Capparis ovata var palaestina Zoh, C spinosa var aegyptia Bolss and C spinosa var deserti Zoh, were investigated for glucosinolates. Glucoiberin, glucocapparin, sinigrin, glucocleomin, glucocapangulin, glucobrassicin and neoglucobrassicin, in addition to two others, were isolated. Four of these viz glucolberm, sinigrin, glucobrassicin and neoglucobrassicin were detected for the first time in Capparis species. Comparative chromatographic analyses of the glucosinolates of the plants examined revealed qualitative differences