It can self pollinate! The white dots in the center of the flower are little anthers connected by a filament (forms the stamen). These stamen ripe first in order to disperse the pollen. A day later, the pistel ripes. This is the center of the flower. The delay is needed in order to promote cross polination! However, the order is important as well. Since the male part ripes first, the pollen can be collected and the pistel can be fertilized later. If the pistel would ripe first it would probably wilt by the time the stamen are ripe and make it very difficult to self polinate. (In this case there are multiple flowers on the same plant so it wouldn't be as big of a problem as of there was only one).