(Willd.) Rostk. & Schmidt
Caulinia flexilis Willd.
Najas flexilis is an aquatic annual plant native to parts of North America and Europe. It is native to northern and Central Europe from Norway to Ireland to Switzerland, and from there across Russia and Siberia. It is also considered native throughout most of Canada, and the northern United States in disjunct populations in southern California, Arizona, Missouri, South Carolina and Utah. Its common names include slender naiad and nodding waternymph.
Najas flexilis inhabits shallow bodies of brackish and fresh water such as lakes and bays. It is also native to northern Europe, where its range includes Scotland, Poland and Sweden. It is rare in the European portion of its range and is strictly protected by Appendix I of the Berne Convention. The largest population is in Lake Sīveri in Latvia.
- Biota of North America Program, Najas flexilis Image
- "World Checklist of Selected Plant Families: Royal Botanic Gardens, Kew". apps.kew.org. Retrieved 2017-01-31.
- Friedrich Wilhelm Bottlieb Theophil Rostkovius & Wilhelm Ludwig Ewald Schmidt. 1824. Flora Sedinensis 382, Najas flexilis
- Carl Ludwig von Willdenow. 1801. Mémoires de l'Académie Royale des Sciences et Belles-Lettres depuis l'Avénement de Fréderic Guillaume II au Thrône 1798: 89, pl. 1, f. 19. 1798.
- United States Department of Agriculture (1971), Common Weeds of the United States, New York: Dover Publications, ISBN 0-486-20504-5
- Reed, Denise, Wildlife of the Lunan Lochs, retrieved 2007-05-10
- Thiry, Emmanuel (coordination); van de Weyer, Klaus (17 Feb 2005), Re-Establishment Plan for the Natura 2000 Species Najas flexilis in Poland (PDF), retrieved 2007-05-10
- Jacobsson, Anders (2005), Sjönajas återfunnen i Södra Kärrlången. [Najas flexilis rediscovered in Södermanland, southeast Sweden.] (PDF), retrieved 2008-04-16