1. The Families of the Monocotlydons;Dahlgren,1985
2. Plants of Southern Africa: Names and Distribution;Reid,1993
3. A List of the Flowering Plants of Botswana In the Herbaria at the National Museum, Sebele and University of Botswana;Turton,1994
4. The Medicinal and Poisonous Plants of Southern and Eastern Africa;Watt,1962
5. Chemotaxonomic significance of anthraquinones in the roots of asphodeloideae (asphodelaceae)