The present study is a taxonomic revision and a contribution to establish monographs on a medicinally important genus, Cassia L. sensu lato, in the Sudan, so as to help in standardization of botanical drugs and to update the botanical names. A total number of 23 species (16 indigenous and 7 exotic) belonging to this genus were studied, which constitute all the species recorded in the main and regional Sudanese Floras besides the species deposited at various herbaria of the Sudan. A taxonomic review of these species has been made and the Latin names have been updated. The species were studied...