Difference between revisions of "Potamogeton ogdenii"
Systematic Botany 8: 88, figs. 1–3, plates 1–2, figs. 1–3. 1983.
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|common_names=Ogden's pondweed;potamot d’Ogden | |common_names=Ogden's pondweed;potamot d’Ogden | ||
| + | |special_status={{Treatment/ID/Special_status | ||
| + | |code=E | ||
| + | |label=Endemic | ||
| + | }}{{Treatment/ID/Special_status | ||
| + | |code=C | ||
| + | |label=Conservation concern | ||
| + | }} | ||
|basionyms= | |basionyms= | ||
|synonyms= | |synonyms= | ||
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|elevation=100–300 m | |elevation=100–300 m | ||
|distribution=Ont.;Conn.;Mass.;N.Y.;Vt. | |distribution=Ont.;Conn.;Mass.;N.Y.;Vt. | ||
| − | |discussion=<p>Potamogeton ogdenii is an extremely local species, probably known from fewer than a dozen localities. The species is herein reported for the first time from Canada, being known from that country by a single collection made in 1987.</p><!-- | + | |discussion=<p><i>Potamogeton ogdenii</i> is an extremely local species, probably known from fewer than a dozen localities. The species is herein reported for the first time from Canada, being known from that country by a single collection made in 1987.</p><!-- |
--><p>Of conservation concern.</p> | --><p>Of conservation concern.</p> | ||
|tables= | |tables= | ||
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-->{{#Taxon: | -->{{#Taxon: | ||
name=Potamogeton ogdenii | name=Potamogeton ogdenii | ||
| − | |||
|authority=Hellquist & R. L. Hilton | |authority=Hellquist & R. L. Hilton | ||
|rank=species | |rank=species | ||
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|publication title=Systematic Botany | |publication title=Systematic Botany | ||
|publication year=1983 | |publication year=1983 | ||
| − | |special status= | + | |special status=Endemic;Conservation concern |
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V22/V22_57.xml |
|genus=Potamogeton | |genus=Potamogeton | ||
|species=Potamogeton ogdenii | |species=Potamogeton ogdenii | ||
Latest revision as of 20:32, 5 November 2020
Rhizomes absent. Cauline stems compressed-filiform, without spots, to 50 cm; glands green, golden brown to dark brown, 0.2–0.6 mm diam. Turions terminal or lateral, uncommon, 3.7–9.9 × 2.6–6 cm, soft to hard; leaves flattened with outer and inner leaves in same plane; outer leaves 1–2 per side, base not corrugate, apex apiculate; inner leaves undifferentiated or rolled into hardened, fusiform structure. Leaves submersed, ± spirally arranged, sessile, rigid; stipules persistent, inconspicuous, convolute, free from blade, brown or rarely white, not ligulate, 0.9–2.1 cm, slightly fibrous, partially shredding at tip, apex obtuse; blade somewhat reddish to olive-green, linear, not arcuate, 1.5–10 cm × 1.2–2.9 mm, base slightly tapering, without basal lobes, not clasping, margins entire, not crispate, apex not hoodlike, cuspidate to bristle-tipped, lacunae present or absent, in 0–3 rows each side of midvein; veins 3–9(–13). Inflorescences unbranched, emersed; peduncles not dimorphic, terminal or occasionally axillary, erect or rarely recurved, slightly clavate, 1–3 cm; spikes not dimorphic, cylindric, 5–11 mm. Fruits sessile, dark green, orbicular, turgid, abaxial keel obscure, lateral keels obscure or absent, 2.5–3 × 2.2–3 mm, lateral keels if present without points; beak erect, 0.5 mm; sides without basal tubercles; embryo with 1 full spiral. Chromosome number unknownnot available.
Phenology: Flowering mid summer–fall.
Habitat: Alkaline waters of ponds and lakes
Elevation: 100–300 m
Distribution
Ont., Conn., Mass., N.Y., Vt.
Discussion
Potamogeton ogdenii is an extremely local species, probably known from fewer than a dozen localities. The species is herein reported for the first time from Canada, being known from that country by a single collection made in 1987.
Of conservation concern.
Selected References
None.