Phyllonorycter rhynchosiae is a moth of the family Gracillariidae. It is known from South Africa.[1] The habitat consists of the urban hills of Pretoria.
The length of the forewings is 3–3.3 mm. Adults are on wing from early January to mid-March and from early June to mid-August.[2]
The larvae feed on Eriosema psoraleoides, Rhynchosia confusa and Rhynchosia nitens. They mine the leaves of their host plant.