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The composition of the essential oil from the leaves and flowers of Monarda citriodora var. citriodora was analyzed by GC and GC/MS. Thymol was the dominant component in the oil from both the flowers (61.77%) and leaves (50.69%). The second most imprtant compound of the leaf oil was p-cymene, although yield from the flower oil was lower (4.19%). A more abundant component of the flower oil was γ-terpinene (13.30%), but only a trace of this was detected in the oil from leaves.
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Collins et al. (1994) studied this question.
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