The bark of Acacia tortillis has a rough feel and is grey to black in colour. The tree has a combination of one straight thorn with a small hooked thorn alongside. The thorns are thin and grow in pairs. The flowers form in clusters on old wood. The flowers themselves are creamy, white, balls. The pods are a distinctive pale, gold brown colour and are curled and twisted. The leaves are very small giving the umbrella a soft, feathery appearance. Browsing animals eat the leaves together with the thorns, the latter more easily when young and soft. The older, hardened thorns can be a deterrent to over-browsing. The thorns are sharp and white, with some straight and others hooked. They are arranged singly or in pairs. The tree flowers in December (summer) with dense, packed white florets, but the flowering can be sporadic depending upon rain. It has the classic, umbrella-shaped canopy associated with thorn trees. It reaches heights of between 5-20 m in nature. Many bird species take advantage of this protection and build their nests in the canopy. It is fairly slow growing and reaches a final height of between 3-5 m with a spread of 8-13 m. Flowers and Fruit Acacia tortilis (Umbrella Thorn) produces a large number of pods that are eaten by wild and domestic animals, and sometimes by man. The pods are tightly coiled spirals, pale brown and fall to the ground unopened. They accumulate in large numbers and are eaten with relish by such animals as Kudu, Impala, Rhino and Elephant. This is the manner in which the seeds of the unopened pod are dispersed for propagation and better germination after passing through an animals stomach. The pods of some other acacia trees split before falling to the ground, thus dispersing the seeds by scattering.
Posted on: Fri, 23 Jan 2015 07:03:08 +0000
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