This narrow-leaved and white-flowering Hermannia cernua shrublet was photographed in the Karoo National Park near Beaufort West during May. It looked healthy, flourishing in a rock crevice.
There is a similar plant growing on the Karoo plains that has blue flowers, called H. cernua subsp. jacobeifolia. That subspecies grows a few stems to 25 cm tall, not very different from the one seen here.
The leaves of the plant shown here are green to blue-green, the midrib recessed and the margins irregularly toothed (Shearing and Van Heerden, 2008; Manning and Goldblatt, 1997).