Linguistic evidence for the use of some tree and tuber food plants in southern Nigeria

It is generally recognized that archaeological evidence of tubers or their cultivation is difficult to find (Coursey 1976, p. 396). The same problem applies to crops from trees which are protected but not cultivated if their seeds do not survive in an archaeological context. It is therefore important to investigate linguistic evidence which could help in the study of the use, domestication or introduction of such crops.