Long-leaf pondweed

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Long-leaf pondweed inflorescences

Long-leaf pondweed

Long-leaf pondweed

Long-leaf pondweed

Long-leaf pondweed

Long-leaf pondweed

Long-leaf pondweed

Long-leaf pondweed

Morphology

Stem

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.

Inflorescence

Inflorescences spikes, terminal or axillary, emersed, cylindric, .8 to 2.4 inches; peduncles 1.2 to 5.9 inches.

Flower

Radially symmetric; tepals 4; stamens 4; pistils 1 or 4.

Fruit

Reddish brown, obovoid, .1 to .17 inch, beaked, sides rounded, abaxial keel sharp, lateral ridges low.

Ecology

Habitat

Usually in shallow water of ponds, lakes, streams, and marshes.

Distribution

Occurs statewide

Additional Notes