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

Triglochin palustris L.
marsh arrrow-grass
Juncaginaceae (Arrow-grass family)

Introduction to Vascular Plants

© Bryan Kelly-McArthur  Email the photographer   (Photo ID #81248)

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Distribution of Triglochin palustris
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Species Information

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Aquatic perennial herb from a rhizome; stems 15-60 cm tall.
All basal, tufted, linear, 10-30 (40) cm long, 0.5-2 mm wide, flat; ligules usually 2-lobed, 0.5-1.5 mm long.
Inflorescence elongated and leafless, usually longer than the leaves with many, short-stalked flowers; perianth parts usually 6, 1.5-2 mm long; stamens usually 6; fertile ovaries 3.
Dry, linear to slenderly club-shaped, 6-7 (9) mm long, splitting into 3 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, wet meadows and fens in the lowland, steppe and montane zones; common in BC east of the Coast-Cascade Mountains and S of 55degreeN, less frequent northward and along the coast; cosmopolitan, N to AK, YT and NT, E to NF and S to ME, NY, OH, IA, NE, NM, UT, NV and CA; Greenland, Eurasia, S America.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Triglochin palustris

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) 0 863 1581
Slope Gradient (%) 0 1 25
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
30 241 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
3 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: BWBS(13), CWH(2), ICH(4), IDF(10), MS(1), SBPS(3), SBS(9), SWB(2)


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 palustre L. [orthographic variant]

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References