View source for Najas marina

{{Treatment/ID
|accepted_name=Najas marina
|accepted_authority=Linnaeus
|publications={{Treatment/Publication
|title=Sp. Pl.
|place=2: 1015. 1753.
}}
|common_names=Spiny naiad
|special_status={{Treatment/ID/Special_status
|code=F
|label=Illustrated
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Najas gracilis
|authority=(Morong) Small
|rank=species
}}
|hierarchy=Najadaceae;Najas;Najas marina
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Najadaceae]]</div><div class="higher-taxon"><small>genus</small>[[Najas]]</div><div class="higher-taxon"><small>species</small>[[Najas marina]]</div></div>
|volume=Volume 22
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Stems </b>branched distally, 6–45 cm × 0.5–4 mm; internodes 0.3–11 cm, usually with prickles. <b>Leaves</b> spreading to ascending with age, 0.5–3.9 cm, stiff in age; sheaths 2–4.4 mm wide, apex acute; blade 0.4–4.5 mm wide, margins coarsely serrate, teeth 8–13 per side, apex acute, with 1 tooth, teeth multicellular; midvein with prickles abaxially. <b>Flowers</b> 1 per axil, staminate and pistillate on different plants. <b>Staminate</b> flowers in distal to proximal axils, 1.7–3 mm; involucral beaks 2-lobed, 0.3–0.7 mm; anthers 4-loculed, 1.7–3 mm. <b>Pistillate</b> flowers in distal to proximal axils, 2.5–5.7 mm; styles 1.2–1.7 mm; stigmas 3-lobed. <b>Seeds</b> not recurved, reddish brown, ovoid, 2.2–4.5 × 1.2–2.2 mm, apex with style situated at center; testa dull, 10–15 cell layers thick, pitted; areoles irregularly arranged, not in distinctive rows, not ladderlike, 3–4-angled, longer than broad, end walls slightly raised. <b>2n</b> = 12 (Europe).</span><!--

-->{{Treatment/Body
|phenology=Flowering summer–fall.
|habitat=Brackish or highly alkaline waters of ponds and lakes
|elevation=0–1000 m
|distribution=Ariz.;Calif.;Fla.;Ind.;Mich.;Minn.;Nev.;N.Y.;N.Dak.;Ohio;Pa.;S.Dak.;Tex.;Utah;Wis.;Mexico;West Indies;Central America (El Salvador;Panama);South America;Eurasia.
|discussion=<p>With its prickly internodes and prickles along the abaxial surface of the leaves, <i>Najas marina</i> is the easiest of our <i>Najas</i> to recognize. Over its entire range, the species displays considerable morphologic variability (L. Triest et al. 1986), giving cause for ten subspecies to be recognized (L. Triest 1988). In North America, however, variability is relatively minor, so I am recognizing the taxon at the specific level only (R. R. Haynes 1979). The species should be studied over its entire range, utilizing a variety of approaches, to determine adequately what, if any, infraspecific taxa should be recognized.</p>
|tables=
|references={{Treatment/Reference
|id=stuckey1985a
|text=Stuckey, R. L. 1985. Distributional history of Najas marina (spiny naiad) in North America. Bartonia 51: 2--16.
}}{{Treatment/Reference
|id=triest1986a
|text=Triest, L., J. van Geyt, and V. Ranson. 1986. Isozyme polymorphism in several populations of Najas marina L. Aquatic Bot. 24: 373--384.
}}{{Treatment/Reference
|id=viinikka1973a
|text=Viinikka, Y. 1973. The occurrence of B chromosomes and their effect on meiosis in Najas marina. Hereditas (Lund) 75: 207--212.
}}
}}<!--

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-->{{#Taxon:
name=Najas marina
|authority=Linnaeus
|rank=species
|parent rank=genus
|synonyms=Najas gracilis
|basionyms=
|family=Najadaceae
|phenology=Flowering summer–fall.
|habitat=Brackish or highly alkaline waters of ponds and lakes
|elevation=0–1000 m
|distribution=Ariz.;Calif.;Fla.;Ind.;Mich.;Minn.;Nev.;N.Y.;N.Dak.;Ohio;Pa.;S.Dak.;Tex.;Utah;Wis.;Mexico;West Indies;Central America (El Salvador;Panama);South America;Eurasia.
|reference=stuckey1985a;triest1986a;viinikka1973a
|publication title=Sp. Pl.
|publication year=
|special status=Illustrated
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V22/V22_492.xml
|genus=Najas
|species=Najas marina
}}<!--

-->[[Category:Treatment]][[Category:Najas]]