Acacia

Where it grows

The umbrella thorn ranges across dry savannas, semi-deserts, and Sahel woodlands from Senegal east to Sudan and south to South Africa, with extensions into the Arabian Peninsula and the Negev. It is the archetypal “African savanna tree” — the umbrella silhouette under which giraffes browse in countless wildlife photographs.

How to recognise it

The flat-topped, umbrella-shaped crown is the diagnostic field mark on the savanna horizon. Branches carry pairs of formidable straight white thorns up to 8 centimetres long alongside short hooked thorns. The feathery bipinnate leaves are tiny, drought-shed, and fix nitrogen in the soil. Globular yellow-cream flowers cluster densely and release a sweet scent.

Uses

Many African acacias yield gum arabic, the water-soluble exudate that emulsifies soft drinks, watercolours, and pharmaceuticals worldwide. The dense, hard wood makes excellent charcoal, and the seed pods sustain goats and giraffes through the dry season. Acacia honey from related species is prized internationally.

Note on naming

The Acacia genus was reclassified in 2005: African and American species moved to Vachellia and Senegalia, while the Australian wattles kept the name Acacia — a taxonomic controversy that still reverberates in field guides.