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The chemical composition of essential oils from the flowering plants of four Tagetes species was examined by GC-MS. Of the species examined only T. rninuta L. was rich in /3-ocimene. The other major constituents of this species and of T. tenuifolia Cav. were dihydrotagetone, tagetone, and (E)-ocimenone. These two species only contained small amounts of (2)-ocimenone but, in contrast, the essential oil of T. patula L. contained equal amounts of (Z)-and (E)-ocimenone. The oil from T. patula also contained limonene and /?-caryophyllene. The essential oil from T. erecta L. differed largely from the other three species containing mainly limonene, /?-caryophyllene, and piperitone. In agar-diffusion experiments the essential oil of T. rninuta inhibited the multiplication of fungi, Gram-positive and Gram-negative micro organisms.
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