Page author: Don Knoke
Potamogeton foliosus
leafy pondweed

Distribution: British Columbia to Newfoundland, south on both sides of the Cascades to Mexico.

Habitat: Standing to moving, shallow water.

Flowers: Late June - August

Origin: Native

Conservation Status: Not of concern


Aquatic, herbaceous perennials from slender rhizomes, the stems freely branching, somewhat compressed and narrow winged, scarcely 1 mm. broad, up to 10 dm. long.


Leaves all submersed, without basal glands, narrowly linear, 1-1.5 mm. broad and up to 10 cm. long, acute, 3-nerved, bordered toward the base with air chambers; stipules united and surrounding the stem, 5-15 mm. long, ultimately disintegrating.


Inflorescence of spikes up to 5 mm. long with 2-3 whorls of crowded, sessile flowers; peduncles stout, rarely over 2 cm. long; perianth of 4 clawed segments, each with an upturned, oval blade; stamens 4, fused with the claws; pistils 4, sessile.


Achenes obliquely obovoid, 2 mm. long, with a prominent dorsal keel.

Accepted Name:
Potamogeton foliosus Raf.
Publication: Medical Repository. hexade 2, 5:354. 1808.

Synonyms & Misapplications:
Potamogeton curtissii Morong
Potamogeton foliosus Raf. ssp. foliosus [FNA22]
Potamogeton foliosus Raf. var. foliosus [HC, JPM]
Potamogeton foliosus Raf. var. macellus Fernald [HC]
Additional Resources:

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

WA Flora Checklist: Potamogeton foliosus checklist entry.

E-Flora BC: Potamogeton foliosus atlas page.

CalPhotos: Potamogeton foliosus photos.

USDA Plants: Potamogeton foliosus information.

17 photographs:
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