View source for Najas flexilis

{{Treatment/ID
|accepted_name=Najas flexilis
|accepted_authority=(Willdenow) Rostkovius & W. L. E. Schmidt
|publications={{Treatment/Publication
|title=Flora Sedinensis
|place=382. 1824
|year=1824
}}
|basionyms={{Treatment/ID/Basionym
|name=Caulinia flexilis
|authority=Willdenow
|rank=species
|publication_title=Mém. Acad. Roy. Sci. Hist. (Berlin)
|publication_place=1798: 89, plate1, fig. 1. 1801
}}
|synonyms={{Treatment/ID/Synonym
|name=Najas caespitosus
|authority=(Maguire) Reveal
|rank=species
}} {{Treatment/ID/Synonym
|name=Najas. canadensis
|authority=Michaux
|rank=species
}}
|hierarchy=Najadaceae;Najas;Najas flexilis
|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 flexilis]]</div></div>
|volume=Volume 22
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Stems </b>often profusely branched distally, 2.5–5 cm × 0.2–0.6 mm; internodes 0.16–6.8 cm, without prickles. <b>Leaves</b> spreading to ascending with age, 0.2–0.6 cm, lax in age; sheath 0.7–1.6 mm wide, apex rounded; blade 0.2–0.6 mm wide, margins minutely serrulate, teeth 35–80 per side, apex acute, with 1–2 teeth, teeth unicellular; midvein without prickles abaxially. <b>Flowers</b> 1(–2) per axil, staminate and pistillate on same plants. <b>Staminate</b> flowers in distal axils, 1.1–2.7 mm; involucral beaks 3-lobed, 0.7–1.2 mm; anther 1-loculed, 1.1–2.7 mm. <b>Pistillate</b> flowers in distal to proximal axils, 2.5–4.7 mm; styles 1.5–1.7 mm; stigmas 3-lobed. <b>Seeds</b> not recurved, deep brown to yellow, narrowly to broadly obovoid, (1.2–)2.5–3.7 × 0.2–1.2 mm, apex with style situated at center; testa glossy, 3 cell layers thick, smooth; aeroleareoles regularly arranged in ca. 50 longitudinal rows, not ladderlike, 3–4-angled, longer than broad, end walls not raised. <b>2n</b> = 12, 24.</span><!--

-->{{Treatment/Body
|phenology=Flowering summer–fall.
|habitat=Lakes and rivers
|elevation=0–1500 m
|distribution=Alta.;B.C.;Man.;N.B.;Nfld. and Labr. (Nfld.);N.S.;Ont.;P.E.I.;Que.;Sask.;Calif.;Conn.;Del.;Idaho;Ill.;Ind.;Iowa;Ky.;Maine;Md.;Mass.;Mich.;Minn.;Mo.;Mont.;N.H.;N.J.;N.Y.;N.Dak.;Ohio;Oreg.;Pa.;R.I.;S.Dak.;Utah;Vt.;Va.;Wash.;W.Va.;Wis.;Eurasia.
|discussion=<p>In habit, <i>Najas flexilis</i> is most similar to <i>N. guadalupensis</i>. When seeds are present, <i>N. flexilis</i> can be separated easily from the latter species by the glossy, smooth, yellowish seeds that are widest above the middle. In the northern United States and in Canada, <i>N. flexilis</i> is by far the most common species of <i>Najas</i>, although in the Ohio and surrounding areas, it is disappearing as eutrophication (depletion of oxygen from lakes) continues (W. A. Wentz and R. L. Stuckey 1971).</p>
|tables=
|references={{Treatment/Reference
|id=posluszny1976a
|text=Posluszny, U. and R. Sattler. 1976. Floral development of Najas flexilis. Canad. J. Bot. 54: 1140--1151.
}}
}}<!--

--><!--

-->{{#Taxon:
name=Najas flexilis
|authority=(Willdenow) Rostkovius & W. L. E. Schmidt
|rank=species
|parent rank=genus
|synonyms=Najas caespitosus;Najas. canadensis
|basionyms=Caulinia flexilis
|family=Najadaceae
|phenology=Flowering summer–fall.
|habitat=Lakes and rivers
|elevation=0–1500 m
|distribution=Alta.;B.C.;Man.;N.B.;Nfld. and Labr. (Nfld.);N.S.;Ont.;P.E.I.;Que.;Sask.;Calif.;Conn.;Del.;Idaho;Ill.;Ind.;Iowa;Ky.;Maine;Md.;Mass.;Mich.;Minn.;Mo.;Mont.;N.H.;N.J.;N.Y.;N.Dak.;Ohio;Oreg.;Pa.;R.I.;S.Dak.;Utah;Vt.;Va.;Wash.;W.Va.;Wis.;Eurasia.
|reference=posluszny1976a
|publication title=Flora Sedinensis
|publication year=1824
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V22/V22_168.xml
|genus=Najas
|species=Najas flexilis
}}<!--

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