LITERATURE CITED
- Bentham , G. and Hooker , J. D. 1842 . “Genera plantarum.” London
- Saxton , W. T. 1907 . “On the Development of the Ovule and Embryo-sac in Cassia tomentosa Lamk.” . Trans. S. A. Phil. Soc. , 18 : 1 – 5 . pls. 1, 2
- Schönland , S. 1907 . “A Study of some Facts and Theories bearing upon the Question of the Origin of the Angiospermous Flora of South Africa.” . Trans. S. A. Phil. Soc. , 18 : 321 – 367 .