Illinois Natural History Survey - University of Illinois

Potamogeton nodosus
Long leaf pondweed
Taxonomy

Synonyms:

Subspecific taxa:

Classification:

Other taxonomic & nomenclature sources: USDA PlantsITISThe Plant ListIPNI

Images

   
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Species Distribution
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County Map Legend
Absent:
Not known from county
Medium confidence:
Medium or unknown confidence;
often old records or unverifiable observations
Medium-high confidence:
Often observations by expert botanists
High confidence:
Often vouchered herbarium records
Planted / introduced:
Native species introduced outside historic range,
or only in planted locations within county (e.g., restorations)
Historic / extirpated:
Only historic records for the species; likely extirpated
(Note that this category is not yet functional)

North American distribution maps for this species: FLNAUSDA PlantsBONAPBISON

Collection & Observation Phenology [?]

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F
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M
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A
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M
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J
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J
0
A
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S
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O
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N
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D
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Collection & Observation Timeline [?]

Species Status

Status/Listing: No Information

Notes:

Origin: Native

Species Description

General: Monocot, perennial

Roots: adventitious, rhizomes

Shoots: alternate leaf arrangment; simple leaf type; dentate leaf margin; Parallel leaf venation; awl-shaped, linear, oblong leaf shape

Inflorescence: spike

Flowers: perfect; incomplete, not petals, not sepals; hypogynous ovary position

Fruit: achene

Physiology: autotrophic

Ecology & Natural History

Habitat: Species is found floating; in sloughs; avoids colder waters of springs and spring branches.

ILPIN Notes: Plants - at 1' intervals; seeds - broadcast. Seed company no. 11. Species has very elongated and narrower floating leaves than most other Illinois Potamogeton species. Leaves are not arched or folded, submerged leaves with tiny 1-celled teeth. Marshbirds and shorebirds eat seeds as food. Regarding aquatic species cover, this pertains to fish (also foodplant). Regarding aquatic species food value, this refers to aquatic furbearers.

Functional Relationships:

Human Relationships:

  • Edibility [?] : yes
  • Showy Flowers:

Wildlife and Livestock Information:

  • Food Value: waterfowl: good; aquatic species: good
  • Cover Value: fish: good

Coefficient of Conservatism (C-value) [?] :

  • Entire State: 7
  • Chicago Area: 7

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