The petals, for example, may serve as a landing platform for a visiting insect. When a bee lands on the lower petal of a snapdragon, its weight causes a stamen to swing down and dust the bee with pollen. Petals of many plant species even have lines or other marks that guide the pollinator to the nectar. Another type of lure is aroma. A flower's scent must appeal to its pollinator.
Many people appreciate the sweet smell of honeysuckle on a midsummer night.
While most flowers have a sweet, pleasant fragrance, there are exceptions.