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]
| Najas | |
|---|---|
| |
| Najas marina[1] | |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Monocots |
| Order: | Alismatales |
| Family: | Hydrocharitaceae |
| Subfamily: | Hydrilloideae |
| Genus: | Najas L. |
| Synonyms[2] | |
| |
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]
- Najas affinis Rendle - South America, Senegal, Guinea-Bissau
- Najas ancistrocarpa A.Braun ex Magnus - China, Japan, Taiwan
- Najas arguta Kunth - Cuba, Costa Rica, Panama, South America
- Najas australis Bory ex Rendle - India, Madagascar, Mauritius, KwaZulu-Natal, Seychelles
- Najas baldwinii Horn - West Africa
- Najas brevistyla Rendle - Assam
- Najas browniana Rendle - southern China, India, Taiwan, Java, Cavern Island in Northern Territory of Australia
- Najas chinensis N.Z.Wang - Primorye, China, Taiwan, Japan
- Najas conferta (A.Braun) A.Braun - Cuba, Hispaniola, Panama, Brazil
- Najas faveolata A. Br. ex Magnus
- Najas filifolia R.R.Haynes - southeastern United States (Georgia, Alabama, Florida)
- Najas flexilis (Willd.) Rostk. & W.L.E. Schmidt - temperate Northern Hemisphere
- Najas gracillima (A.Braun ex Engelm.) Magnus - Asia, North America
- Najas graminea Delile - Africa, Asia, New Guinea, Melanesia, northern Australia; naturalized in California and parts of Europe
- Najas grossareolata L.Triest - Sri Lanka
- Najas guadalupensis (Spreng.) Magnus - North and South America, Caribbean
- Najas hagerupii Horn - Ghana, Mali
- Najas halophila L.Triest - Java, New Guinea, Queensland
- Najas heteromorpha Griff. ex Voigt - eastern India
- Najas horrida A.Braun ex Magnus - Africa, Madagascar, Sinai
- Najas indica (Willd.) Cham. - Indian Subcontinent, China, Southeast Asia, New Guinea
- Najas kurziana Rendle - Bihar, East Timor
- Najas madagascariensis Rendle - Madagascar; naturalized in Mauritius
- Najas malesiana W.J.de Wilde - India, Bangladesh, Indochina, Malaysia, Indonesia, Philippines; naturalized in eastern Brazil
- Najas marina L. - widespread and nearly cosmopolitan
- Najas minor All. - widespread in Europe, Asia, Africa; naturalized in eastern North America
- Najas oguraensis Miki - East Asia, Himalayas (Pakistan, Nepal, northern India)
- Najas pectinata (Parl.) Magnus - Sahara
- Najas pseudogracillima L.Triest - Hong Kong
- Najas rigida Griff. - eastern India
- Najas schweinfurthii Magnus - Senegal, Cameroon, Ethiopia, Sudan, Tanzania
- Najas tenuicaulis Miki - Honshu Island in Japan
- Najas tenuifolia R.Br. - Hong Kong, Southeast Asia, Australia
- Najas tenuis Magnus – India, Sri Lanka, Myanmar
- Najas tenuissima (A.Braun ex Magnus) Magnus - Finland, Russia, Hokkaido
- Najas testui Rendle - western + central Africa
- Najas welwitschii Rendle - tropical Africa, western India
- Najas wrightiana A.Braun - Mexico, Central America, Cuba, Bahamas, Venezuela; naturalized in Florida
References
edit- ^ Prof. Dr. Otto Wilhelm Thomé Flora von Deutschland, Österreich und der Schweiz 1885, Gera, Germany
- ^ a b Kew World Checklist of Selected Plant Families
- ^ USDA, NRCS (n.d.). "Najas". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 16 July 2015.
- ^ 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, Bibcode:1997JPlR..110..329T, doi:10.1007/BF02524931, S2CID 10939773
- ^ 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
- ^ Genera of Hydrocharitaceae, GRIN Taxonomy for Plants
- ^ 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])
- ^ 197. Najadaceae A. L. de Jussieu, Flora of North America
- ^ 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
edit- Najadaceae Archived 2009-02-01 at the Wayback Machine in L. Watson and M.J. Dallwitz (1992 onwards) The families of flowering plants Archived 2007-01-03 at the Wayback Machine: descriptions, illustrations, identification, information retrieval. Version: 9 March 2006. http://delta-intkey.com Archived 2007-01-03 at the Wayback Machine.
- Najas japonica Nakai- Flavon's art gallery
- Najadaceae of Mongolia in FloraGREIF