Abstract: The three sister species of Silene , S. stellata , S. caroliniana , and S. virginica all exhibit different pollination syndromes. S. stellata shows signs of being a moth pollination syndrome plant, while S. caroliniana shows traits of a typical bee pollination syndrome plant, and lastly S. vriginica shows traits of being a hummingbird pollinated plant. Our focus in this study is on the adaptive pressures that hummingbird place on the plants that they pollinate. We believe that hummingbirds are acting as selective agents in the floral design of the flowers they pollinate. Hummingbird pollinated plant species tend to share some, if not all of the following traits (red floral color, tube like corolla, deeply held nectar stores) (Johnson and Steiner 2000, Castellanos et al 2004, and Fenster and Dudash 2001). Focusing on the variation found between the three sister species, we used artificial flowers to recreate some of the background variation that was believed to be present with their most closely related ancestor. We used a blending of combinations for flower color, flower height, inflorescence architecture, presentation, and tube width within the artificial flowers. Hummingbird selection for the varied traits was found to be significant at several levels. Hummingbirds prefered to visit tall, red flowers, but visit frequency and significance levels varied depending on the combination of background trait variation. The most visited significant combination reflected the traits exhibited in natural populations of S. virginica.