Abstract
The genus Canthium subgen. Canthium is discussed and recognized as occurring in tropical Africa; three additional tropical African subgenera are recognized: subgen. Bullockia (Bridson 1987), subgen. Afrocanthium and subgen. Lycioserissa (both Bridson 1991), the latter two being revised here. A key is provided to include the genera previously segregated from Canthium (Bridson 1985, 1986, 1987, 1987a) and the tropical African subgenera of Canthium. One new combination at subspecific rank is made, and one new variety described in subgen. Canthium, 3 new species and 1 new subspecies described in subgen. Afrocanthium, and 1 new subspecies described in subgen. Lycioserissa; one new name is provided for a species unplaced subgenerically. Keys are included for the species of subgen. Afrocanthium and subgen. Lycioserissa. Distributions are given and citations included for new taxa. A complete list of all African epithets in Canthium and Plectronia with their current position is appended (Appendix 2).
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