Najas guadalupensis

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Najas guadalupensis
Najas guadalupensis NRCS-1.jpg
Scientific classification e
Kingdom: Plantae
Clade: Angiosperms
Clade: Monocots
Order: Alismatales
Family: Hydrocharitaceae
Genus: Najas
Species: N. guadalupensis
Binomial name
Najas guadalupensis
(Spreng.) Magnus
  • Caulinia guadalupensis Spreng.
  • Najas arcana Subils & Hunz.
  • Najas flexilis var. guadalupensis (Spreng.) A.Braun
  • Najas microdon A.Braun
  • Najas microdon var. curassavica (A.Braun) A.Braun
  • Najas microdon var. guadalupensis (Spreng.) Morong
  • Najas punctata (A.Braun) Rendle
  • Najas urbaniana O.Schmidt

Najas guadalupensis is a species of aquatic plant known by the common names southern waternymph,[2] guppy grass, najas grass, and common water nymph. It is native to the Americas, where it is widespread. It is considered native to Canada from Alberta to Quebec, and most of the contiguous United States, Mexico, Central America, the West Indies and South America. It has been introduced in Japan, Israel and Palestine.[3]

Najas guadalupensis is an annual, growing submerged in aquatic habitat types such as ponds, ditches, and streams. It produces a slender, branching stem up to 60 to 90 centimeters in maximum length. The thin, somewhat transparent, flexible leaves are up to 3 centimeters long and just 1 or 2 millimeters wide. They are edged with minute, unicellular teeth. Tiny flowers occur in the leaf axils; staminate flowers grow toward the end of the plant and pistillate closer to the base.[3][4][5][6][7]


Numerous varietal and subspecific names have been proposed. Only 4 are currently recognized:[1][8]


  1. ^ a b The Plant List
  2. ^ "Najas guadalupensis". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 16 July 2015. 
  3. ^ a b "Najas guadalupensis in Flora of North America @". Retrieved 2017-01-31. 
  4. ^ Magnus, Paul Wilhelm. 1870. Beitrage zur Kenntniss der Gattung Najas viii. Najas guadalupensis
  5. ^ von,, Linné, Carl; von,, Linné, Carl; Christian,, Dieterich, Johann; Anton,, Sprengel,; Anton,, Sprengel,; Joachim,, Sprengel, Kurt Polycarp; Dieterichianae., Librariae (1825-01-01). "Caroli Linnaei ... Systema vegetabilium /". v.1 (1825). 
  6. ^ Subils, Rosa & Hunziker, Armando Theodoro. 1973.Lorentzia no. 2: 9, fig. 1, Najas arcana
  7. ^ Schmidt, Otto Christian. 1925. Repertorium Specierum Novarum Regni Vegetabilis. Centralblatt für Sammlung und Veroffentlichung von Einzeldiagnosen neuer Pflanzen 22: 99, Najas urbaniana
  8. ^ Kew World Checklist of Selected Plant Families, genus Najas
  9. ^ a b c Haynes, Robert Ralph & Hellquist, C. Baare. 1996. New combinations in North American Alismatidae. Novon 6(4): 370-371

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