Streptocarpus denticulatus is a monocarpic, unifoliate species closely related to the red-flowered Streptocarpus dunni. It has almost smooth (glabrous) heavily ribbed leaves (170 x 50 mm maximally) with distinct serrations on the leaf margins. The leaves contain dark red granules full of the red dunnione pigment responsible for the colour of the red flowers in Strepocarpus dunni, but it does not have a truly red flower. Its short, tube shaped flowers (20 mm) are pale violet to pinkish red with the base of the lower lip whitish, floor of the tube greenish with crimson spots and streaks inside the corolla tube extending into the lower lip.
S. denticulatus occurs in higher elevation grassveld in rock cracks where it is protected from sunlight and from winter fires. It occurs from Barberton to the area around Belfast some 120 km away in the Mpumalanga Province of South Africa.
The species has been in cultivation, and is often grown mounted to a piece of tree fern with some additional growing media. This seems to adequately reflect its natural habitat, well-drained rocky areas and crevices, but does require frequent watering.
