The essential oils of Acorus Calamus LINN. var. angustatus BESS., collected from several localities in Japan, were examined. The yields of the essential oil were 0.24-0.48% from the leaves and rhizomes, 0.10-0.31% from the leaves, and 1.18% from the rhizomes. The oils consisted chiefly of β-asarone(20.5-75.6%) and cis-methylisoeugenol (2.4-48.9%), with the following minor components : Methyleugenol, eugenol, trans-methyl-isoeugenol, elemicine, sekishone, cis- and trans-isoelemicine, and asarone as the phenol ethers ; α-pinene, camphene, β-pinene, limonene, 1, 8-cineole, p-cymene, linalool, terpinen4-ol, α-terpineol, α-ylangene, β-elemene, β-gurjunene, δ-cadinene, calamenene, calacolene, epishyobunone, isoshyobunone, and shyobunone as the terpenoids, and some other compounds.
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