A bies alba, O leoresin, TerpenesTerpene com position o f needle and cortical oleoresin from lateral shoots were analyzed by GC/MS for four Silver fir (A bies alba Mill.) populations scattered in natural species range in Albania. More than sixty compounds were detected in the needle oleoresin, which was characterized by a high content of a-pinene, camphene, ß-pinene, limonene and bornyl ace tate. Three m onoterpenes, a-pinene, ß-pinene and limonene, and two sesquiterpenes, ß-caryophyllene and germacrene D, comprised the majority of cortical oleoresin. The terpene composition differences among the populations that led to the recognition o f two chemotypes. The needle oleoresin from the provinces of Puka, Bulqiza and Llogara were character ised by high amounts of ß-pinene, camphene and a-pinene and low amounts of limonene, while that from D renova had high amounts of ß-pinene and limonene. A similar pattern was found in the cortical oleoresin with the exception of camphene that was a minor contributor. Geographical and seasonal variation between the populations was, also, investigated. Multi variate analysis o f both needle and cortical oleoresin separated D renova (southeastern pop ulation) from the other sites. W hen both major m onoterpenes and sesquiterpenes were con sidered four chemical profiles could be attributed. Based on their chemical profiles, the populations can be divided into two groups:• Populations with high content of ß-pinene and a-pinene but a low content of limonene (Puka, Bulqiza and Llogara), typical of most of A. alba populations in all its distribution range.• Population with a high content of limonene and a moderate content of ß-pinene and apinene (D renova).
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