Glauca

glauca grow small, 1-nerved, elliptic to lanceolate leaves (only 2-4 by 0.5-2 cm) when growing on ant-plants, in the wild. However when grown under greenhouse conditions, the leaves are longer, broader, ovate and have 3 nerves. This is an example of the large phenotypic variation of leaves in the Pachycentria genus.