Aromatic plants of tropical central Africa. Part XIX. Volatile components from leaves of two lamiaceae from Cameroon: leucas deflexa hook and Solenostemon monostachyus (P.Beauv.) Briq.

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Abstract
The chemical composition of the essential oils isolated by hydrodistillation from leaves of Leucas deflexa Hook and of Solenostemon monostachyus (P.Beauv.) Briq. grown in Cameroon, has been investigated by GC and GC‐MS. The leaf essential oil of L. deflexa was characterized by a high amount of sesquiterpene hydrocarbons (80.3%), germacrene‐D (27.8%), β‐caryophyllene (24.1%) and α‐humulene (9.9%) being the major components. The leaf essential oil of S. monostachyus was more complex; β‐pinene (13.0%), oct‐1‐en‐3‐ol (12.6%), β‐caryophyllene (6.9%), octan‐3‐ol (6.8%) and (E,E)‐α‐farnesene (6.2%) were the most abundant constituents.