they are pollinated by a small beetle. The reproductive parts are enclosed in a 'petal' in the centre of the flower. You would have to be very gentle to open the part up to get at the pollen and stigma.

Thanks Seaburngirl. I often wondered why my Bizzie Lizzies seldom made seeds. A few years back, during a hot summer, they seeded like mad. The seeds dried up and snapped open with a tiny noise. No plants resulted from this at all. Even Alf's window box Lizzies seeded next door. Saved seeds didn't germinate either. Then I'm no good at getting seeds to produce anything hardly ever.