E-Flora BC: Electronic Atlas of the Flora of British Columbia

Triglochin maritima L.
seaside arrow-grass (seaside arrowgrass)
Juncaginaceae (Arrow-grass family)

Introduction to Vascular Plants

© Brian Klinkenberg  Email the photographer   (Photo ID #20126)

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Distribution of Triglochin maritima
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Species Information

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Aquatic or semi-aquatic perennial herb from a rhizome; stems (10) 30-100 (120) cm tall.
All basal, tufted, linear, 20-70 cm long, 1.5-2.5 (4) mm wide, flat; ligules entire or nearly so, 1-5 mm long.
Inflorescence elongated and leafless, usually longer than the leaves with many, short-stalked flowers; perianth parts usually 6, about 2 mm long; stamens usually 6; fertile ovaries 6.
Dry, oblong to egg-shaped, 3-5 (7) mm long, splitting into 6 carpels at maturity; seeds 1 per carpel, more or less angled.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Tidal marshes, saline and alkaline ponds, fens and wet meadows in the lowland, steppe and montane zones; frequent throughout BC south of 55degreeN, less frequent northward; cosmopolitan, N to AK, YT and NT, E to NF and S to NH, PA, OH, IL, OK, NM, AZ, CA and MX; Eurasia, N Africa, S America.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Triglochin maritima

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class




Elevation (metres) 0 697 1581
Slope Gradient (%) 0 0 28
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
35 13 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
1 6 8
Modal Nutrient Regime
Number of field plots
 species was recorded in:
Modal BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in: BG(6), BWBS(19), CDF(15), CWH(35), ESSF(1), ICH(12), IDF(47), MS(9), PP(2), SBPS(29), SBS(42), SWB(1)


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Triglochin elata Nutt.
Triglochin elatum Nutt. [orthographic variant]
Triglochin elatum
Triglochin maritima var. elata (Nutt.) A. Gray
Triglochin maritimum L. [orthographic variant]
Triglochin maritimum
Triglochin maritimum var. elatum (Nutt.) A. Gray, orth. var.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References