound fractions were different from those of their parents.
