ABSTRACT
As mentioned earlier, in the course of evolution of angiosperms, the number of stamens in flowers reduced, becoming strictly definite. However, in some evolutionary lines the number of stamens again increased, which is typical for example of Cactaceae and some members of Rosaceae. This increase in number of stamens is associated with the biology of pollination and is normally characteristic of flowers lacking nectar and in which pollen grains serve as an attractant for biotic agents effecting cross pollination.
