Hydrocharitaceae is a family of aquatic plants that are commonly known as tape-grasses. These plants are found in freshwater habitats such as lakes, ponds, and rivers. The family consists of around 18 genera and about 120 species. Some of the synonyms for Hydrocharitaceae include the water-nymph family, the frog's-bit family, and the duckweed family. These plants are known for their floating leaves and submerged roots, and they play an important role in the ecology of aquatic ecosystems. The Hydrocharitaceae family is widespread and found in many regions of the world, including Asia, Africa, Europe, and the Americas.