AbstractThree species of the genusPhaseolusL. are reported upon.1)Phaseolus lathyroidesL. the name of which seems to be synonymous withPh. semi‐erectusL., has 2n = 22. This is in accordance with previous counts.2)Phaseolus hysterinusDur. has 2n = 22, but many cells in the inner cortical layer of the root are polysomatic.3)Material ofPhaseolus sublobatusRoxb., a species recently studied by DATTA&SEN, has been studied again: 2n = 22 and in a small number of seeds 2n = 44 could be reported, hence a case of spontaneous tetraploidy inPhaseolus.Owing to the smallness of the chromosomes a complete analysis of the karyotype is nowhere attempted at and seems of dubious value for breeding work. At most can be stated that all three species in diploid condition show one large pair and one satellited pair of somewhat smaller chromosomes. These are present twice in the tetraploi