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The karyotypes of six species of Phaseolus were analyzed. The chromosome complements consist exclusively of metacentric and submetacentrics, their size ranging from 0.70 μm in P. microcarpus to 1.60 μm in P. coccineus. A suggested path of karyologic change is through an increment in the chromatin’s total length. Based upon their karyotypic formula and centromeric index, Phaseolus xanthotrichus is considered the most evolved species, and P. microcarpus the least advanced.