Vachellia robusta subsp. clavigera (E.Mey.) Kyal. & Boatwr. – native to Malawi, Mozambique, Zambia, Zimbabwe, Botswana, Namibia, Eswatini, and South Africa.[4]
Vachellia robusta subsp. robusta – native to South Africa, Botswana, and western Zimbabwe.[5]
Vachellia robusta subsp. usambarensis (Taub.) Kyal. & Boatwr. – native to Ethiopia, Somalia, Kenya, Tanzania, and Mozambique.[6] It is a common canopy tree in drier undifferentiated forest communities in the Northern and Southern Zanzibar-Inhambane coastal forest mosaic of coastal Somalia, Kenya, Tanzania, and Mozambique, where it grows up to 20 meters high.[7]
^White, Frank F. (1983). The vegetation of Africa: A descriptive memoir to accompany the Unesco/AETFAT/UNSO vegetation map of Africa. UNESCO, 1983. ISBN 92-3-101955-4