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Southern Waternymph

Najas guadalupensis (Spreng.) Magnus

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By having unicellular teeth on the leaf margin, Najas guadalupensis resembles N. flexilis and N. graminea. The seeds of N. guadalupensis are pitted; those of N. flexilis are smooth. The sheaths of N. guadalupensis are rounded to slightly auriculate; those of N. graminea are deeply auriculate.
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Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 22 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
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Flora of North America @ eFloras.org
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Flora of North America Editorial Committee
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Description

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Stems often profusely branched distally, 11--90 cm ´ 0.1--2 mm; internodes 0.1--9 cm, without prickles. Leaves spreading with age, 0.3--3.3 cm, lax in age; sheath 1--3.4 mm wide, apex rounded to truncate; blade 0.2--2.1 mm wide, margins minutely serrulate, teeth 18--100 per side, apex rounded to truncateslightly auriculate, with 1--3 teeth, teeth unicellular; midvein without prickles abaxially. Flowers 1--3 per axil, staminate and pistillate on same plants. Staminate flowers in distal axils, 1.5--3 mm; involucral beaks 4-lobed, 0.2--1.3 mm; anther 1- or 4-loculed, 1--1.7 mm. Pistillate flowers in proximal axils, 1.5--4 mm; styles 0.3--1.5 mm; stigmas 4-lobed. Seeds not recurved, yellowish white with purple tinge, fusiform, 1.2--3.8 ´ 0.4--0.8 mm, apex with style situated at center; testa dull, 3 cell layers thick, pitted; aeroleareoles regularly arranged in 20--60 longitudinal rows, not ladderlike, 4--6-angled, longer than broad, end walls not raised. 2n = 12, 36, 42, 48, 54, 60.
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cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 22 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
original
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eFloras

Synonym

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Caulinia guadalupensis Sprengel, Syst. Veg. 1: 20. 1824
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cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 22 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
original
visit source
partner site
eFloras

Najas guadalupensis

provided by wikipedia EN

Najas guadalupensis is a species of aquatic plant known by the common names southern waternymph,[3] 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.[4]

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.[5][6][7] They are also a popular aquarium plant for beginners due to their hardiness as well as growth rate, which helps provide shelter for aquarium fish.[8][9]

Subspecies

Numerous varietal and subspecific names have been proposed. Only four are currently recognized:[2][10]

References

  1. ^ Maiz-Tome, L. (2016). "Najas guadalupensis". IUCN Red List of Threatened Species. 2016: e.T177124A1467909. doi:10.2305/IUCN.UK.2016-1.RLTS.T177124A1467909.en. Retrieved 19 November 2021.
  2. ^ a b The Plant List
  3. ^ USDA, NRCS (n.d.). "Najas guadalupensis". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 16 July 2015.
  4. ^ "Najas guadalupensis in Flora of North America @ efloras.org". www.efloras.org. Retrieved 2017-01-31.
  5. ^ Magnus, Paul Wilhelm. 1870. Beitrage zur Kenntniss der Gattung Najas viii. Najas guadalupensis
  6. ^ 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). {{cite journal}}: Cite journal requires |journal= (help)
  7. ^ Subils, Rosa & Hunziker, Armando Theodoro. 1973.Lorentzia no. 2: 9, fig. 1, Najas arcana
  8. ^ Maerz, John C.; Wilde, Susan B.; Terrell, Vanessa K.; Haram, Brigette; Trimmer, R. Clay; Nunez, Chelsea; Cork, Erin; Pessier, Allan; Lannoo, Sue; Lannoo, Michael J.; Diamond, Sara L. (2018-11-01). "Seasonal and plant specific vulnerability of amphibian tadpoles to the invasion of a novel cyanobacteria". Biological Invasions. 21 (3): 821–831. doi:10.1007/s10530-018-1861-6. ISSN 1387-3547. S2CID 53198641.
  9. ^ "Aquarium Guppy Grass (Najas Guadalupensis) - Benefits And Care". 2020-12-07. Retrieved 2022-04-30.
  10. ^ Kew World Checklist of Selected Plant Families, genus Najas
  11. ^ 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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Najas guadalupensis: Brief Summary

provided by wikipedia EN

Najas guadalupensis is a species of aquatic plant known by the common names southern waternymph, 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.

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. They are also a popular aquarium plant for beginners due to their hardiness as well as growth rate, which helps provide shelter for aquarium fish.

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Wikipedia authors and editors
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