Page authors: Don Knoke, David Giblin
Potamogeton praelongus
white-stalked pondweed, whitestem pondweed
Specimens
Photos

Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, Great Plains, Great Lakes region, and eastern North America.

Habitat: Deep water of lakes.

Flowers: May-July

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern

Pollination: Wind

Description:
General:

Aquatic, herbaceous perennials from slender rhizomes, the stems up to 3 m. long, sparingly branched, slightly flattened, 2-3 mm. thick, whitish, the shorter internodes zigzag.

Leaves:

Leaves all submersed, the blades sessile, with a clasping base, oblong-lanceolate, 1-2.5 dm. long and 2-3 cm. broad, entire, the tip rounded and somewhat hooded; stipules free of the blade, 4-10 cm. long, whitish.

Flowers:

Flowers perfect, in dense spikes 2.5-5 cm. long; peduncles club-shaped, 1-3 dm. long; perianth of 4 clawed segments, each with an upturned, oval blade; stamens 4, fused with the claws; pistils 4, sessile.

Fruits:

Achenes obovoid, 4-5 mm. long, with a short beak and prominent dorsal keel.

Accepted Name:
Potamogeton praelongus Wulfen
Publication: Arch. Bot. (Leipzig). 3: 331. 1805.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Potamogeton praelongus in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Potamogeton praelongus checklist entry

OregonFlora: Potamogeton praelongus information

E-Flora BC: Potamogeton praelongus atlas page

CalPhotos: Potamogeton praelongus photos

8 photographs:
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