The major sesquiterpenes in the foliage of Dacrydium cupressinum are a-longipinene, longifolene, longibornyl acetate, caryophyllene, caryophyllene oxide, humulene, a- and /3-selinene, /?- and 8-elemene, aromadendrene and the rare 9BH-caryophyllene. Sesquiterpene levels vary greatly from tree to tree. As this variation is largely independent of environmental factors, genetic control is proposed. Longifolene and a-longipinene levels are closely correlated, as are those of caryophyllene and humulene. The biosynthetic implications of these correlations are discussed.