Page authors: Don Knoke, David Giblin
Zostera marina
common eelgrass, seawrack

Distribution: Occurring in Washington\'s coastal counties; Alaska to California along the coast; also on the Atlantic Coast.

Habitat: Sub-tidal area.

Flowers: June-August

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Monoecious, submersed, aquatic perennials from extensive rhizomes, the stems branching, up to 2 m. long.


Leaves alternate, linear, basally sheathing, up to 12 dm. long and 3-12 mm. broad, the sheaths closed.


Inflorescence 1-sided, 3-6 cm. long, the staminate and pistillate flowers alternating in two rows on the fleshy axis; each staminate flower a single, sessile anther, quickly detached; each pistillate flower a single, 2-carpellary pistil with 1 style and 2 stigmas.

Identification Notes:

:Utricle about 4 mm. long, beaked, rounded at the base.

Accepted Name:
Zostera marina L.
Publication: Sp. Pl. 2: 968. 1753. 1753.

Synonyms & Misapplications:
Zostera marina L. var. stenophylla Asch. & Graebn.
Additional Resources:

PNW Herbaria: Specimen records of Zostera marina in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Zostera marina checklist entry.

E-Flora BC: Zostera marina atlas page.

CalPhotos: Zostera marina photos.

USDA Plants: Zostera marina information.

22 photographs:
Group by