The small yellow flowers of Hermannia desertorum are pendulous, growing from leaf axils near stem tips. Each has a thick, pinkish and hairy calyx at the base, which in their case is at the top.

The corolla is curiously spiral-shaped; delicately thin petals overlap each other with one edge free, the other inside the narrow tube around the five stamens and the greenish style (Shearing and Van Heerden, 2008).