''Najas'', the water-nymphs or naiads, is a genus of

aquatic plant Aquatic plants are plants that have adapted to living in aquatic environments (saltwater or freshwater). They are also referred to as hydrophytes or macrophytes to distinguish them from algae and other microphytes. A macrophyte is a plant that ...

s. It is

cosmopolitan Cosmopolitan may refer to: Food and drink * Cosmopolitan (cocktail), also known as a "Cosmo" History * Rootless cosmopolitan, a Soviet derogatory epithet during Joseph Stalin's anti-Semitic campaign of 1949–1953 Hotels and resorts * Cosmopoli ...

in distribution, first described for modern science by Linnaeus in 1753. Until 1997, it was rarely placed in the Hydrocharitaceae,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
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and was often taken as constituting (by itself) the family Najadaceae.197. Najadaceae A. L. de Jussieu
''

Flora of North America The ''Flora of North America North of Mexico'' (usually referred to as ''FNA'') is a multivolume work describing the native plants and naturalized plants of North America, including the United States, Canada, St. Pierre and Miquelon, and Greenla ...

'' 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. An infrageneric classification of two sections is proposed: Section ''Americanae'' and sect. ''Caulinia''.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
/ref> ;Species # ''

Najas affinis ''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,Angiosperm Phylogeny Grou ...

'' Rendle - South America, Senegal, Guinea-Bissau # ''

Najas ancistrocarpa ''Najas ancistrocarpa'' is a species of aquatic plant in the Hydrocharitaceae family. It grows in fresh water ponds and is a native to Japan (Honshu) and to parts of China (Fujian, Hubei, Jiangxi, Taiwan, Zhejiang Zhejiang ( or , ; , als ...

'' A.Braun ex Magnus - China, Japan, Taiwan # ''

Najas arguta ''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,Angiosperm Phylogeny Grou ...

'' Kunth - Cuba, Costa Rica, Panama, South America # ''

Najas australis ''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,Angiosperm Phylogeny Grou ...

'' Bory ex Rendle - India, Madagascar, Mauritius, KwaZulu-Natal, Seychelles # ''

Najas baldwinii ''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,Angiosperm Phylogeny Grou ...

'' Horn - West Africa # '' Najas brevistyla'' Rendle - Assam # ''

Najas browniana ''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,Angiosperm Phylogeny Grou ...

'' Rendle - southern China, India, Taiwan, Java, Cavern Island in Northern Territory of Australia # '' Najas chinensis'' N.Z.Wang - Primorye, China, Taiwan, Japan # ''

Najas conferta ''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,Angiosperm Phylogeny Grou ...

'' (A.Braun) A.Braun - Cuba, Hispaniola, Panama, Brazil # ''

Najas faveolata ''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,Angiosperm Phylogeny Grou ...

'' A. Br. ex Magnus # ''

Najas filifolia ''Najas filifolia'', the needleleaf waternymph, is an aquatic plant in the Hydrocharitaceae. It is a rare and little-known species, known from only three counties (Decatur County, Georgia; Santa Rosa County, Florida Florida is a state loc ...

'' R.R.Haynes - southeastern United States (Georgia, Alabama, Florida) # ''

Najas flexilis ''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 (including Siberia). It is also considered ...

'' (Willd.) Rostk. & W.L.E. Schmidt (1824) - temperate Northern Hemisphere # ''

Najas gracillima ''Najas gracillima'', the slender waternymph, is a submerged species of aquatic plant in the Hydrocharitaceae family. found in lakes and streams. It is native to China (Fujian, Guangxi, Guizhou, Hainan, Hebei, Hubei, Jiangxi, Jilin, Liaoning, Ne ...

'' (A.Braun ex Engelm.) Magnus - Asia, North America # '' Najas graminea'' Delile (1813) - 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. (1829) - Indian Subcontinent, China, Southeast Asia, New Guinea # ''

Najas kurziana ''Najas kurziana'', called the Bihar water nymph, is an aquatic plant growing in fresh water ponds. It is a rare and little-known species known from East Timor and from the State of Bihar in India. The species was initially discovered between Ki ...

