Complete autogamy is uncommon since it involves the simultaneous production of pollen and stigma.
Chasmogamous flowers show complete autogamy rarely.
Cleistogamous flowers, which do not open and have the anther and stigma in close proximity, exhibit complete autogamy.
Autogamy:
Autogamy is a reproductive strategy used by many flowering plants that involve self-fertilization or the fusing of two gametes from the same organism.
It is critical for flowering plants not to be reliant on pollination agents that require fertilization from other plants, and it is unusual to find many plant species that have evolved to be incompatible.