When pollinators visit the flowers, their legs slip off of the stout column and fall into slits where the pollen sacs are located. The hairs or projections on the insects' legs catch these pollen sacs, and as the insect pulls its leg free of the slit, the pollen sacs are removed. As the pollinator visits another plant of the same species, the pollen sacs break off on the column, and the pollen grains grow down the style and fertilize the flower's ovary. I the insect cannot pull its leg free, due to the added weight of the pollen sacs, it may become trapped and perish on the flower.