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Montana Field Guide

Montana Field Guides

Illinois Pondweed - Potamogeton illinoensis

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Native Species

Global Rank: G5
State Rank: SNR
C-value: 6


Agency Status
USFWS:
USFS:
BLM:


 

External Links

 
General Description
Stems terete, sometimes branched. Submersed leaves short-petiolate; blades linear-lanceolate to oblanceolate, 6–20 cm × 15–35 mm; stipules 2–6 cm long, not sheathing. Floating leaves (often absent) petiolate; blades elliptic, 3–12 cm long. Spikes stout, 2–7 cm long. Tepals green, 2–3 mm long. Fruits 3–4 mm long, keeled with a rounded beak ca. 1 mm long (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Throughout North America (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 116

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Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Habitat
Moderate to deep, fresh water of lakes, sloughs, rivers; valleys (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).


References
  • Literature Cited AboveLegend:   View Online Publication
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p.
  • Web Search Engines for Articles on "Illinois Pondweed"
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Citation for data on this website:
Illinois Pondweed — Potamogeton illinoensis.  Montana Field Guide.  .  Retrieved on , from