Abstract: By evolving traits that make them more attractive to potential pollinators, flowers that are primarily outcrossers can boost their fitness by attracting more pollinators to spread pollen to fertilize more ovules.  As a result, pollinators and plants often exist in a dynamic system of coevolution.  Pollinators often exert major selective pressures on the plants that they visit, and floral traits respond by evolving unique and effective techniques for increasing their attractiveness.  Campanula americana is one such plant, and it has evolved a prominent display of pollen on its S-shaped, protruding style.  How do bees respond to this obvious display of pollen? Why is the pollen variable in color, and is this color variation the result of selective pressure exerted by floral visitors? What other factors are also important in pollen dispersal?  Surveys and arrays were used to test these questions in an attempt to discern the importance of some of the factors affecting rates of pollen removal.  From these methods it was found that petal length and corolla color are significant factors in visitor attraction and, therefore, likely affect rates of pollen removal, that flower height was a factor for the Megachelidae, that pollen is an attractant for Halictidae with Halictidae favoring flowers with pollen over those without, and that pollen color is unimportant except in the situation where a Halictidae is asked to differentiate between a flower with pollen and a flower without pollen.  Thus it appears that various visitors interact with the flowers in varying ways.  The tan pollen may be a cryptic response to avoid visitation by the "ugly-pollinator" Halictidae, while petal length and corolla color may be factors boosting overall visitation rates.