The essential oils of Grindelia robusta and Grindelia squarrosa were analyzed by GC. The oil of G. robusta was found to contain 141 constituents of which 12 were identified. Bornyl acetate (12.28%) and α-pinene (12.15%) were the major compounds of the monoterpene fraction. The oil of G. squarrosa contained about 100 constituents and showed a very similar composition. α-Pinene (25.53%) was found to be a major compound
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Kaltenbach et al. (1993) studied this question.
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