Water lilies are freshwater plants with rounded, floating leaves that can often be observed floating atop ponds all over the world. The genus name Nymphaea is derived from the water nymphs of ancient Greek mythology, which were characterized by their chastity and purity.

Generally perennial, water lilies produce beautiful, solitary flowers that usually rest at the surface of the water. Arranged in a spiral, their numerous petals form a cuplike shape. The leaves of the plants are coated in a waxy substance and contain many air spaces, which make them buoyant. Both the leaves and flowers are attached to long stalks that extend from creeping underwater stems, which are rooted in the mud.

Water lilies play a significant role in their environment. The plants provide small aquatic animals with a place to hide and, therefore, also attract greater numbers of larger carnivores. Moreover, water lilies are frequently food for other creatures and keep water cool by providing shade. Yet, water lilies are not always beneficial. They can sometimes cause drainage problems due to their rapid growth and may displace native species in areas where the plants are introduced.