It would made sense to me that we should be eating foods that are 
native to Africa. I came upon a series of three books on the Lost 
Crops of Africa. They are on grains, vegetables, and fruits.

The paperbacks are expensive, but you can read them online for free. 
This is the link to the vegetables one:

http://www.nap.edu/catalog.php?record_id=11763

Links to the others are on the page.