View source for Potamogeton pusillus subsp. tenuissimus

{{Treatment/ID
|accepted_name=Potamogeton pusillus subsp. tenuissimus
|accepted_authority=(Mertens & W. D. J. Koch) R. R. Haynes & Hellquist
|publications={{Treatment/Publication
|title=Novon
|place=6: 370. 1996
|year=1996
}}
|common_names=Potamot très ténu
|basionyms={{Treatment/ID/Basionym
|name=Potamogeton pusillus var. tenuissimus
|authority=Mertens & W. D. J. Koch
|rank=variety
|publication_title=in J. C. Röhling, Deutschl. Fl. ed.
|publication_place=3, 1: 857. 1823
}}
|synonyms={{Treatment/ID/Synonym
|name=Potamogeton berchtoldii
|authority=Fieber
|rank=species
}} {{Treatment/ID/Synonym
|name=Potamogeton berchtoldii var. colpophilus
|authority=(Fernald) Fernald
|rank=variety
}} {{Treatment/ID/Synonym
|name=Potamogeton berchtoldii var. lacunatus
|authority=(Hagström) Fernald
|rank=variety
}} {{Treatment/ID/Synonym
|name=Potamogeton berchtoldii var. polyphyllus
|authority=(Morong) Fernald
|rank=variety
}} {{Treatment/ID/Synonym
|name=Potamogeton berchtoldii var. tenuissimus
|authority=(Mertens & W. D. J. Koch) Fernald
|rank=variety
}}
|hierarchy=Potamogetonaceae;Potamogeton;Potamogeton pusillus;Potamogeton pusillus subsp. tenuissimus
|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 pusillus]]</div><div class="higher-taxon"><small>subspecies</small>[[Potamogeton pusillus subsp. tenuissimus]]</div></div>
|volume=Volume 22
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Leaves:</b> stipules convolute; blade 0.9–5.4 cm × 0.2–2.5 mm; apex acute to obtuse, lacunae in 1–5 rows each side of midrib; veins 1–3(–5). <b>Inflorescences</b>: peduncles more than 3 per plant, cylindric to slightly clavate; spikes capitate to cylindric, continuous. <b>Fruits</b> ovoid, sides rounded, rarely concave; beak median, rarely toward adaxial edge. <b>2n</b> = 26.</span><!--

-->{{Treatment/Body
|phenology=Flowering and fruiting summer–fall.
|habitat=Shallow waters of lakes and streams
|elevation=0–2100 m
|distribution=Alta.;B.C.;Man.;N.B.;Nfld. and Labr.;N.W.T.;N.S.;Nunavut;Ont.;P.E.I.;Que.;Sask.;Yukon;Ala.;Alaska;Ariz.;Ark.;Calif.;Colo.;Conn.;Del.;D.C.;Fla.;Ga.;Idaho;Ill.;Ind.;Iowa;Ky.;La.;Maine;Md.;Mass.;Mich.;Minn.;Miss.;Mont.;Nev.;N.H.;N.J.;N.Y.;N.C.;N.Dak.;Ohio;Okla.;Oreg.;Pa.;R.I.;S.C.;Vt.;Va.;Wash.;Wis.;Wyo.;Eurasia.
|discussion=<p>Although Delaware and West Virginia lies within the mapped area, we know of no collections from that state.</p><!--
--><p><i>Potamogeton pusillus </i>subsp.<i> tenuissimus</i> is the most common linear-leaved subspecies of the family in temperate North America. Whenever one finds a linear-leaved pondweed with 1–5 rows of lacunae on each side of the midvein, chances are that it is <i></i>subsp.<i> tenuissimus</i>.</p><!--
--><p>Only <i>Potamogeton obtusifolius</i> could be confused with the taxon, and it can be separated by having its cylindric inflorescence, whereas <i></i>subsp.<i> tenuissimus</i> has a capitate inflorescence.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Potamogeton pusillus subsp. tenuissimus
|authority=(Mertens & W. D. J. Koch) R. R. Haynes & Hellquist
|rank=subspecies
|parent rank=species
|synonyms=Potamogeton berchtoldii;Potamogeton berchtoldii var. colpophilus;Potamogeton berchtoldii var. lacunatus;Potamogeton berchtoldii var. polyphyllus;Potamogeton berchtoldii var. tenuissimus
|basionyms=Potamogeton pusillus var. tenuissimus
|family=Potamogetonaceae
|phenology=Flowering and fruiting summer–fall.
|habitat=Shallow waters of lakes and streams
|elevation=0–2100 m
|distribution=Alta.;B.C.;Man.;N.B.;Nfld. and Labr.;N.W.T.;N.S.;Nunavut;Ont.;P.E.I.;Que.;Sask.;Yukon;Ala.;Alaska;Ariz.;Ark.;Calif.;Colo.;Conn.;Del.;D.C.;Fla.;Ga.;Idaho;Ill.;Ind.;Iowa;Ky.;La.;Maine;Md.;Mass.;Mich.;Minn.;Miss.;Mont.;Nev.;N.H.;N.J.;N.Y.;N.C.;N.Dak.;Ohio;Okla.;Oreg.;Pa.;R.I.;S.C.;Vt.;Va.;Wash.;Wis.;Wyo.;Eurasia.
|reference=None
|publication title=Novon
|publication year=1996
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V22/V22_485.xml
|genus=Potamogeton
|species=Potamogeton pusillus
|subspecies=Potamogeton pusillus subsp. tenuissimus
}}<!--

-->[[Category:Treatment]][[Category:Potamogeton pusillus]]