Plants of this species are found from the Richtersveld to the Vanrhynsdorp area; they grow in crevices and small pans on rocky outcrops or steps of granite, sandstone or quartz. These specialised habitats retain more moisture than their surroundings: rather important in an area with usually less than 100 mm rain per year.
They form low shrublets with a central head and trailing branches which do not root at the nodes.
The leaves are three-sided, often laterally compressed, brown to dark green.
In June-July the flowers appear with 3-5 together (rarely solitary); they are up to 3.5 cm in diameter with white, purple or bicoloured petals and filamentous staminodes gathered in a central cone.
The fruits have 7-12 (usually 10) compartments, with the top higher than the basal part.