Genera and species of the grass subtribe Sorghinae were investigated. This study covered taxa from the whole range of their morphological variation and geographic distribution. In order to make the study feasible in the time permitted, a representative sample was chosen. Parameters used in choosing this sample are outlined in Chapter 1. The objective of the study was to determine and ascertain generic boundaries in the subtribe and hence reveal relationships between them. Fourteen genera are recognised in the subtribe. These are Asthenochloa, Bothriochloa, Capillipedium, Chrysopogon, Cleistachne, Dichanthium, Euclasta, Hemisorghum, Pseudodichanthium, Pseudosorghum, Sorgahstrum, Sorghum, Spathia and Vetiveria. They were confirmed to form clearly distinct genera despite suggestions by some authors to the contrary, some of whom have advocated merging some genera in the subtribe. The genera divide into two groups. The first group consists of Sorghum and allies, while the second group is centred around Dichanthium (Chapter 3). Numeric analyses were used to highlight both phenetic and phylogenetic relationships between the genera (Chapter 7). The phenetic analysis broadly revealed a somewhat similar picture to the one I held. Species of the same genus cluster in the same place. Also those genera that are least similar separate at low phenon levels. The cladogram produced, however, was totally different from my intuitive classification of the subtribe. Formal taxonomic descriptions incorporating keys and specimens seen can be found in Chapter 8. A new combination in Euclasta, E. oligantha (Hotchst. ex. Steud). M.P. Setshogo, was recognised (Appendix 11.2). Several sources of evidence were used in the research. These were the use of micro- and macro- morphology and anatomy. The research was based on the use of herbarium material as well as living plants.