A phytochemical study of two plant species, Viscum cruciatum Sieber and Crataegus monogyna Jacq., was completed to investigate the influence of the parasite Viscum cruciatum on the host Crataegus monogyna. The study was carried out with two samples and consisted of hexane extracts of the Viscum cruciatum parasitizing on Crataegus monogyna and C monogyna. In these samples ursolic acid, beta-sitosterol and a triterpene fraction were found that contained mainly butyrospermol (3beta-lanost 8, 24-dien, 3-ol), 24-methylene-24-dihydrolanosterol (24-methylene-5alpha-lanost-8-en-3beta-ol), cycloartenol (9beta, 19-cyclo-5alpha, 9beta-lanost-24-en-3beta-ol), beta-amyrin (olean-12-en-3beta-ol) and several aliphatic alcohols identified as the C18 to C30 members of the 1-alkanol homologous series. beta-Amyrin acetate was only isolated from Viscum cruciatum and was not found in Crataegus monogyna.