Abstract The steam-volatile constituents of Humulus Lupulus L. var. cordifolius Maxim, have been studied, and 66 compounds of the oil have been identified. Besides the previously-reported principal hop components (myrcene, β-humulene, caryophyllene, β-selinene, δ- and γ-cadinenes), evidence was found for the presence in an abnormally high concentration of others: zingiberene, α-curcumene together with β-bisabolene, and β-sesquiphellandrene, selina-3,7(11)-diene, and selina-4(14),7(11)-diene. A number of oxygenated sesquiterpenoids were detected. The major one was found to be caryophyllene-oxide. The isolated components were identified by spectroscopic or chemical means.