Unlike most members of the Gesneriaceae, R. nathaliae usually has only four lobes to the corolla, rather than the usual five. It grows naturally in rocky crevices in Serbia and Macedonia, and is a fine rock garden (in appropriate climates) or alpine house subject. In this photo it is growing in the alpine house at Wisley Gardens in the UK. A closeup of the flowers can be seen here and a plant of the similar R. myconi here.