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Surface compounds were obtained by a methylene chloride extraction of fresh ower heads of Flourensia thurifera. The methylene chloride extract was puried by column chromatography and analyzed by GC-MS, leading to the identication of several monoterpenes, sesquiterpenes and diterpenes. A hydrocarbon fraction of n-alkanes from C23 to C31 and C33 was also identied. Headspace analysis of the fresh ower heads was also carried out. Different proportions of the same mono- and some of the sesquiterpenes were identied in the volatile fraction. The presence of mono- and sesquiterpenes in the ower heads is in agreement with the fact that these families of compounds have been identied in other Flourensia species. keywords: Flourensia thurifera.; Asteraceae; Flower heads; Methylene chloride extract; Headspace; GC-MS; Monoterpenes; Sesquiterpenes; Diterpenes; HydrocarbonsINTRODUCTIONFlourensia thurifera (Mol.) D.C. (Asteraceae, Heliantheae) is a shrub with attractive yellow owers from 8 to 10 cm in diameter. The plant is found in semi-arid land in Central Chile from Los Vilos (32°S latitude) to beyond the latitude of Concepcion (37°S). It sometimes forms large and almost monospecic communities covering north facing slopes of hills

ANALYSIS OF SURFACE AND VOLATILE COMPOUNDS OF FLOWER HEADS OF FLOURENSIA THURIFERA (MOL) D.C.