Leaf Oils of the Australian Species of the Genus Haplostichanthus (Annonaceae)

Abstract

The leaf oils of the six Australian species of the genus Haplostichanthus have been investigated by GC and GC/MS. All produced oil in poor (0.01–0.6%) yields. The leaf oil of Haplostichanthus sp. (Rocky River Scrub, P.I. Forster+ PIF10617) contained caryophyllene oxide (26.2%), humulene oxide (10.1%) and spathulenol (31.6%) as principal components. Haplostichanthus sp. (Mt. Finnigan L.W. Jessup 632) gave a leaf oil in which the principal component was spathulenol (15.4%). The leaf oil of Haplostichanthus sp. (Coopers Creek B. Gray 2344) contained β-caryophyllene (10%), γ-muurolene (12.4%) and bicyclogermacrene (9.6%) as principal components. In the leaf oil of Haplostichanthus sp. (Johnstone River L.W. Jessup+ 471) β-caryophyllene (trace-27%), α-humulene (trace-10%), caryophyllene oxide (3–19%) and spathulenol (6–31%) were the major components. Haplostichanthus sp. (Topaz L.W. Jessup 520) gave a leaf oil in which the principal component was spathulenol (24–38%). The leaf oil of H. johnsonii contained spathulenol (21–36%) as its principal component.