green veined white butterfly (IMAGE) Helmholtz Centre for Environmental Research - UFZ Caption The green veined white butterfly (Pieris napi) is a butterfly and belongs to the white butterfly family (Pieridae). It is common throughout Europe and as the species flies in three to four overlapping generations per year, it can be seen from March to October. Credit ©Ulrike Schäfer Usage Restrictions Copyright must be indicated License Original 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.