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

Introduction to Vascular Plants


© Brian Klinkenberg     (Photo ID #19632)


E-Flora BC Static Map

Distribution of Lemna trisulca
Click here to view the full interactive map and legend

Species Information

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.

SourceThe Illustrated Flora of British Columbia


If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

USDA Species Characteristics

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


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)
1054 560 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
# 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)

Habitat and 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.

SourceThe Illustrated Flora of British Columbia