Search Field Guide
Advanced Search
Montana Field Guide

Montana Field Guides

Illinois Pondweed - Potamogeton illinoensis


Global Rank: G5
State Rank: SNR

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 6

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 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

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

Summary of Observations Submitted for Montana
Number of Observations: 14

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
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 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
Login Logout
Citation for data on this website:
Illinois Pondweed — Potamogeton illinoensis.  Montana Field Guide.  .  Retrieved on , from