Oberlander, K. C., Roets, F. and Dreyer, L. L. (2014) “Discovery of substantial Oxalis (Oxalidaceae) diversity and endemism in an arid biodiversity hotspot”, Phytotaxa. Auckland, New Zealand, 181(2), pp. 79–95. doi: 10.11646/phytotaxa.181.2.2.