"Najas" is a botanical term that refers to a genus of aquatic plants commonly known as "water nymphs." It is often used to describe the plant species in the family Hydrocharitaceae, which is found in freshwater habitats such as lakes, ponds, and rivers. Some synonyms for "najas" include "waterweed," "pondweed," "hydrilla," "elegant water nymph," and "starwort." These terms are used interchangeably and serve to describe the various species of aquatic plants that fall under the genus Najas. Some of these species are important components of freshwater ecosystems, providing oxygen and shelter for aquatic animals while also serving as food for fish and other aquatic organisms.