This is a fine example of the carvings of the Makonde Tribe of Southeast Tanzania. The style is called Dimoongo, Tree of Life. The family tree is known as Ujamaa, which is the fourth principle of Kwanzaa and means togetherness and family in Kiswahili. This art represents the extended African family living and working together to achieve the common goal of nurturing and caring for the family. 
Carved from Mbingo (African Blackwood, similar to Ebony).
13.5"H x 4.5"W x 2"D