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Summary. The xanthone isogentisin and two flavonic hetcrosidcs (isoorientin-4'-O-glucoside and isovitexin-4'-0-glucoside) have been isolated from lcavcs of Gentzana lutea L. by means of column chromatography on polyamidc. The determination of the structures and the NMR. spectra of the acetylated derivatives are reported.

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Six polyphenolheterosides have been isolated from the leaves of G. lutea L. by means of thin layer and column chromatography on polyamide. The xanthones mangiferin (III) and gentioside (IV), the flavones isoorientin (V) isovitexin (VI) and two new heterosides (E and F) have been isolated. E gave isoorientin and glucose on hydrolysis and F isovitexin, glucose and gentiobiose. Structure identification has been achieved by UV., IR. and NMR. spectroscopy as well as by synthesis of the corresponding aglycones.

L‐(+)‐bornesitol has been isolated from the leaves of G. lutea L. in the proportion of 1,6% by weight of dried material. Meso‐inositol has also been detected by chromatography. Distribution of L‐(+)‐bornesitol and its taxonomic interest are discussed.