Phyllonorycter rhynchosiae is a moth of the family Gracillariidae. It is known from South Africa. The habitat consists of the urban hills of Pretoria.
The length of the forewings is 3âÂÂ3.3 mm. Adults are on wing from early January to mid-March and from early June to mid-August.
The larvae feed on Eriosema psoraleoides, Rhynchosia confusa and Rhynchosia nitens. They mine the leaves of their host plant.