Abstract
Several commercial varieties of Oxalis were used to exarnine the chromosome numbers and to clear up the heavy sterility. Oxalis bowieana, O. cernua var, flore-pleno, and O. variabilis were tetraploid (2n=28), and O. cernua was pentaploid (2n=35). Furthermore, O. versicolor was triploid (2n=27) and O. hirta was allohexaploid (2n=30). Each of these two species was composed with the different kind of genome from the former, respectively. Severe seed-sterility observed in all varieties was caused chiefly by the destructive gametogenesis due to polyploidy, in addition to the self-incompatibility connected with trimorphic stylism.
