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: Circumboreal. Que., N.S., Nfld., Lab. AK, AZ, CA, CO, CT, IA, ID, IL, IN, KS, MA, ME, MI, MN, MO, MT, ND, NE, NH, NJ, NM, NV, NY, OH. OR, PA, RI, SD, VT, WA, WI, WV, WY.

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Greenland; St. Pierre and Miquelon; Alta., B.C., Man., N.B., Nfld. and Labr., N.W.T., N.S., Nunavut, Ont., P.E.I., Que., Sask., Yukon; Alaska, Ariz., Calif., Colo., Conn., Idaho, Ill., Ind., Iowa, Kans., Ky., Maine, Md., Mass., Mich., Minn., Mont., Nebr., Nev., N.H., N.J., N.Y., N.Dak., Ohio, Oreg., Pa., R.I., S.Dak., Utah, Vt., Wash., Wis., Wyo.; Eurasia.
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Distribution: Temperate and arctic regions of Europe, Asia and N. America.
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Physical Description

Morphology

Description

Similar to the previous species but submerged leaves acute or acuminate with minutely or obscurely denticulate margins. Emerged or floating leaves elliptic or ovate-elliptic, petiolate, with cuneate to rounded bases, many veined; submerged leaves sessile, narrowly elliptic or elliptic-oblong to oblanceolate-oblong, translucent, margin minutely denticulate, acute or acuminate, 7-many nerved; stipules conspicuous. Fruitlets 2-3 mm long.
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Description

Rhizomes present. Cauline stems terete to flattened, without spots, to 150 cm; nodal glands absent. Turions absent. Leaves both submersed and floating or submersed only, ± spirally arranged. Submersed leaves sessile or rarely petiolate, lax; stipules persistent, inconspicuous, convolute, free from blade, pale green to brown, not ligulate, 1.3--1.6 cm, not fibrous, not shredding at tip, apex acute to obtuse; petioles to 3 cm; blade light green to brownish green, elliptic, not arcuate, 3.1--9.1 cm ´ 3--27 mm, base attenuate, without basal lobes, not clasping, margins entire, rarely crispate, apex not hoodlike, acuminate, lacunae in 1--2 rows each side of midvein; veins 3--9. Floating leaves: petioles continuous in color to apex, 3--4.5 cm; blade yellow-green to dark green, elliptic to ovate, 3.5--4 cm ´ 16--20 mm, base rounded, apex acuminate; veins 11--13. Inflorescences emersed, unbranched; peduncles not dimorphic, both axillary and terminal, erect to ascending, cylindric, 3.2--7.7 cm; spikes not dimorphic, cylindric, 15--35 mm. Fruits sessile, greenish brown, ovoid, laterally compressed, abaxially and laterally keeled, 1.9--2.3 ´ 1.8--2 mm, lateral keels without points; beak erect, 0.3--0.5 mm; sides without basal tubercles; embryo with less than 1 full spiral. 2n = 52.
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Diagnostic Description

Stem terete or slightly flattened, not black spotted. Many submersed leaves more than 4 mm wide, 3-8 cm long, with 3-9 veins, sessile, not cordate or auriculate at the base. Stipular sheath 1-3 cm long. Beak of the achene less than 1.5 mm long and lacking a basal appendage. Plants not red tinged.

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Synonym

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Ecology

Habitat

Ponds, lakes, streams, and rivers; 0--3500m.
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General Ecology

Extremely variable in size and shape fluctuation may be due to differences in depth and velocity of the waters in which it grows.

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Life History and Behavior

Cyclicity

Flowering/Fruiting

Flowering summer--fall.
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Reproduction

N=26, frequently hybridizes.

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Molecular Biology and Genetics

Molecular Biology

Barcode data: Potamogeton gramineus

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 gramineus

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 8
Specimens with Barcodes: 12
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

Seven hybrids, Potamogeton gramineus ´ P. nodosus (= P. ´ argutulus Hagström), P. gramineus ´ P. richardsonii (= P. hagstroemii A. Bennett [as hagstromii]), P. alpinus ´ P. gramineus (= P. ´ nericius Hagström), P. gramineus ´ P. perfoliatus (= P. ´ nitens Weber [P. ´ subnitens Hagström]), P. gramineus ´ P. natans (= P. ´ sparganiifolius Laestadius ex Fries), P. gramineus ´ P. illinoensis [= P. ´ spathuliformis (J. W. Robbins) Morong)], and P. gramineus ´ P. praelongus (= P. ´ vilnensis Galinis), have been described. 

 Three varieties were recognized (E. C. Ogden 19435) and treated (M. L. Fernald 1950). These varieties, Potamogeton gramineus var. gramineus, deletion}P. gramineus var. myriophyllus, and P. gramineus var. maximus, were said to be separated by the shape and size of the submersed leaves. We have studied many populations of this species in the field and have observed on several occasions that a single population has leaf morphology variable enough to include all three varieties. We have, , therefore , chosen not to recognize any infraspecific categories for this species.

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