'' Rendle - Bihar, East Timor # ''

Najas madagascariensis ''Najas madagascariensis'', called the Madagascar water nymph, is an aquatic plant growing in fresh water ponds. It is native known from Madagascar and naturalized on the Island of Mauritius Mauritius ( ; french: Maurice, link=no ; mfe, l ...

'' Rendle - Madagascar; naturalized in Mauritius # ''

Najas malesiana ''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,Angiosperm Phylogeny Grou ...

'' W.J.de Wilde - India, Bangladesh, Indochina, Malaysia, Indonesia, Philippines; naturalized in eastern Brazil # ''

Najas marina ''Najas marina'' is a species of aquatic plant known by the common names spiny water nymph, spiny naiad and holly-leaved naiad. It is an extremely widespread species, reported across Europe, Asia, Africa, Australia, the Americas and many oceani ...

'' L. (1753) - widespread and nearly cosmopolitan # '' Najas minor'' All. (1773) - widespread in Europe, Asia, Africa; naturalized in eastern North America # ''

Najas oguraensis ''Najas'', the water-nymphs or naiads, is a genus of aquatic plants. It is cosmopolitan (distribution), cosmopolitan in distribution, first described for modern science by Carl Linnaeus, Linnaeus in 1753. Until 1997, it was rarely placed in th ...

'' Miki - East Asia, Himalayas (Pakistan, Nepal, northern India) # ''

Najas pectinata ''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,Angiosperm Phylogeny Grou ...

'' (Parl.) Magnus - Sahara # ''

Najas pseudogracillima ''Najas pseudogracillima'', called the Hong Kong water nymph, is an aquatic plant growing in fresh water ponds. It is a rare and little-known species known from one collection from a pond on the campus of Chung Chi College at the Chinese Universi ...

'' L.Triest - Hong Kong # ''

Najas rigida ''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,Angiosperm Phylogeny Grou ...

'' Griff. - eastern India # '' Najas schweinfurthii'' Magnus - Senegal, Cameroon, Ethiopia, Sudan, Tanzania # ''

Najas tenuicaulis ''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,Angiosperm Phylogeny Gr ...

'' Miki - Honshu Island in Japan # ''

Najas tenuifolia ''Najas tenuifolia'' is an aquatic plant growing in fresh water ponds. It is a native to Hong Kong, Thailand, Indonesia (Java, Maluku, Sulawesi, Bali, Lombok, Timor), the Philippines and Australia (every state and territory except Tasmania). Va ...

'' R.Br. - Hong Kong, Southeast Asia, Australia # ''

Najas tenuis ''Najas tenuis'' is a species of aquatic plant found in freshwater habitats, especially still or slow-moving waters, like ponds and rice fields. Description Distribution and habitat The natural distribution of this annual plant is India and M ...

'' Magnus – India, Sri Lanka, Myanmar # ''

Najas tenuissima ''Najas tenuissima'' is a species of flowering plant belonging to the family Hydrocharitaceae. Its native range is Finland to European Russia, Russian Far East The Russian Far East (russian: Дальний Восток России, r=Dal ...

'' (A.Braun ex Magnus) Magnus - Finland, Russia, Hokkaido # ''

Najas testui ''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,Angiosperm Phylogeny Grou ...

'' Rendle - western + central Africa # ''

Najas welwitschii ''Najas'', the water-nymphs or naiads, is a genus of aquatic plants. It is cosmopolitan (distribution), cosmopolitan in distribution, first described for modern science by Carl Linnaeus, Linnaeus in 1753. Until 1997, it was rarely placed in th ...

'' Rendle - tropical Africa, western India # ''

Najas wrightiana ''Najas wrightiana'' is a species of aquatic plant in the Hydrocharitaceae family. It is referred to by the common name Wright's waternymph, and is found in lakes and streams. It is native to Mexico, Guatemala, Belize, Honduras, the Bahamas, Cuba ...

'' A.Braun - Mexico, Central America, Cuba, Bahamas, Venezuela; naturalized in Florida

References

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 .

Flavon's art gallery
Najadaceae of Mongolia in FloraGREIF
{{Taxonbar, from=Q159215 Aquatic plants Hydrocharitaceae genera Taxa named by Carl Linnaeus