Today’s cultivated peanut plants are a hybrid of two very similar wild plants, Arachis duranensis and Arachis ipaensis. So, researchers led by David Bertioli of the Universidade de Brasília and the University of Georgia, working with the International Peanut Genome Initiative, used the genomes of the wild plants as a first step in mapping the two separate sub-genomes carried by the modern peanut.