The aim of the present series of investigations is a systematic study of the glycoside compositions of various organs of Hedera canariensis Willd. (synonyms Hedera helix canariensis DC., H. algeriensis Hibberd, H. maderensis C. Koch, H. grandifolia Hibberd, H. azorica Carr., and H. canariensis var. azorica Bean), fam. Araliaceae. Algerian ivy is distributed in the Azores, the Canary islands, the islands of Madeira, and parts of the West African littoral (Algeria, Morocco) and is widely cultivated as a decorative plant in many countries [1]. However, its glycoside composition has not been studied previously.In the present paper we describe the isolation and identification of 13 triterpene glycosides from the leaves of Algerian ivy. TLC analysis of an alcoholic extract of the leaves showed the presence of nine groups of glycosides, L-A-L-I in order of increasing polarity. To isolate the glycosides, the dried and comminuted plant raw material was defatted and was then extracted with aqueous isopropanol. The preparative chromatographic separation of the extract into the glycoside fractions L-A-L-I was carried out on silica gel (SiO2) with gradient elution by water-saturated mixtures of chloroform and ethanol. According to the results of TLC analysis, fractions L-A, L-C, and L-D consisted of individual glycosides, while the other fractions each contained several glycosides, the preparative separation of which was achieved on Silpearl microspherical silica gel with elution by water-saturated mixtures of chloroform and ethanol. The glycosides were additionally purified by the elimination of phenolic impurities on SiO 2 with elution by mixtures of chloroform and ethanol saturated with aqueous anu-nonia.The complete acid hydrolysis of glycosides L-A (1), L-B 1 (2) and L-B 2 (3) showed the presence in them of one and the same monosaccharide --arabinose --and, respectively, the aglycons oleanolic acid (14), echinocystic acid (15), and hederagenin (16). The treatment of these glycosides with an ethereal solution of diazomethane converted them into methyl esters, while alkaline hydrolysis caused no changes whatever. Consequently, in (1-3) the arabinose residue was attached at a) Simferopol' State University, fax (0652) 23 23 10. b) Botanical