Ammocharis Coranica, 'Ground lily'.
Agapanthus. If you were wondering where all that Agapanthus came from, it's from Southern Africa.
Earlier this century it was decided to split the old genus of Acacia into several natural groups. The majority of species in the genus are found in Australia, and so it was decided most of these retained the genus name of Acacia.
These Acacias tend to have flowers in balls (capitate inflorescences), and spines on the stems.
Vachellia (Acacia) sieberiana, the 'Paperbark Thorn'
These Acacias tend to have flowers in spikes (spicate inflorescences), and lack spines on the stems.
There are half a dozen species of Euphorbia known as 'Candelabra' that grow as trees in open habitats of Africa. They are also called 'Cactus Tree'; with their thick spiny leaves, they superficially resemble cactus, although they are unrelated.
Maerua is a genus of some 70 species. They are shrubs or small trees. They have showy white or yellow flowers with long stamens. Most species are found in Africa, with some species also in tropical Asia.
Sterculia appendiculata. Found in tropical woodlands and riverine forest in eastern Africa.