1. The botanical nomenclature is in accordance with Rehder, A.: manual of Cultivated Trees and Shrubs, 2nd Edition . - New York1947 .
2. Anonymous : - Annual Rep., Forestry Div., Dep. of Agr. and Forestry, Union of South Africa. 1941 . (Cit. from Forestry Abs. 4:15. 1942/43.).