The volatile constituents of Parquetina nigrescens from southwestern Nigeria.

The leaf essential oil of Parquetina nigrescens collected from Badary, Nigeria, was obtained by hydrodistillation and analyzed by gas chromatography mass spectrometry. The essential oil had a simple composition with only five identified components. The oil was dominated by citral (35.0% neral and 53.7% geranial). The high concentration of citral in the essential oil likely contributes to the ethnomedicinal utility and bioactivities associated with this medicinal plant.