(L.) Delile, 1812
There are many common names for this plant. In English the fruit has been called desert date, soap berry tree or bush, Thron tree, Egyptian myrobalan, Egyptian balsam or Zachum oil tree; in Arabic it is known as lalob, hidjihi, inteishit, and heglig (hijlij). In Hausa it is called aduwa, in Swahili mchunju and in Amharic bedena.
Balanites aegyptiaca is found in the Sahel-Savannah region across Africa. It can be found in many kinds of habitat, tolerating a wide variety of soil types, from sand to heavy clay, and climatic moisture levels, from arid to subhumid. It is relatively tolerant of flooding, livestock activity, and wildfire.
The Balanites aegyptiaca tree reaches 10 m (33 ft) in height with a generally narrow form. The branches have long, straight green spines arranged in spirals. The dark green compound leaves grow out of the base of the spines and are made up of two leaflets which are variable in size and shape. The fluted trunk has grayish-brown, ragged bark with yellow-green patches where it is shed.
The inflorescence consists of bunches of a few flowers which are either sessile or are borne on short stalks. The flower buds are ovoid and covered in a short tomentose pubescence. The individual flowers are greenish-yellow in colour, hermaphroditic with five petals in radial symmetry and are 8–14 millimetres (0.31–0.55 in) in diameter. The pedicel of the inflorescence is greyish in colour, downy and usually less than 10 mm (0.39 in) in length, although 15 mm (0.59 in) has been recorded in Zambia and Zimbabwe. The ellipsoid fruit is normally less than 4 cm (1.6 in) long and is green when not ripe; it ripens to a brown or pale brown fruit with a crispy skin enclosing a sticky brown or brown-green pulp around a hard stone.
Balanites aegyptiaca has been cultivated in Egypt for more than 4000 years, and stones placed in the tombs as votive offerings have been found as far back as the Twelfth Dynasty. The tree was figured and described in 1592 by Prosper Alpinus under the name 'agihalid'. Linnaeus regarded it as a species of Ximenia, but Adanson proposed the new genus of Agialid. The genus Balanites was founded in 1813 by Delile.
The yellow, single-seeded fruit is edible, but bitter. Many parts of the plant are used as famine foods in Africa; the leaves are eaten raw or cooked, the oily seed is boiled to make it less bitter and eaten mixed with sorghum, and the flowers can be eaten. The tree is considered valuable in arid regions because it produces fruit even in dry times. The fruit can be fermented for alcoholic beverages.
Bark extracts and the fruit repel or destroy freshwater snails and copepods, organisms that act as intermediary hosts host the parasites Schistosoma, including Bilharzia, and guinea worm, respectively. Existing worm infections are likewise treated with desert date, as are liver and spleen disorders. A decoction of the bark are also used as an Abortifacient and an antidote for arrow-poison in West African traditional medicine.
The seed contains 30-48% fixed (non-volatile) oil, like the leaves, fruit pulp, bark and roots, and contains the sapogenins diosgenin and yamogenin. Saponins likewise occur in the roots, bark wood and fruit.
The tree is managed through agroforestry. It is planted along irrigation canals and it is used to attract insects for trapping. The pale to brownish yellow wood is used to make furniture and durable items such as tools, and it is a low-smoke firewood and good charcoal. The smaller trees and branches are used as living or cut fences because they are resilient and thorny. The tree fixes nitrogen. It is grown for its fruit in plantations in several areas. The bark yields fibers, the natural gums from the branches are used as glue, and the seeds have been used to make jewelry and beads.
The generic part of the binomial Balanites derives from the Greek word for an acorn and refers to the fruit, this name was coined by Alire Delile in 1813. in Descr. Egypte, Hist. Nat. 221 1813. The specific name aegyptiaca was applied by Carl Linnaeus as the species was initially described from specimens collected in Egypt.
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