Genus Groenlandia is a group of aquatic plants that consists of only three species. These plants are found in different regions of the world, including North America, Asia, Europe, and Africa. The plants in this genus are often referred to by their common name, waterwort. The term waterwort refers to the plant's habit of growing in or near water, and its leaves' resemblance to those of terrestrial wort plants. Other synonyms for this genus include the scientific names of the three species that make up this genus - Groenlandia densa, Groenlandia elongata, and Groenlandia occidentalis. These plants are commonly used in aquatic gardens and water features, making them a popular choice among plant enthusiasts.