 The stamens are modified to produce pollen in clusters called pollinia, which become attached to insects that crawl into the flower.The flower shapes may force insects to pass by the pollen, which is "glued" to the insect.Some orchids are even more highly specialized, with flower shapes that mimic the shape of insects to attract them to attempt to 'mate' with the flowers, a few even have scents that mimic insect pheromones.