Albizia is a genus of about 150 species of mostly fast-growing subtropical and tropical trees and shrubs in the Subfamily Mimosoideae of the legume family, Fabaceae. The genus is pantropical, occurring in Asia, Africa, Madagascar, Central, South, and southern North America and Australia, but mostly in the Old World tropics.

Albizia suluensis, also known as Ingwebu-enkulu, Ungwebo-omkulu, or Unyazangoma in isiZulu, Zulu Albizia or Zulu False-thorn in English, and Zulu-valsdoring in Afrikaans, is an endangered species endemic to South Africa. This stunning and graceful tree is endemic to KwaZulu-Natal and is highly valued for its strong, durable timber. While it closely resembles Albizia lebbeck, it can be easily distinguished by its wavy leaflet margins and the golden hairs on its flowers.

Albizia suluensis is a deciduous tree, growing between 5 and 15 meters tall with a rounded or spreading crown. Its bark is grey, with a straight trunk and thick, blunt-tipped branches. The tree blooms in summer (from December to January), with white to pinkish flowers grouped in rounded heads.

This species faces the threat of extinction due to its limited distribution in a densely populated rural region where local communities rely on it for various resources. Outside the Hluhluwe Umfolozi Game Reserve, the tree is often harvested for firewood, building materials, and medicinal purposes, contributing to the decline of its population. Moreover, habitat destruction from farming and the harvesting of its bark for its powerful medicinal properties exacerbate the situation. The natural range of the tree is further compromised by the presence of invasive alien plant species.

Albizia suluensis is found only in KwaZulu-Natal, South Africa, from Hlabisa to Hluhluwe. It thrives in the Forest Biome, typically growing along streams or steep slopes at altitudes ranging from 275 to 1,370 meters. The tree’s flowers attract butterflies.

In Zulu traditional medicine, this plant is used in a variety of ways. A stirred infusion is administered as an enema to induce trances and treat nervous disorders. The bark, when mixed with water, produces an irritant foam that is used as a remedy to reduce fever. The wood is valued for its durability and is used for timber, furniture, firewood, and construction materials.