Vachellia is a genus of flowering plants in the legume family, Fabaceae, commonly known as thorn trees or acacias. It belongs to the subfamily Mimosoideae. Its species were considered members of genus Acacia until 2009. Vachellia can be distinguished from other acacias by its capitate inflorescences and spinescent stipules. Before discovery of the New World, Europeans in the Mediterranean region were familiar with several species of Vachellia, which they knew as sources of medicine, and had names for them that they inherited from the Greeks and Romans. The wide-ranging genus occurs in a variety of open, tropical to subtropical habitats, and is locally dominant. In parts of Africa, Vachellia species are shaped progressively by grazing animals of increasing size and height, such as gazelle, gerenuk and giraffe. The genus in Africa has thus developed thorns in defence against such herbivory. The members of Vachellia are trees or shrubs, sometimes climbing, and are always armed. Of the 163 species currently assigned to Vachellia, 52 are native to the Americas, 83 to Africa, Madagascar and the Mascarene Islands, 32 to Asia and 9 to Australia and the Pacific Islands.

Vachellia robusta, previously known as Acacia robusta and commonly known as Splendid Acacia, Splendid Thorn or Robust Acacia, forms a medium to large tree, up to 25m in height. It is a deciduous thorn tree and has a very robust looking form. The branches grow upright resulting in a beautiful flat crown. It has small, dark green leaves and pale yellow puff ball flowers. The flowers form along the branches in a spectacular display and they emit a sweet distinctive Acacia scent during early spring. During summer it forms attractive sickle-shaped seed pods. It has brown to black bark which is very rough with longitudinal grooves in it. Splendid Acacia is a rather widespread tree in the Northern Gauteng area as it prefers a warmer climate, but is fairly hardy once established. It is a rapid grower.