The Eastern Sorrel Copper (Lycaena clarki) is a butterfly of the Lycaenidae family. It is found only in South Africa. The wingspan is 21–27 mm in males and 22–30 mm in females. The butterfly flies year-round, peaking in summer. Larval food is Rumex lanceolatus. The larvae vary considerably in colour, ranging from plain green to pinkish red. However, there is always a white subspiracular stripe and a dorsal line of a darker colour. Both eggs and pupa may hibernate.