Pearson, H.H.W. & Stephens, E.L. 1912. List of the plants collected in the Percy Sladen Memorial Expeditions, 1908-9, 1910-11: Portulacaceae. Annals of the South African Museum 9:30-35.

Pearson, H.H.W. & Stephens, E.L. 1912. List of the plants collected in the Percy Sladen Memorial Expeditions, 1908-9, 1910-11: Portulacaceae. Annals of the South African Museum 9:30-35.
http://pza.sanbi.org/references/pearson-hhw-stephens-el-1912-list-plants-collected-percy-sladen-memorial-expeditions-1908