Pollinators exert selection on floral traits in a pollen-limited, narrowly endemic spring ephemeral.

Results demonstrate that pollinators mediate the strength and mode of selection on floral traits in T. discolor. Interannual variation in the strength, mode, and direction of pollinator-mediated selection on floral traits could be important for maintaining of floral diversity in this system. Observed levels of antagonism were weak agents of selection on floral traits. This article is protected by copyright. All rights reserved.