Pieris napi - Green-veined White. 35 - 45mm. An extremely variable species generally distributed in the Palaearctic and ranging to North America. A great number of geographical races inhabiting this region have been described, and the species also shows marked seasonal polyphenism: in particular, the spring generation is most strongly patterned ('a' adult of first generation - underside of wings, belongs to second generation). The Green-veined White has one to three generations a year merging into each other: thus the butterfly appears on the wing practically from spring till autumn. The caterpillar lives on wild crucifers (only rarely attacking crops); the chrysalis hibernates.
Text from: A field Guide in Colour to Butterflies and Moths (1982) Ivo Novak. Octopus
