Najas, the water-nymphs[3] or naiads, is a genus of aquatic plants. It is cosmopolitan in distribution, first described for modern science by Linnaeus in 1753. Until 1997, it was rarely placed in the Hydrocharitaceae,[4][5][6][7] and was often taken as constituting (by itself) the family Najadaceae.[8]

Illustration Najas marina0.jpg
Najas marina[1]
Scientific classification e
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Alismatales
Family: Hydrocharitaceae
Subfamily: Hydrilloideae
Genus: Najas
L. (1753)
  • Fluvialis Ség
  • Caulinia Willd.
  • Ittnera C.C.Gmel.

The APG II system, of 2003 (unchanged from the APG system, of 1998), places the genus in family Hydrocharitaceae, in the order Alismatales of the monocots.[7]

An infrageneric classification of two sections is proposed: Section Americanae and sect. Caulinia.[9]

  1. Najas affinis Rendle - South America, Senegal, Guinea-Bissau
  2. Najas ancistrocarpa A.Braun ex Magnus - China, Japan, Taiwan
  3. Najas arguta Kunth - Cuba, Costa Rica, Panama, South America
  4. Najas australis Bory ex Rendle - India, Madagascar, Mauritius, KwaZulu-Natal, Seychelles
  5. Najas baldwinii Horn - West Africa
  6. Najas brevistyla Rendle - Assam
  7. Najas browniana Rendle - southern China, India, Taiwan, Java, Cavern Island in Northern Territory of Australia
  8. Najas chinensis N.Z.Wang - Primorye, China, Taiwan, Japan
  9. Najas conferta (A.Braun) A.Braun - Cuba, Hispaniola, Panama, Brazil
  10. Najas faveolata A. Br. ex Magnus
  11. Najas filifolia R.R.Haynes - southeastern United States (Georgia, Alabama, Florida)
  12. Najas flexilis (Willd.) Rostk. & W.L.E. Schmidt (1824) - temperate Northern Hemisphere
  13. Najas gracillima (A.Braun ex Engelm.) Magnus - Asia, North America
  14. Najas graminea Delile (1813) - Africa, Asia, New Guinea, Melanesia, northern Australia; naturalized in California and parts of Europe
  15. Najas grossareolata L.Triest - Sri Lanka
  16. Najas guadalupensis (Spreng.) Magnus - North and South America, Caribbean
  17. Najas hagerupii Horn - Ghana, Mali
  18. Najas halophila L.Triest - Java, New Guinea, Queensland
  19. Najas heteromorpha Griff. ex Voigt - eastern India
  20. Najas horrida A.Braun ex Magnus - Africa, Madagascar, Sinai
  21. Najas indica (Willd.) Cham. (1829) - Indian Subcontinent, China, Southeast Asia, New Guinea
  22. Najas kurziana Rendle - Bihar, East Timor
  23. Najas madagascariensis Rendle - Madagascar; naturalized in Mauritius
  24. Najas malesiana Wilde - India, Bangladesh, Indochina, Malaysia, Indonesia, Philippines; naturalized in eastern Brazil
  25. Najas marina L. (1753) - widespread and nearly cosmopolitan
  26. Najas minor All. (1773) - widespread in Europe, Asia, Africa; naturalized in eastern North America
  27. Najas oguraensis Miki - East Asia, Himalayas (Pakistan, Nepal, northern India)
  28. Najas pectinata (Parl.) Magnus - Sahara
  29. Najas pseudogracillima L.Triest - Hong Kong
  30. Najas rigida Griff. - eastern India
  31. Najas schweinfurthii Magnus - Senegal, Cameroon, Ethiopia, Sudan, Tanzania
  32. Najas tenuicaulis Miki - Honshu Island in Japan
  33. Najas tenuifolia R.Br. - Hong Kong, Southeast Asia, Australia
  34. Najas tenuis Magnus – India, Sri Lanka, Myanmar
  35. Najas tenuissima (A.Braun ex Magnus) Magnus - Finland, Russia, Hokkaido
  36. Najas testui Rendle - western + central Africa
  37. Najas welwitschii Rendle - tropical Africa, western India
  38. Najas wrightiana A.Braun - Mexico, Central America, Cuba, Bahamas, Venezuela; naturalized in Florida


  1. ^ Prof. Dr. Otto Wilhelm Thomé Flora von Deutschland, Österreich und der Schweiz 1885, Gera, Germany
  2. ^ a b Kew World Checklist of Selected Plant Families
  3. ^ "Najas". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 16 July 2015.
  4. ^ Tanaka, Norio; Setoguchi, Hiroaki; Murata, Jin (1997), "Phylogeny of the family hydrocharitaceae inferred fromrbcL andmatK gene sequence data", Journal of Plant Research, 110 (3): 329–337, doi:10.1007/BF02524931, S2CID 10939773
  5. ^ Les, DH; Cleland, MA; Waycott, M (1997), "Phylogenetic studies in Alismatidae, II: Evolution of Marine Angiosperms (Seagrasses) and Hydrophily", Systematic Botany, 22 (3): 443, doi:10.2307/2419820, JSTOR 2419820
  6. ^ Genera of Hydrocharitaceae, GRIN Taxonomy for Plants
  7. ^ a b Angiosperm Phylogeny Group (2003). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG II". Botanical Journal of the Linnean Society 141(4): 399-436. (Available online: Abstract | Full text (HTML) | Full text (PDF)[dead link])
  8. ^ 197. Najadaceae A. L. de Jussieu, Flora of North America
  9. ^ Ito, Y., Nr. Tanaka, S.W. Gale, O. Yano, J. Li (2017) "Phylogeny of Najas (Hydrocharitaceae) revisited: Implications for systematics and evolution". Taxon 66(2): 309-323. doi: 10.12705/662.2

External linksEdit