Methanol extracts obtained from leaves of two Rosaceae species were studied for their free radical scavenging activity and the composition of polyphenols. Both Potentilla alba and Waldsteinia geoides were cultivated in a botanical garden and can be grown easily in order to supply crude drugs. The leaves of P. alba were considerably more abundant in total contents of polyphenols, particularly in oligomeric procyanidins. While both species show antioxidant properties, in the case of P. alba the activity was significantly higher, which can be attributed to a high concentration of procyanidins and other phe- nolics. Both species are interesting as potential sources of efficient antioxidants and should be further explored in order to use them as herbal supplements in preventing the oxidative stress-related diseases.