Hydrilla verticillata, commonly known as water thyme or Indian star-vine, is an aquatic plant that can grow up to 20 feet in length. It is considered an invasive species in many regions, including North America and Europe. Due to its invasive nature, it has earned various synonyms, such as aquatic weed, waterweed, and oxygen weed. Other synonyms for hydrilla verticillata are common water hyacinth and hyacinth grass. The plant is also known by the common name of water fern, indicating its striking resemblance to ferns, but it is, in fact, a flowering plant. The use of synonyms such as these allows individuals from different regions and backgrounds to communicate about this invasive species with ease.