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Peanut (Arachis hypogaea L.)
http://www.h.chiba-u.ac.jp/crop/Students/senoo/en%20sachi2.html
Photographs of the plants, flower and fruit.
The Incredible Peanut
http://www.siu.edu/~ebl/leaflets/peanut.htm
History of human use of Arachis hypogaea.