Van der Walt, S.J.; Steyn, D.G.; Du Toit, P.J.
(Pretoria : The Government Printer, 1940)
The toxicity of 22 plants was investigated. According to the available literature the following five of these plants were proved for the first time to be toxic: Cryptolepis decidua N.E.Br., Cryptostemma calendulaceum R.Br., ...