Aspalathus setacea bears solitary, smallish yellow flowers near stem-tips of short branches, embedded among the numerous needle-like leaves flanking the flowers. The young branchlets are hairy.
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 (Euston-Brown and Kruger, 2023; Bond and Goldblatt, 1984; iNaturalist; https://www.worldfloraonline.org).