so Balkan endemit and chiefly characteristic for south-east Europe: S. sylvaticus L

Twenty-seven pyrrolizidine alkaloids were identified by a detailed phytochemical study and GC/MS analysis on twelve Bulgarian species from genus Senecio. Twenty of them are new for the corresponding species. Other six structures reimain tentatively identified. Key words: Genus Senecio, Pyrrolizidine Alkaloids, GC/MC Analysis The capillary gas chromatography with mass spectrometry (GC/MS) is convenient and very often used method for analysis of a complex mixture containing pyrrolizidine alkaloids (PAs) As a part of our systematic investigations on the species from the genus Senecio widespread in Bulgaria we studied the alkaloid profile of the well studied specis