The ecology of plant-pollinator interactions. Formation of pollination ecotypes. Pollinator-driven speciation in plants. Plant breeding systems and ecological determinants of fruit and seed set. Floral mimicry in orchids and milkweeds. Coevolution of flowers and insects. Interpretation of trait evolution using phylogenetic analysis. Convergent evolution in plants with specialized pollination systems. Chemical ecology of pollination systems. Breakdown of plant-insect mutualisms in degraded landscapes. Reproductive systems of invasive plants.