Brachystegia spiciformis, also known by the various different spelling versions, Msasa, Missassa and the Sena name N'sassa

Tree

A medium to large tree, 8 to 15 m in height, the branches are heavy, thrusting upwards and outwards, often twisting and curving, giving the tree a beautiful shape. It occurs in open, deciduous woodland, tolerating a wide range of soil types. 

Source - Tress of Southern Africa - Keith Coaetes Palgrave and Meg Coates Palgrave 

Timber

The heartwood is a uniform red/brown and clearly defined. Weighing 975kg/m3 it is a hard timber that turns well, sandpapering and taking oils and varnish well. Tools must be sharp and also used for furniture, railway sleepers and flooring.