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A rare bis-rhamnopyranoside of aromadendrin, besides isoflavones of chemosystematic importance and peculiar compounds never reported in the genus, was identified from the flowers of Genista cilentina, an Italian endemic species. The structure of the aromadendrin derivative was elucidated by means of 1D and 2D NMR techniques. The exclusivity of the observed molecular pattern in comparison with other Genista species was further discussed from a chemotaxonomic point of view. A huge quantity of flavonoids in aglycone form resulted selectively accumulated in flowers. Keywords: Genista cilentina Vals., Aromadendrin bis-rhamnopyranoside, Isoflavonoids, Chemotaxonomy