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Résumé :
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The leaf oils of the eight Queensland specific and subspecific taxa of Phebalium have been examined. Phebalium distans produced a variable oil, with α-pinene (0.8–42%) being the most abundant prominent monoterpene and bicyclogermacrene (12–22%) as the most significant sesquiterpene. In P. glandulosum subsp. glandulosum by far the major component is dihydrotagetone (75–95%). β-Caryophyllene (9–20%) and bicyclogermacrene (7–23%) were the major components of P. longifolium. In P. nottii the principal monoterpene detected was α-pinene (25–42%), while the principal sesquiterpenes detected were guaiol (t-28%) and bulnesol (nil to 34%). The two monoterpene hydrocarbons, α-phellandrene (12–25%) and β-phellandrene (14–15%), together with bicyclogermacrene (2–12%), elemol/hedycaryol (12–36%) were major components in the leaf oil of P. squamulosum subsp. squamulosum, while in P. squamulosum subsp. gracile, geijerene (4–8%) was present together with α-pinene (44–50%) and guaiol (9–11%). The leaf oil of P. whitei contained α-pinene (22–42%), limonene (1–12%) and bicyclogermacrene (11–20%) as major components. In P. woombye the main components were α-pinene (10–21%), β-phellandrene (12–20%), bicyclogermacrene (11–20%) and germacrene D (5–10%).
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