Pieris bryoniae, the dark-veined white, is a European butterfly of the family Pieridae. It is much sought after by collectors, particularly in Austria. This is because one of the most variable populations of this butterfly lives in the well-known Mödling area near Vienna. There has been a long debate among experts as to whether it is an independent species or only a subspecies of the "green-veined white", Pieris napi.