Dreyer, L.L., Roets, F. and Oberlander, K.C. 2013. Two new Oxalis (Oxalidaceae) species from the Richtersveld National Park, South Africa. Phytotaxa. 89, 2 (Mar. 2013), 53–63. DOI:https://doi.org/10.11646/phytotaxa.89.2.2.