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The chemical composition of the volatile oils of seeds of Foeniculum vulgare Miller from two Spanish locations (Santander and Aranjuez) were investigated by means ofGCandGC/MS. LeafandstemoilsofF. vtdgmfmmAmnjuewwerealsoexamined. Two different chemotypes have been found in the seeds: (I) methyl chavicol (54.9%), fenchone (24.6%) in the seeds collected in Santander; and (XI) (E)-anethole (54.9-38.1%), fenchone (22.2-34.4%) in the seeds gathered in Aranjuez. The oil from the leaves collected in Aranjuez (April, June) was found to contain methyl chavicol (1 2.3-1 2.1%), a-phellandrene (9.4-27.2%), limonene (25.3-18%) and fenchone (19.4-18.3%) as major constituents. The oil from the stems gathered in Aranjuez (September) was characterized by a high content of (E)-anethole (17.4-3.3%), a-pinene (9.7-14.4%), a-phellandrene (24.3-31.4%), p-cymene (1 1.5-5.2%), limonene (11.6-15%) and fenchone (9.1-17.5%).

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