LONG-LEAF PONDWEED
File Size: 132 KB
 
Potamogeton nodosus  Poir.
Konza Prairie, Riley County, Kansas
Perennial
Height: Aquatic, submersed and/or floating
Family: Potamogetonaceae - Pondweed Family
Flowering Period:   June, July, August, September,October
Stems: To 60 inches, terete, branched.
Leaves: Cauline, alternate or nearly opposite distally, simple, both submersed and floating, or floating absent; parallel-veined, glabrous; petiolate. Submersed leaves with stipules pale brown, conspicuous, 1.2 to 3.5 inch, free from blade; petiole .8 to 5 inches; blade linear-lanceolate to elliptic-lanceolate, 3.5 to 8 inches long, .4 to 1 inch wide, veins 7-15, apex acute. Floating leaves with stipules 1.2 to 4 inches; petiole 1.6 to 8 inches; blade elliptic to oblong-elliptic, 1.2 to 4.4 inches ling, .6 to 1.8 inch wide, veins 9--21, base wedge-shaped to rounded, margins entire, apex acute to rounded.
Inflorescences: Inflorescences spikes, terminal or axillary, emersed, cylindric, .8 to 2.4 inches; peduncles 1.2 to 5.9 inches.
Flowers: Radially symmetric; tepals 4; stamens 4; pistils 1 or 4.
Fruits: Reddish brown, obovoid, .1 to .17 inch, beaked, sides rounded, abaxial keel sharp, lateral ridges low.
Habitat: Usually in shallow water of ponds, lakes, streams, and marshes.
Distribution: Occurs statewide
Origin: Native
Comments: Potamogeton, river + neighbor, alluding to the habitat and nodosus, knotty, alluding to the coarse clusters of fruits.

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