Abstract: The light environment experienced by a plant may influence the number of pollinator visits due to the intrinsic properties of plants grown in the sun versus those grown in the shade. For example, populations of Campanula americana growing in the sun tend to be larger and have larger floral displays then plants growing in the shade, and larger floral displays attract more pollinators on average then smaller ones. However, recent evidence has shown that certain pollinators prefer to forage in the sun depending upon the thermal biology of the insect. Therefore, populations of plants growing in the sun may experience entirely different pollinators than plants growing in the shade, rather than simply different abundances of pollinators. The following study examined the type and abundance of pollinators foraging on plants in the sun and the shade as a consequence of different floral display sizes. The irradiance level had a significant effect on the foraging behavior of bumblebees. Plants in the sun were visited by more bees than plants in the shade, and flowers on plants in the sun were visited more often than flowers on plants in the shade. The movement of pollinators between arrays of plants growing in the sun and in the shade was also observed, testing for the influence of different floral display sizes on foraging behavior. When comparing plants of equal floral display size, there was a higher probability that a bee would move from the shade to the sun than from the sun to the shade. However, little movement was observed between the sun and the shade in a natural population of plants. The limited flow of pollen between natural plants in the sun and the shade may serve as a potential for assortative mating and, therefore, the specialization of gene pools to a local environment.