The chief trade is in, and the principal exports are, palm oil and kernels, rubber, cotton, maize, groundnuts (Arachis), shea-butter from the Bassia parkii (Sapotaceae), fibres of the Raphia vinifera, and the Sansevieria guineensis, indigo, and kola nuts, ebony and other valuable wood.
Shea (London, 1832) (Oriental Translation Fund); L'Histoire de la dynastic des Sassanides, by S.
Shea, New York, 1866, 6 vols.) is a famous old work, but now negligible.
Large areas are covered with brushwood, among which are scattered baobab, shea-butter, bread fruit, corkwood and silk-cotton trees.