Aspalathus kougaensis bears solitary yellow flowers near stem-tips, embedded among the numerous needle-like leaves and not much protruding beyond them. Young branchlets may be hairy, even woolly.

The flower-shape resembles that of the peaflower, as Aspalathus and Fabaceae flowers generally do. These flowers conceal their styles and the nine stamens, later to push out the lengthened style-tips as their fruit pods develop, visible on the old flower in picture on the far left (Bond and Goldblatt, 1984; JSTOR; iNaturalist).