View source for Potamogeton friesii

{{Treatment/ID
|accepted_name=Potamogeton friesii
|accepted_authority=Ruprecht
|publications={{Treatment/Publication
|title=Hist. Stirp. Fl. Petrop.
|place=43. 1845
|year=1845
}}
|common_names=Potamot de Fries
|basionyms=
|synonyms=
|hierarchy=Potamogetonaceae;Potamogeton;Potamogeton friesii
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Potamogetonaceae]]</div><div class="higher-taxon"><small>genus</small>[[Potamogeton]]</div><div class="higher-taxon"><small>species</small>[[Potamogeton friesii]]</div></div>
|volume=Volume 22
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Rhizomes </b>absent. <b>Cauline</b> stems compressed, without spots, 10–135 cm; glands green, greenish brown, or gold, to 0.7 mm diam. <b>Turions</b> terminal or lateral, common, 1.5–5 cm × 1.5–4 mm, soft; leaves &#177; 4-ranked; outer leaves 2–3 per side, base corrugate, apex apiculate to acute; inner leaves reduced, arranged into fan-shaped structure and oriented at 90&#176; angles to outer leaves. <b>Leaves</b> submersed, &#177; spirally arranged, delicate to rigid, sessile; stipules not persistent, inconspicuous, convolute, free from blade, white, not ligulate, 0.55–2.1 cm, fibrous, coarse, shredding at tip, apex obtuse; blade light green, rarely olive-green to.somewhat reddish, linear, not arcuate, 2.3–6.5 cm × 1.2–3.2 mm, base slightly tapering, without basal lobes, not clasping, margins entire, not crispate, apex not hoodlike, acute to apiculate, lacunae absent or 1 narrow row each side of midrib; veins 5–7(–9). <b>Inflorescences</b> unbranched, emersed; peduncles not dimorphic, terminal or axillary, erect or rarely recurved, slightly clavate, 1.2–4.1(–7) cm; spike not dimorphic, cylindric, 7–16 mm. <b>Fruits</b> sessile, olive-green to brown, obovoid, turgid, not abaxially or laterally keeled, 1.8–2.5 × 1.2–2 mm; beak erect, 0.3–0.7 mm; sides without basal tubercles; embryo with 1 full spiral. <b>2n</b> = 26.</span><!--

-->{{Treatment/Body
|phenology=Flowering and fruiting summer–fall.
|habitat=Calcareous to brackish waters of lakes and slow-flowing streams
|elevation=0–3100 m
|distribution=Alta.;B.C.;Man.;N.B.;Nfld. and Labr. (Nfld.);N.W.T.;N.S.;Ont.;P.E.I.;Que.;Sask.;Yukon;Alaska;Colo.;Conn.;Idaho;Ill.;Ind.;Iowa;Maine;Mass.;Mich.;Minn.;Mont.;Nebr.;N.H.;N.Y.;N.Dak.;Ohio;Pa.;R.I.;S.Dak.;Utah;Vt.;Wash.;Wis.;Wyo.;Eurasia.
|discussion=<p>Potamogeton friesii is a fairly common linear-leaved species, especially of calcareous waters of lakes and streams of the upper Midwest. Whenever turions are present, the species is easily identified, as it is the only one with the outer leaves of the turions having corrugate bases and the inner leaves turned at right angles to the outer leaves.</p><!--
--><p>Two hybrids, Potamogeton friesii × P. pusillus (= P. × pusilliformis Fischer [P. × intermedius Fischer]) and P. friesii × P. obtusifolius (= P. × semifructus A. Bennett ex Ascherson & Graebner), have been described.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Potamogeton friesii
|author=
|authority=Ruprecht
|rank=species
|parent rank=genus
|synonyms=
|basionyms=
|family=Potamogetonaceae
|phenology=Flowering and fruiting summer–fall.
|habitat=Calcareous to brackish waters of lakes and slow-flowing streams
|elevation=0–3100 m
|distribution=Alta.;B.C.;Man.;N.B.;Nfld. and Labr. (Nfld.);N.W.T.;N.S.;Ont.;P.E.I.;Que.;Sask.;Yukon;Alaska;Colo.;Conn.;Idaho;Ill.;Ind.;Iowa;Maine;Mass.;Mich.;Minn.;Mont.;Nebr.;N.H.;N.Y.;N.Dak.;Ohio;Pa.;R.I.;S.Dak.;Utah;Vt.;Wash.;Wis.;Wyo.;Eurasia.
|reference=None
|publication title=Hist. Stirp. Fl. Petrop.
|publication year=1845
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V22/V22_262.xml
|genus=Potamogeton
|species=Potamogeton friesii
}}<!--

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