In flowering plants with specialized pollination, a tight fit is expected between floral and pollinator morphologies, and variation in flower size is likely to be maladaptive because pollinators remain of more or less...
It has generally been considered that the flowers of Scrophularia are mainly pollinated by wasps. Ortega-Olivencia et al. study the four species with the largest and most striking flowers in Europe and Macaronesia (S...