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Phaseolus beans are important crops for human nutrition and models for domestication due to multiple events. Common bean (P. vulgaris) is also a reference genome for investigating genome evolution in legumes. Most of the genus is diploid (2n = 22) with small genomes (ca. 600 Mbp), except for the dysploid Leptostachyus group (2n = 20), which experienced genome restructuring in a short period of time. We explored oligo-FISH barcode and painting, associated with comparative genomic data, to identify structural rearrangements within the genus and among legumes and to reconstruct chromosome evolution in the group. In this talk, we will discuss its dynamics in the absence of recent whole genome duplications.