Acacia seyal

Vachellia seyal, the red acacia, known also as the shittah tree (the source of shittim wood), is a thorny, 6–10 m (20–33 ft) high tree with a pale greenish or reddish bark. At the base of the 3–10 cm (1.2–3.9 in) feathery leaves there are two straight, light grey thorns, growing to 7–20 cm (2.8–7.9 in) long. The blossoms are displayed in round, bright yellow clusters approximately in 1.5 cm (0.59 in) diameter. In Vachellia seyal var. fistula, which is more common on heavy clay soils, some of the thorns are swollen and house symbiotic ants. It is distributed from Egypt to Kenya and west Senegal. In the Sahara, it often grows in damp valleys. It is also found at wadis in the Arabian Peninsula. Two varieties are recognized: Vachellia seyal occasionally hybridizes with V. xanthophloea. Vachellia seyal is, along with other Vachellias, an important source for gum arabic, a natural polysaccharide, that exudes from damaged stems and solidifies.The gum of Vachellia seyal is called gum talha, from the Arabic name of the tree: ( Talh). Parts of the tree have a tannin content of up to 18-20%. The bark and seed pods of Vachellia seyal var. seyal have a tannin content of about 20%. Wood from the tree is said to have been used in Ancient Egypt to make coffins and also the Ark of the Covenant.