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

Utricularia intermedia Hayne
flat-leaved bladderwort (flatleaf bladderwort)
Lentibulariaceae (Bladderwort family)

Introduction to Vascular Plants

© Bryan Kelly-McArthur  Email the photographer   (Photo ID #65740)

E-Flora BC Static Map
Distribution of Utricularia intermedia
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Species Information

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Perennial aquatic herb without roots; stems very slender, floating, submerged or creeping along the bottom, leafy, up to 50 cm long, 0.4 mm thick.
Alternate, numerous, 0.5-2 cm long, divided into 3 parts at the base and then again 1-3 times into 20 or more thread-like segments, the ultimate ones blunt, usually without bladders but, if present, borne on branches distinct from those bearing the leaves and 2-4 mm wide, leaf margins bristly, the hyaline bristles arising directly from the margins (20x magnification); winter buds 7-16 mm long, bristly.
Inflorescence of 2-4 flowers in lax racemes at the end of stalks 6-20 cm long; corollas yellow, 10-15 mm long, lower lips 8-12 mm long, the spurs parallel to, and over 1/2 the length of the lower lips, the lower lips broad.
Capsules, stalks nearly erect.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Oligotrophic and dystrophic (low nutrient) lakes, fens, and marshes in the lowland, steppe and montane zones; frequent S of 55degreeN in BC, rare northward; circumpolar, N to AK, YT and NT, E to NF and S to OH, DE, IA, and CA; Eurasia.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Utricularia intermedia

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) 80 820 1500
Slope Gradient (%) 0 0 8
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
40 65 90
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
6 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: BWBS(10), CDF(2), CWH(8), ESSF(1), ICH(9), IDF(7), MS(5), SBPS(4), SBS(15)


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

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General References