NAS logo - click to go to the NAS home page Aquatic vascular plants include the ferns and flowering plants that grow submersed in water, float on the water surface, or have basal portions inundated with foliage and upper parts emersed. Diverse in form and habit, many aquatic species have become established in the United States outside of their natural range. Introduced intentionally or escaping from cultivation, nonindigenous plants can colonize aquatic communities. Hydrilla (Hydrilla verticillata), waterhyacinth (Eichhornia crassipes), and Eurasian watermilfoil (Myriophyllum spicatum) are examples well known for their ability to establish permanent populations.
We welcome any contributions or comments you may have.
More plant species are forthcoming as we update their distributions and profile pages.

Data Queries and Species Lists

Plant picture

Species List of Nonindigenous Plants
(links to species distributions, profiles, and collection information)

Links to News and Other Information




The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. We highly recommend reviewing metadata files prior to interpreting these data.

Citation information: U.S. Geological Survey. [2024]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [4/24/2024].

Contact us if you are using data from this site for a publication to make sure the data are being used appropriately and for potential co-authorship if warranted.

For general information and questions about the database, contact Wesley Daniel. For problems and technical issues, contact Matthew Neilson.