The leaves of Rothmannia capensis are simple, usually growing opposite while occasionally having a third leaf with the pair, forming a small whorl. The leaves are crowded near stem tips, growing on short leaf stalks (petioles). The stalks become up to 5 mm long, but are sometimes very short, almost absent. Ovate stipules grow at the petiole base.
The leaves are elliptic in shape, their tips tapering, sometimes slightly rounded or attenuating and the leaf bases tapering. Leaf margins are entire. Leaf size may reach 10 cm by 4 cm (Coates Palgrave, 2002).