Title: Senegalia nigrescens
Content:  Senegalia nigrescens, the knobthorn, is a deciduous African tree, growing up to 18 m tall, that is found in savanna regions from West Africa to South Africa. The tree is resistant to drought, not resistant to frost and its hard wood is resistant to termites. Giraffes often browse on the flowers and foliage of this tree, while the seed pods and foliage are browsed on by a range of mammals, including elephants.
Title: Timber trees of Gauteng
Content:  Rich. ; Tarchonanthus camphoratus L. ; Tecoma stans (L.) Juss. ex Kunth ; Tipuana tipu (Benth.) Kuntze ; Toona ciliata M.Roem. (Cedrela toona Roxb. ex Rottler) ; Trichilia emetica Vahl ; Ulmus parvifolia Jacq. ; Ulmus minor Mill. ; Vepris lanceolata (Lam.) G. Don ; Virgilia divaricata Adamson ; Zanthoxylum capense (Thunb.) Harv. ; Ziziphus mucronata Willd. This is an alphabetical list of useful timber trees, indigenous (cultivated and natural) and exotic, growing in the Gauteng area of South Africa. These trees range in size up to some 1.5m DBH, such as Cedrus deodara, the Himalayan Cedar. Hobbyists will seek out even small pieces of highly valued timber, 
Title: Wildlife of Botswana
Content:  called nchwachwa during the dry winter season. The species Kigelia africana of sausage tree grows in the Okavango Delta, especially in the Xakanaxa, Third Bridge and Mboma Island areas, and can reach heights of up to 20 m, making it amongst the tallest trees in Botswana. It is noted for its fruits which resemble oversized sausages and can weigh up to 4–5 kg and up to 50 cm long and 15 cm in diameter. The bark is grey and smooth in younger trees and may exhibit leaves up to 30 cm long and dark red to maroon cup-shaped flowers measuring 15 by 15 cm, which bloom in August to October.
Title: Fauna of South Africa
Content:  dominated by shrubs in ecological communities known as thicket and noorsveld, where succulent species such as Euphorbia, Aloe, and Portulacaria afra are common, as well as Cape honeysuckle Tecoma capensis and Cape leadwort Plumbago auriculata. To the west, the vegetation intergrades into Mediterranean shrubland known locally as fynbos, dominated mainly by plant families rare in other habitats, such as Proteaceae, Ericaceae and Restionaceae. Here the vegetation is made up of sclerophyllous plants which do not support much mammal or bird life. Finally, the last biome found is forest, which only covers 1% of South Africa and is concentrated around the Knysna area and scattered along the escarpment of the Drakensberg mountains upwards along Kwa-Zulu Natal.
Title: Vachellia erioloba
Content:  Plants of the genus Alhagi are also sometimes called camelthorns or camel thorns Vachellia erioloba, the camel thorn, giraffe thorn, or Kameeldoring in Afrikaans, still more commonly known as Acacia erioloba, is a tree of southern Africa in the family Fabaceae. Its preferred habitat is the deep dry sandy soils in parts of South Africa, Botswana, the western areas of Zimbabwe and Namibia. It is also native to Angola, south-west Mozambique, Zambia and Swaziland. The tree was first described by Ernst Heinrich Friedrich Meyer and Johann Franz Drège in 1836. The camel thorn is a protected tree in South Africa. The tree can grow up to 20 metres high. It is slow-growing, very hardy to drought and fairly frost-resistant. The light-grey colored thorns reflect sunlight, and the bipinnate leaves close 
Title: Combretum apiculatum
Content:  It occurs in South Africa, Swaziland, Botswana, Mozambique, Namibia, Zimbabwe, southern Angola, Zambia, Malawi, southeastern DRC, Tanzania and southern Kenya. This tree occurs in various ecosystems in southern Africa. It is the dominant tree on the savanna in many areas, including regions characterized as lowveld and mopane savanna. It grows alongside other woody vegetation such as common hook thorn (Acacia caffra), sicklebush (Dichrostachys cinerea), large sourplum (Ximenia caffra), livelong (Lannea discolor), white seringa (Kirkia acuminata), and marula (Sclerocarya caffra).
Title: Senegalia montis-salinarum
Content:  Senegalia montis-salinarum, is a species of thorn tree that is native to two separate localities in the Soutpansberg range in Limpopo, South Africa. The total population is estimated at no more than 250 adult trees. Based on its morphology, it is assigned to the S. burkei species complex.
Title: Mopane
Content:   Colophospermum mopane, commonly called mopane, mopani, balsam tree, butterfly tree, or turpentine tree, is a tree in the legume family (Fabaceae), that grows in hot, dry, low-lying areas, 200 to 1150 m in elevation, in the far northern parts of southern Africa. The tree only occurs in Africa and is the only species in genus Colophospermum. Its distinctive butterfly-shaped (bifoliate) leaf and thin seed pod make it easy to identify. In terms of human use it is, together with camel thorn and leadwood, one of the three regionally important firewood trees.
Title: Boscia albitrunca
Content:  Boscia albitrunca, commonly known as the shepherd tree or shepherd's tree (Witgat, Mohlôpi, Motlôpi, Muvhombwe, Umgqomogqomo, Umvithi), is a protected tree in South Africa. The species epithet "albitrunca" refers to the oftentimes white trunk. Traditionally, the shepherd tree was used by Dutch settlers, "boers", to create a variant of coffee that is derived from the roots of the tree. It is an evergreen tree native to southern and tropical Africa, living in the hot, dry, and often brackish low-lying areas, sometimes on abundant lime or occasionally found in rocky terrain. It is a common tree of the Kalahari, bushveld and lowveld. It is one of the most important forage trees in the Kalahari.
Title: Paulownia tomentosa
Content: South Africa 

Question: south african tree with thorns on the trunk?
Answer: silk floss tree.