Najas

Short description: Genus of aquatic plants

Najas

Najas marina[1]
Scientific classification
Kingdom:  | Plantae
Clade:  | Tracheophytes
Clade:  | Angiosperms
Clade:  | Monocots
Order:  | Alismatales
Family:  | Hydrocharitaceae
Subfamily:  | Hydrilloideae
Genus:  | Najas
L. (1753)
Synonyms[2]

* Fluvialis Ség
* Caulinia Willd.
* Ittnera C.C.Gmel.

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]

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]

Species[2]

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 W.J.de 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

## References

1. ↑ Prof. Dr. Otto Wilhelm Thomé Flora von Deutschland, Österreich und der Schweiz 1885, Gera, Germany
2. ↑ 2.0 2.1 Kew World Checklist of Selected Plant Families
3. ↑ "Najas". Natural Resources Conservation Service PLANTS Database. USDA. https://plants.usda.gov/core/profile?symbol=NAJAS. 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
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
6. ↑ Genera of Hydrocharitaceae, GRIN Taxonomy for Plants
7. ↑ 7.0 7.1 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)[|permanent dead link|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 links

* Najadaceae in L. Watson and M.J. Dallwitz (1992 onwards) The families of flowering plants : descriptions, illustrations, identification, information retrieval. Version: 9 March 2006. http://delta-intkey.com .
* Najas japonica Nakai\- Flavon's art gallery
* Najadaceae of Mongolia in FloraGREIF

Wikidata ☰ Q159215 entry

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