References
- Cain , S. A. 1944 . Foundations of Plant Geography. New York
- Good , R. 1953 . The Geography of the Flowering Plants., , 2nd ed. London
- Levyns , M. R. 1949 . ‘The floral morphology of some South African members of Polygalaceae.’ . Journ. S. Af. Bot. , 15 : 79 – 92 .
- Levyns , M. R. 1950 . ‘The relations of the Cape and Karroo floras near Ladismith, Cape.’ . Trans. Roy. Soc. S. Afr. , 32 : 235 – 46 .
- Levyns , M. R. 1952 . ‘Clues to the past in the Cape Flora of to-day.’ . S. Af. Journ. Sc. , 49 : 155 – 64 .
- Levyns , M. R. 1954 . ‘The genus Muraltia.’ . Journ. S. Af. Bot., Suppl. , 2.
- Weimarck , H. 1941 . ‘Phytographic groups, centres and intervals within the Cape Flora.’ . Lund. Univ. Arsksr. , 37.