E-Flora BC: Electronic Atlas of the Flora of British Columbia

Potamogeton illinoensis Morong
Illinois pondweed
Potamogetonaceae (Horned pondweed family)

Introduction to Vascular Plants
Once images have been obtained, photographs of this species will be displayed in this window.Click on the image to enter our photo gallery.
Currently no image is available for this taxon.
E-Flora BC Static Map
Distribution of Potamogeton illinoensis
Click here to view the full interactive map and legend
Details about map content are available here
Click on the map dots to view record details.

Species Information

Click on the image below to view an expanded illustration for this species.



General:
Perennial, aquatic herb from strong rhizomes; stems up to 200 cm long, usually branched.
Leaves:
Submersed leaves elliptical to widely lanceolate, thin, flat, intense yellow-green, 8-20 cm long, 2-5 cm wide, with 7 to 19 veins, the tips sharp-pointed, tapering into long stalks at the bases, the stalks less than 2 cm long, the stipules 2.5-8 cm long; floating leaves often absent, if present elliptical, 5-20 cm long, 2-7 cm wide, leathery, long-stalked, the tips pointed, tapering at the bases.
Flowers:
Inflorescence spikelike, the spikes with 8 to 15 whorls of flowers, the stalks thick, inflated.
Fruits:
Achenes, widely egg-shaped or almost globe-shaped, 2.5-3.6 mm long, 2.1-3 mm wide, the beaks widely triangular, the keels wide.
Notes:
Stem anatomical characters Interlacunar bundles strongly developed in 1 circle, often with few additional bundles in neighbouring circles, subepidermal bundles usually absent, pseudohypodermis absent or 1 cell thick, endodermis of U-cells.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Lakes and slowly flowing streams in the steppe zone; infrequent in S BC east of Coast-Cascade Mountains; N to NT, disjunct E from MB to PQ and NS and S to ME, MA, PA, NC, FL, MS, TX, NM, AZ and CA.

Source: The Illustrated Flora of British Columbia

Climate

The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Potamogeton angustifolius Bercht. & C. Presl
Potamogeton heterophyllus Schreb.
Potamogeton lucens auct. non L.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References