Potamogeton nodosus . Poir
Longleaf pondweed
Life   Plantae   Monocotyledoneae   Potamogetonaceae   Potamogeton

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Potamogeton nodosus, plant
© George Yatskievych, 2003 · 1
Potamogeton nodosus, plant

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Following modified from Delaware Wildflowers
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Delaware Wildflowers  •  Scientific names

Potamogeton nodosus Poir. ( Potamogeton americanus ) Longleaf Pondweed
Potamogetonaceae — Pondweed family
Potamogeton nodosus
Brandywine Park
September 2005

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Copyright David G. Smith

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https://plants.usda.gov/java/profile?symbol=PONO2 ---> http://plants.usda.gov/core/profile?symbol=PONO2
http://plants.usda.gov/core/profile?symbol=PONO2 ---> https://plants.usda.gov/core/profile?symbol=PONO2
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Potamogeton nodosus Poir.
longleaf pondweed

Image of Potamogeton nodosus

General Information
Symbol: PONO2
Group: Monocot
Family: Potamogetonaceae
Duration: Perennial
Growth Habit : Forb/herb
Native Status : CAN   N
HI   N
L48   N
PR   N
Data Source and Documentation
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Plants-NRCS Logos
green round image for nativity Native blue round image for introduced Introduced ocre round image for introduced and nativity Both white round image for no status Absent/Unreported
image for native, but no county data Native, No County Data image for introduced, but no county data Introduced, No County Data both introduced and native, but no county data Both, No County Data
Native Status:
lower 48 status L48    Alaska status AK    Hawaii status HI    Puerto Rico status PR    Virgin Islands status VI    Navassa Island NAV    Canada status CAN    Greenland status GL    Saint Pierre and Michelon status SPM    North America NA   


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Robert H. Mohlenbrock. USDA NRCS. 1992. Western wetland flora: Field office guide to plant species . West Region, Sacramento. Provided by USDA NRCS Wetland Science Institute (WSI). Usage Requirements .

Robert H. Mohlenbrock. USDA NRCS. 1992. Western wetland flora: Field office guide to plant species . West Region, Sacramento. Provided by USDA NRCS Wetland Science Institute (WSI). Usage Requirements .

Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 1: 77. Provided by Kentucky Native Plant Society . Scanned by Omnitek Inc . Usage Requirements .



Symbol Scientific Name
POAM11 Potamogeton americanus Cham. & Schltdl.
POFL9 Potamogeton fluitans Roth
POOB9 Potamogeton oblongifolius J.R. Forst., nom. utique rej.


Click on a scientific name below to expand it in the PLANTS Classification Report.
Rank Scientific Name and Common Name
Kingdom Plantae – Plants
Subkingdom Tracheobionta – Vascular plants
Superdivision Spermatophyta – Seed plants
Division Magnoliophyta – Flowering plants
Class Liliopsida – Monocotyledons
Subclass Alismatidae
Order Najadales
Family Potamogetonaceae – Pondweed family
Genus Potamogeton L. – pondweed
Species Potamogeton nodosus Poir. – longleaf pondweed

Subordinate Taxa

This plant has no children

Legal Status

Wetland Status

Interpreting Wetland Status

Top Level Regions
Caribbean OBL
Hawaii OBL
North America
Arid West OBL
Atlantic and Gulf Coastal Plain OBL
Eastern Mountains and Piedmont OBL
Great Plains OBL
Midwest OBL
Northcentral & Northeast OBL
Western Mountains, Valleys, and Coast OBL

Related Links

More Accounts and Images
ARS Germplasm Resources Information Network (PONO2)
CalPhotos (PONO2)
Flora of North America (PONO2)
Integrated Taxonomic Information System (POAM11)
Integrated Taxonomic Information System (POFL9)
Integrated Taxonomic Information System (PONO2)
Jepson Interchange (University of California - Berkeley) (PONO2)
Lady Bird Johnson Wildflower Center Native Plant Information Network (PONO2)
USF Atlas of Florida Vascular Plants (PONO2)
University of Tennessee Herbarium (Distribution) (PONO2)
University of Wisconsin - Stevens Point Freckmann Herbarium (PONO2)



Source Large Mammals Small Mammals Water Birds Terrestrial Birds


Source Large Mammals Small Mammals Water Birds Terrestrial Birds

Description of Values

Value Class Food Cover

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27. Potamogeton nodosus Poiret in J. Lamarck et al., Encyclopedie Methodique. Botanique ... Supplement. 4(2): 5354. 1816.

