Abstract
ABSTRACT Essential oils from four scented geranium [all cultivars of Pelargonium quercifolium (L.F.) L'Herite.] were distilled annually and analyzed by GC/MS over a period of three years. The cultivars studied were: ‘Giant Oak,’ ‘Staghorn Oak,’ ‘Sharptooth Oak’ and ‘Skeletons Unique.’ More than 120 components were detected in each oil with partial or complete identifications made on 57 to 72 constituents per oil. Considerable quantitative variation in composition occurred in the oils over the three-year period. The major components in the oil of ‘Giant Oak,’ ‘Sharptooth Oak’ and ‘Staghorn Oak’ were α-phellandrene (12.8–24.9%) and p-cymene (18.7–22.5%). The oils of ‘Sharptooth Oak’ and ‘Staghorn Oak’ differed from the ‘Giant Oak’ by also containing substantial amounts of hexyl butyrate (4.5–10.7%) and trans-2-hexenyl butyrate (16.0–19.4%). The major components in the cultivar ‘Skeletons Unique’ were: α-guaiene (15.7%) and geranyl butyrate (19.4%).
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