Rogeria longiflora, the desert foxglove or in Afrikaans djirrie witblom (djirrie white flower), is an erect shrub that grows to 2 m in dry, sandy river courses of the north-eastern Richtersveld. The plant also grows in the Namib Desert on the northern side of the Gariep River and has been used medicinally by indigenous people.
The branched stems are yellow-green, woody, somewhat square in cross-section and sticky to the touch. The leaves are opposite, broadly ovate and dark green with shiny surfaces. Conspicuous veins spread from the leaf base and branch further up. Leaves are large, up to 20 cm long and wavy, sometimes recurving at the tips. They grow on long petioles.
In wet years these plants multiply in sandy flats. This plant was found in habitat in the eastern Richtersveld (Williamson, 2010; iSpot; www.namibrand.com; www.kyffhauser.co.za; www.sciencedirect.com).