I found these e-books online at the National Academic Press webpage: The Lost crops of Africa. I. Grains, II. Vegetables, III. Fruits.
http://www.nap.edu/catalog.php?record_id=2305
http://www.nap.edu/catalog.php?record_id=11763
http://www.nap.edu/catalog.php?record_id=11879
Surely a interesting resource for those who are interested in tropical wild food conservation, diversification or just plain cultivation. I am sure there are some pretty drought hardy species among those listed.
You can log-on as guest and download the pdf's for free if you live in a developing nation (not sure how they check this: perhaps by IP address, perhaps not).
Daniel
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