Page authors: David Giblin, Don Knoke
Stuckenia pectinata
fennel-leaved pondweed, sago pondweed, sago-pondweed

Distribution: Both sides of the Cascades in Washington; common throughout North America; Eurasia

Habitat: Shallow, fresh to brackish water.

Flowers: July-September

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Aquatic, herbaceous perennials from slender rhizomes, the stems filiform, up to 4 dm. long, terete, branching dichotomously for most of their length.


Leaves alternate, submersed, filiform, mostly under 1 mm. broad, up to 12 cm. long, 1-nerved, sharp-pointed; ligules fused to the base of the leaf and forming a sheath 2-3 mm. long, longer than the free upper portion.


Flowers perfect, in spikes 1-3 cm. long in 2-5 unevenly spaced whorls, on a very slender peduncle up to 10 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, 3-3.5 mm. long, with a rounded, dorsal keel and a short, slightly curved beak.

Accepted Name:
Stuckenia pectinata (L.) Borner
Publication: Flora fur das deutsche Volk. 713. 1912. 1912.

Synonyms & Misapplications:
Potamogeton pectinatus L. [HC]
Additional Resources:

PNW Herbaria: Specimen records of Stuckenia pectinata in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Stuckenia pectinata checklist entry.

E-Flora BC: Stuckenia pectinata atlas page.

CalPhotos: Stuckenia pectinata photos.

USDA Plants: Stuckenia pectinata information.

17 photographs:
Group by