Onosma is a genus of hairy plants distributed around the East Mediterranean Sea and in Central Asia.9 In continuation of our study of greek Onosma species (Boraginaceae) for their alkaloidal content,9 we report herein the results of the chromatographic separation of the MeOH extract components of the aerial parts of Onosma erecta Sibth. & Sm. (Boraginaceae), collected from southern Greece. O. erecta is a perennial herb with a lignified base and a cushion-like growth habit, lanceolate leaves, and yellow flowers, growing in dry rocky locations, either within low vegetation or in sparse conifer forests.