View source for Potamogeton vaseyi

{{Treatment/ID
|accepted_name=Potamogeton vaseyi
|accepted_authority=J. W. Robbins in A. Gray
|publications={{Treatment/Publication
|title=in A. Gray,Manual of Botany of the Northern United States (ed. 5)
|place=485. 1867
|year=1867
}}
|common_names=Vasey's pondweed;potamot de Vasey
|basionyms=
|synonyms=
|hierarchy=Potamogetonaceae;Potamogeton;Potamogeton vaseyi
|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 vaseyi]]</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 terete, without spots, 2–5 cm; glands absent. <b>Turions</b> common, axillary, 0.5–2 cm × 0.5–1.2 mm, soft; leaves &#177; 2-ranked; outer leaves 2–3 per side, base not corrugate, apex acute; inner leaves undifferentiated or rolled into tight, hardened structure. <b>Leaves</b> submersed, or both submersed and floating, &#177; spirally arranged. <b>Submersed</b> leaves sessile, delicate; stipules persistent, inconspicuous, convolute, free from blade, green to brown, not ligulate, 0.4–1.2 cm, not fibrous, not shredding at tip, apex attenuate; blade light green, linear-filiform, not arcuate, 2–8 cm × 0.1–1 mm, bases slightly tapering, without basal lobes, not clasping, margins entire, not crispate, apex not hoodlike, acute to almost bristle-tipped, lacunae present, rarely absent, 0–2 rows each side of midvein; veins 1(–3). <b>Floating</b> leaves: petioles continuous in color to apex, 5–25 mm; blade adaxially greenish brown, elliptic, spatulate, or obovate, 0.6–1.5 cm × 3–8 mm, base acute, apex obtuse; veins 5–9. <b>Inflorescences</b> unbranched, emersed; peduncles not dimorphic, terminal, ascending in flower, recurved in fruit, cylindric, 5–30 mm; spikes not dimorphic, cylindric or moniliform, 6–8 mm. <b>Fruits</b> sessile, green to brown, obliquely round-obovoid, compressed, abaxially keeled, not laterally keeled, 1.5–2.5 × 1.2–1.6 mm; beak erect, 0.3–0.5 mm; sides without basal tubercles; embryo with 1 full spiral. <b>2n</b> = 28.</span><!--

-->{{Treatment/Body
|phenology=Flowering and fruiting summer–fall.
|habitat=Quiet waters of lakes, ponds, and rivers
|elevation=50–500 m
|distribution=N.B.;Ont.;Que.;Conn.;Ill.;Ind.;Iowa;Maine;Mass.;Mich.;Minn.;N.H.;N.J.;N.Y.;Ohio;Pa.;R.I.;Vt.;Wis.
|discussion=<p>All of the original material of <i>Potamogeton</i> lateralis Morong, including the collection designated as the lectotype, has been studied (C. B. Hellquist et al. 1988). Every specimen, was a mixed collection of <i>P. pusillus</i> and <i>P. vaseyi</i>. Based on the results of the study, P. lateralis is taxonomically nomenclaturally invalid and should be rejected.</p><!--
--><p><i>Potamogeton vaseyi</i> is an uncommon species that has submersed leaves very similar to <i>P. pusillus </i>subsp.<i> gemmiparus</i>. Floating leaves apparently are present only when the species is fertile, and the species often grows intermixed with that subspecies. Collections are consequently often a mixture of the two taxa. Also, sterile collections of either taxon can easily be mistaken for the other.</p>
|tables=
|references={{Treatment/Reference
|id=hellquist1988a
|text=Hellquist, C. B., C. T. Philbrick, and R. L. Hilton. 1988. The taxonomic status of Potamogeton lateralis Morong (Potamogetonaceae). Rhodora 90: 15--20.
}}
}}<!--

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-->{{#Taxon:
name=Potamogeton vaseyi
|author=
|authority=J. W. Robbins in A. Gray
|rank=species
|parent rank=genus
|synonyms=
|basionyms=
|family=Potamogetonaceae
|phenology=Flowering and fruiting summer–fall.
|habitat=Quiet waters of lakes, ponds, and rivers
|elevation=50–500 m
|distribution=N.B.;Ont.;Que.;Conn.;Ill.;Ind.;Iowa;Maine;Mass.;Mich.;Minn.;N.H.;N.J.;N.Y.;Ohio;Pa.;R.I.;Vt.;Wis.
|reference=hellquist1988a
|publication title=in A. Gray,Manual of Botany of the Northern United States (ed. 5)
|publication year=1867
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V22/V22_593.xml
|genus=Potamogeton
|species=Potamogeton vaseyi
}}<!--

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