The genus Arachis contains about 70 species, including A. hypogaea (cultivated peanut) and its two probable progenitors, A. duranensis and A. ipaensis. These species and a few other important relatives (used as sources of disease resistance and in mapping experiments) are described in the links below.
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More about Arachis ... A short review on 'Arachis duranensis, Arachis ipaensis, and the Origins of Cultivated Peanut' (PDF)