Najas


Najas, the water-nymphs 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,] and was often taken as constituting the family Najadaceae.
The APG II system, of 2003, places the genus in family Hydrocharitaceae, in the order Alismatales of the monocots.
An infrageneric classification of two sections is proposed: Section Americanae and sect. Caulinia.
;Species
  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 - Cuba, Hispaniola, Panama, Brazil
  10. Najas faveolata A. Br. ex Magnus
  11. Najas filifolia R.R.Haynes - southeastern United States
  12. Najas flexilis Rostk. & W.L.E. Schmidt - temperate Northern Hemisphere
  13. Najas gracillima Magnus - Asia, North America
  14. Najas graminea Delile - Africa, Asia, New Guinea, Melanesia, northern Australia; naturalized in California and parts of Europe
  15. Najas grossareolata L.Triest - Sri Lanka
  16. Najas guadalupensis 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 Cham. - 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 W.J.de Wilde - India, Bangladesh, Indochina, Malaysia, Indonesia, Philippines; naturalized in eastern Brazil
  25. Najas marina L. - widespread and nearly cosmopolitan
  26. Najas minor All. - widespread in Europe, Asia, Africa; naturalized in eastern North America
  27. Najas oguraensis Miki - East Asia, Himalayas
  28. Najas pectinata 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 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