Swanepoel, Wessel, Kyle G. Dexter, Oriane Loiseau, and Abraham E. Van Wyk. 2023. “Reinstatement of the Name Petalidium ovatum (Acanthaceae), With an Amplified Description of the Species”. Phytotaxa 626 (3). Auckland, New Zealand:159-69. https://doi.org/10.11646/phytotaxa.626.3.2.