Reproductive character displacement and potential underlying drivers in a species-rich and florally diverse lineage of tropical angiosperms (; Acanthaceae).

Reproductive character displacement is a pattern whereby sympatric lineages diverge more in reproductive character morphology than allopatric lineages. This pattern has been observed in many plant species, but comparably few have sought to disentangle underlying mechanisms. Here, in a diverse lineage of Neotropical plants (; Acanthaceae), we present evidence of reproductive character displacement in a macroevolutionary framework (i.