Essential oil from leaves of several Labiatae species. The commercial oil is obtained from the cultivated species, Pogostemon cablin (Blanco) Benth. (P. patchouly Pellet. var suavis Hook. f.), Labiatae. Major constituent is patchouli alcohol, q.v., minor constituents include patchoulene, azulene, eugenol, and several unidentified sesquiterpenes: Pfau, Plattner, Helv. Chim. Acta 19, 874 (1936); Naoko et al., Bull. Chem. Soc. Jpn. 40, 597 (1967). Review: E. Guenther, The Essential Oils vol. III (Van Nostrand, New York, 1949) pp 552-575.