Long-leaf pondweed, potamot noeuex

Rhizomes present. Cauline stems terete, without spots, to 100 cm; nodal glands absent. Turions absent. Leaves both submersed and floating, or floating absent, ± spirally arranged. Submersed leaves petiolate, lax; stipules persistent to deliquescent, conspicuous, convolute, free from blade, light brown, not ligulate, 3--9 cm, not fibrous, not shredding at tip, apex round to acute; petioles 2--13 cm; blade light to dark green, linear-lanceolate to lance-elliptic, not arcuate, 9--20 cm ´ 10--35 mm, base acute, without basal lobes, not clasping, margins entire, not crispate, apex not hoodlike, acute, without sharp awl-like tip, lacunae in 2--5 rows each side of midrib; veins 7--15. Floating leaves: petioles 3.5--26 cm; blade adaxially light green, lenticular to elliptic, 3--11 cm ´ 15--45 mm, base cuneate to rounded, apex acute to rounded; veins 9--21. Inflorescences unbranched, emersed; peduncles not dimorphic, terminal, erect to ascending, cylindric, 3--15 cm; spikes not dimorphic, cylindric, 20--70 mm. Fruits sessile, red to reddish brown, obovoid, abaxially keeled, laterally ridged, 2.7--4.3 ´ 2.5--3 mm, keel well developed, lateral ridges with blunt to sharp tips; beak erect; sides without basal tubercles; embryo with 1 full spiral. 2n = 52.

Flowering summer--fall. Clear to turbid waters of lakes, streams, rivers, and sloughs; 0--3300 m; Alta., B.C., N.B., Ont., Que., Sask.; Ala., Ariz., Ark., Calif., Colo., Conn., Del., D.C., Fla., Ga., Idaho, Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., Mont., Nebr., Nev., N.H., N.J., N.Mex., N.Y., N.C., N.Dak., Ohio, Okla., Oreg., Pa., R.I., S.C., S.Dak., Tenn., Tex., Utah, Vt., Va., Wash., W.Va., Wis., Wyo.; Mexico; West Indies; Central America; South America; Eurasia.

Six hybrids, Potamogeton gramineus ´ P. nodosus (= P. ´ argutulus Hagström), P. illinoensis ´ P. nodosus (= P. ´ faxonii Morong), P. nodosus ´ P. richardsonii (= P. ´ rectifolius A. Bennett), P. natans ´ P. nodosus (= P. ´ schreberi Fischer [P. ´ perplexus A. Bennett]), P. alpinus ´ P. nodosus (= P. ´ subotusus Hagström), and P. epihydrus ´ P. nodosus (= P. ´ subsessilis Hagström), have been described.

Potamogeton nodosus is a common floating-leaved species throughout much of the United States and southern Canada. When both submersed and floating leaves are present, it is very easily recognized by the petioles of the submersed leaves being longer than 5 cm.

Following modified from CalPhotos
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http://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Potamogeton+nodosus&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant ---> https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Potamogeton+nodosus&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant

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Number of matches : 6
Query: SELECT * FROM img WHERE ready=1 and taxon like "Potamogeton nodosus%" and (lifeform != "specimen_tag" OR lifeform != "Plant") ORDER BY taxon

Click on the thumbnail to see an enlargement

Potamogeton nodosus
Potamogeton nodosus
Long-leaved Pondweed
ID: 6246 3041 2861 0079 [detail]
© 1995 Saint Mary's College of California

Potamogeton nodosus
Potamogeton nodosus
Long-leaved Pondweed
ID: 0000 0000 1207 0345 [detail]
© 2007 Neal Kramer

Potamogeton nodosus
Potamogeton nodosus
Long-leaved Pondweed
ID: 0000 0000 1207 0312 [detail]
© 2007 Neal Kramer

Potamogeton nodosus
Potamogeton nodosus
Long-leaved Pondweed
ID: 0000 0000 1207 0310 [detail]
© 2007 Neal Kramer

Potamogeton nodosus
Potamogeton nodosus
Long-leaved Pondweed
ID: 0000 0000 1207 0311 [detail]
© 2007 Neal Kramer

Potamogeton nodosus
Potamogeton nodosus
ID: 0000 0000 0113 2344 [detail]
© 2013 Jake Ruygt

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