(IMAGE) Helmholtz Centre for Environmental Research - UFZ Caption The field scabious (Knautia arvensis) shows pronounced genetic differences between northern and southern Germany and in addition regional adaptation. Credit Photo: Walter Durka Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.