Abstract The composition of the volatile oil obtained from the hydrodistillation of the leaves of Psidium guajava L., growing in Nigeria, was studied by GCâMS. Fortyâtwo compounds, representing more than 90% of the volatile mixture, were identiï¬ed. The signiï¬cant compounds were limonene (42.1%) and Î² âcaryophyllene (21.3%). Copyright Â© 2003 John Wiley &amp; Sons, Ltd.