The leaves of Hermannia joubertiana are wedge-shaped to inversely lance-shaped, i.e. oblanceolate. Fine toothing can be observed on the margins of the narrow leaves in picture; some lower leaves may be pronouncedly three-toothed. The leaves, red upper stems and flower calyces are all notably hairy. The leaves appear slightly fleshy, their surfaces shiny. Longitudinal infolding occurs along the leaf midrib that may curve down towards the tip. Leaf tips are sometimes red, also the upper margins. Leaf stipules, nearly half as long as the leaves, are present at the petiole base (Privett and Lutzeyer, 2010; JSTOR).