Overview

Distribution

National Distribution

Canada

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Global Range: Alaska to Newfoundland, south to Washington, Utah, South Dakota, Indiana and Virginia.

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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.
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Physical Description

Morphology

Description

Rhizomes absent. Cauline stems compressed, without spots, 10--135 cm; glands green, greenish brown, or gold, to 0.7 mm diam. Turions terminal or lateral, common, 1.5--5 cm ´ 1.5--4 mm, soft; leaves ± 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° angles to outer leaves. Leaves submersed, ± 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). Inflorescences 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. Fruits 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. 2n = 26.
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Ecology

Habitat

Calcareous to brackish waters of lakes and slow-flowing streams; 0--3100m.
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Life History and Behavior

Cyclicity

Flowering/Fruiting

Flowering and fruiting summer--fall.
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Potamogeton friesii

The following is a representative barcode sequence, the centroid of all available sequences for this species.


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Statistics of barcoding coverage: Potamogeton friesii

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 5
Specimens with Barcodes: 5
Species With Barcodes: 1
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Conservation

Conservation Status

National NatureServe Conservation Status

Canada

Rounded National Status Rank: N5 - Secure

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

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Notes

Comments

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. 

 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.

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