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Montana Field Guide

Montana Field Guides

Longleaf Pondweed - Potamogeton nodosus

Native Species

Global Rank: G5
State Rank: SNR

Agency Status
MNPS Threat Rank:
C-value: 6

External Links

General Description
Stems terete, little branched. Submersed leaves petiolate; blades lanceolate, 10–20 cm × 8–20 mm; stipules 2–12 cm long, not sheathing, deciduous. Floating leaves long-petiolate; blades narrowly elliptic, 5–12 cm long. Spikes stout, 3–6 cm long, continuous. Tepals green, 1–3 mm long. Fruits 3–4 mm long, rounded on back with a short beak (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Circumboreal south through North America to S. America (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 38

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



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


  • Additional ReferencesLegend:   View Online Publication
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    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Peterman, L.G. 1972. The biology and population characteristics of the Arctic grayling in Lake Agnes, Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 29 p.
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Citation for data on this website:
Longleaf Pondweed — Potamogeton nodosus.  Montana Field Guide.  .  Retrieved on , from