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

Lemna trisulca L.
ivy-leaved duckweed (star duckweed)

Introduction to Vascular Plants

© Brian Klinkenberg  Email the photographer   (Photo ID #19632)

E-Flora BC Static Map
Distribution of Lemna trisulca
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Species Information

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Fronds annual, usually submersed, oblong to lanceolate, 6-12 mm long, long-stalked, remaining attached in a zig-zag chain, obscurely 3-nerved, the young plants produced from pouches on either side near the junction of the stalk and the plant body.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
Blooming Period:
Late Spring
Fruit/Seed characteristics:
Colour: Green
Present over the Summer
Source:  The USDA

Habitat / Range

Ponds and slow-moving streams in the lowland, steppe and montane zones; frequent throughout BC south of 56degreeN, absent on the Queen Charlotte Islands and the mainland coast, infrequent elsewhere in BC east of the Coast-Cascade mountains and S of 55degreeN; circumpolar, N to AK, YT and NT, E to NB and NS and S to VA, AL, AR, TX, NM, AZ, CA and MX; Eurasia, S America.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Lemna trisulca

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) 560 1054 1204
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 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(1), IDF(4), SBPS(13)


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.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References