Leaf Oils of the Australian Species ofPolyalthia(Annonaceae)

The leaf oils of the four Australian species of Polyalthia were examined. P. australis gave an oil in which the major components were p-caryophyllene (4–15%), germacrene D (1–13%), bicyclogermacrene (1–10%), caryophyllene oxide (6–10%) and spathulenol (7–24%). P. michaelii gave an oil with spathulenol (42.2%) as the principal compnent. P. nitidissima appeared to exist in two chemotypes: one in which α-pinene (10–12%), limonene (4–6%) and...