In this study, we examined the composition regarding secondary metabolites of P. mugo Turra ssp. mugo growing in the protected area of Majella National Park, which is the southernmost station of the habitat of this species. Both the nonpolar and polar fractions were considered. In particular, the essential-oil composition showed a high variety of compounds, and 109 compounds were detected, and 101 were identified, among which abietane-type compounds have a taxonomic relevance. Abietanes were also isolated from the polar fraction, together with an acylated flavonol and a remarkably high amount of shikimic acid.

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Abstract

The leaves of Tecoma chrysantha Jacq. a tree of the tropics, contain together with 6-epiaucubin ( 1), a less polar iridoid 2. Chemical and spectroscopical data demonstrated that 2 contains a residue of 1 esterified by 8-hydroxy-2,6-dimethyl-2,6-octadienoic acid ( 3), a rare monoterpenic product.

From the aerial part of Verbascum sinuatum L. a new iridoid diglycoside III has been isolated and its structure elucidated as 6-0-alphaL-rhamnopyranosylaucubin.