Intraspecific divergence in floral‐tube length promotes asymmetric pollen movement and reproductive isolation

Summary The causative link between phenotypic divergence and reproductive isolation is an important but poorly understood part of ecological speciation. We studied the effects of floral‐tube length variation on pollen placement/receipt positions and reproductive isolation. In a population of Lapeirousia anceps (Iridaceae) with bimodal floral‐tube lengths, we labelled pollen of short‐ and long‐tubed flowers with different colour fluorescent...