In this thesis, the results of morphological and phylogenetic studies on the genus Gloriosa L. (family Colchicaceae) are presented. Also included is an extensive review of ethnobotanical, horticultural and commercial uses of G. superba L., a commercial source of colchicine. Colchicine is an important pharmaceutical chemical with a wide range of domestic and industrial applications. The overall aim of this study was to revise the genus Gloriosa over its  distributional range and to evaluate its classification and phylogeny. Documentation of the economic uses of G. superba, a valuable medicinal plant in South Africa, tropical Africa and Asia was also perceived to be essential in understanding the biology of the species. Colchicaceae and Gloriosa will be introduced briefly, as well as the research questions and research methodology. This introduction is concluded with an outline of the thesis.