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

Alisma gramineum Lej.
narrow-leaved water-plantain (narrowleaf water plantain)
Alismataceae (Water-plantain family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #19661)

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Distribution of Alisma gramineum
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Species Information

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Perennial aquatic herb from a corm-like stem-base and a fibrous root; stems 5-50 cm tall.
All basal, linear, essentially bladeless to long-stalked with narrowly lanceolate blades, from submerged or floating to completely emergent, 3-40 cm long, 0.8-2 cm wide.
Inflorescence an open, bracteate panicle of long-stalked flowers; petals pink or white, slightly longer than the sepals; sepals mostly purple-margined, 2.5-3.5 mm long.
Achenes, 5-20, oblong, about 2 mm wide.
The taxonomy of this species is extremely complex. At present we are recognizing a single taxon. For a discussion of the nomenclatural problems in this species see Reveal (1977).

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
Blooming Period:
Mid Summer
Fruit/Seed characteristics:
Colour: Brown
Present over the Summer
Source:  The USDA

Habitat / Range

Lakeshores, rivers, marshes and tidal flats in the lowland, steppe and montane zones; infrequent in S BC; circumpolar, E to S PQ and S to NY, NM, AZ and N CA; Eurasia.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Alisma gramineum

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) 1174 1174 1174
Slope Gradient (%) 0 0 0
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
7 7 7
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: IDF(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

Alisma geyeri Torr.
Alisma gramineum var. angustissimum (DC.) A.J. Hendricks
Alisma gramineum var. geyeri (Torr.) Lam.
Alisma gramineum var. gramineum
Alisma gramineum var. graminifolium (Wahlenb.) Hendricks
Alisma gramineum var. wahlenbergii auct. non (Holmb.) Raymond & Kucyniak [misapplied]

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References