Co‐flowering with congeners does not affect buzz‐pollinator specialization and pollination performance in <i>Rhexia mariana</i> , but does affect floral trait variance

We did not find support for either negative or positive effects of co-flowering on pollination performance in Rhexia mariana, indicating that co-flowering may instead have neutral effects. Negative effects of co-flowering with close relatives hence do not seem to be strong enough to drive specialization on distinct buzzing bee pollinators in Rhexia. Sampling across more localities, paired with experimental approaches (e.g., manipulating co-flowering density, assessing post-zygotic reproductive barriers) will be essential to clarify whether reproductive interference through co-flowering is indeed low.