Van der Walt, S.J.; Steyn, D.G.; Du Toit, P.J.
(Pretoria : The Government Printer, 1943)
Of the twenty-two plants investigated, six were, for the first time, proved to be toxic, namely Boscia foetida Schinz., Cadaba juncea (Linn.) B. & H.,
Othonna cluytifolia O.K., Drimia alta R. A. Dyer, Scilla natalensis ...