Page authors: Don Knoke, David Giblin
Triglochin maritima
seaside arrow-grass

Distribution: Widely distributed throughout much of Washington; Alaska south to California, east to the Rocky Mountains, then mostly across northern U.S. and southern Canada to the Atlantic Coast.

Habitat: Marsh to moist, gravelly areas, mostly were saline or alkaline.

Flowers: May-August

Origin: Native

Conservation Status: Not of concern


Scapose, herbaceous perennials from woody rhizomes, the scapes 3-12 dm. tall.


Leaves from the rhizome, narrowly linear, the blades flattened, 1.5-2.5 mm. wide, blunt; ligules entire or shallowly lobed, 1.5-4 mm. long.


Flowers perfect, in compact racemes which are over half the length of the plant; pedicles 2-3 mm. long, ascending; perianth segments 6, greenish or purplish, about 2 mm. long; stamens 6, the anthers sessile in the axils of the perianth segments.


Follicles oblong, 5 mm. long, the 6 carpels rounded at the base and with a recurved beak, completely deciduous.

Accepted Name:
Triglochin maritima L.
Publication: Sp. Pl. 1: 339. 1753 (as maritimum). 1753.

Synonyms & Misapplications:
Triglochin elata Nutt.
Triglochin maritimum L. [HC]
Additional Resources:

PNW Herbaria: Specimen records of Triglochin maritima in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Triglochin maritima checklist entry.

E-Flora BC: Triglochin maritima atlas page.

CalPhotos: Triglochin maritima photos.

USDA Plants: Triglochin maritima information.

21 photographs:
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