Nemesia rupicola, the mountain nemesia, is a branched perennial of north-eastern South Africa, growing in inland grassland, as well as in Lesotho and Swaziland. It occurs widespread, often on rocky slopes, including Drakensberg cliffs.
The plants grow to 70 cm. The leaves are ovate with toothed margins and conspicuous indentations on the upper leaf surfaces along the main veins. The flowers grow in short racemes at stem tips. Flower colour may be white, pink and pale mauve. There is a short spur at the back of the corolla. The two characteristic, elliptic, cushion-like humps can be seen in the photo at the base of the lower lip.
This plant was observed in the Mkhomazi Wilderness Area during January. It has a pale lower lip and vertical dark lines along the surface of the upper lip (Manning, 2009; iSpot).