NAS - Nonindigenous Aquatic Species

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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 where they compete with and often displace native species. Hydrilla (Hydrilla verticillata), water-hyacinth (Eichhornia crassipes) and Eurasian watermilfoil (Myriophyllum spicatum) are examples well known for their ability to alter physical and biological functions of aquatic systems.
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Data Queries and Species Lists

Plant picture Data Queries
Species List of Nonindigenous Plants
(links to factsheets and collection information)

Links to News and Other Information

Deeprooted Sedge Cyperus entrerianus: An Overlooked Aggressive Weed in the southeastern United States (pdf poster) *
Marsh sowthistle Sonchus palustris: Present in Canada, not known to occur in the United States (ID Alert Poster!) - jpg 201kb

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