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

Triodanis perfoliata (L.) Nieuwl.
Venus' Looking-glass (clasping Venus' looking-glass; Dwarf Trillium)
Campanulaceae (Bellflower family)

Introduction to Vascular Plants

© Liz Watkinson  Email the photographer   (Photo ID #21447)

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Distribution of Triodanis perfoliata
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Triodanis perfoliata ssp. perfoliata

Species Information

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Annual herb from a taproot; stems simple or occaásionally few-branched, erect, 10-60 cm tall, spreading short-hairy to bristly-hairy.
Basal leaves lacking; stem leaves alternate, stalkless, heart-shaped or rounded, 0.5-3 cm long, clasping, palmately nerved, lowermost narrower with short stalks.
Inflorescence of false spikes borne in the axils of the middle and upper leaves; corollas deep purple to pale lavender, 8-13 mm long, 5-lobed, lobes longer than the tube.
Capsules, oblong or narrowly egg-shaped, opening above the middle.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry grasslands, rocky slopes, open forests and disturbed areas in the lowland and lower montane zones; infrequent in S BC; E to PQ and S to FL, TX, NM and CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Triodanis perfoliata

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) 770 880 955
Slope Gradient (%) 50 53 58
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
160 185 212
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 2 3
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: ICH(4)


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

Legousia perfoliata (L.) Britton
Specularia perfoliata (L.) A. DC.
Triodanis perfoliata var. perfoliata (L.) Nieuwl. [superfluous autonym]

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References