Genus Samolus, commonly known as water pimpernel, is a group of aquatic and semi-aquatic plants that belong to the family Primulaceae. The genus comprises approximately seven species that are distributed throughout the world. Although more commonly referred to as water pimpernel, the genus has a range of synonyms such as Samolus fluitans, Samolus repens, and Samolus floridanus. The water pimpernel is a herbaceous perennial often found in shallow water near lakes or rivers. Its leaves are oval and glossy, and the plant typically bears small white or pink flowers. These synonyms help to identify and classify different species of water pimpernel and are important for botanists studying the flora of aquatic ecosystems.