Pollination syndromes can be thought of as extremes of a continuum of greater or lesser specialization or generalization onto particular functional groups of pollinators that exert similar selective pressures" and the frequency with which flowers conform to the expectations of the pollination syndromes is relatively rare.
Pollination syndromes represent extreme variations within a continuum where plants exhibit either heightened or reduced specialization towards particular types of pollinators that face comparable selective forces.  The occurrence of flowers aligning perfectly with these syndromes is relatively rare.