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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SUBTAXA PRESENT IN BC
Triodanis perfoliata ssp. perfoliata

Species Information

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General:
Annual herb from a taproot; stems simple or occaásionally few-branched, erect, 10-60 cm tall, spreading short-hairy to bristly-hairy.
Leaves:
Basal leaves lacking; stem leaves alternate, stalkless, heart-shaped or rounded, 0.5-3 cm long, clasping, palmately nerved, lowermost narrower with short stalks.
Flowers:
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.
Fruits:
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

Ecology

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

Minimum

Average

Maximum
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
Class		 C
Number of field plots
 species was recorded in:		 4
Modal BEC Zone Class
 ICH
All BEC Zones (# of stations/zone) species was recorded in: ICH(4)

Climate

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


Genetic information (NCBI Taxonomy Database)
 International Plant Names Index
 Taxonomic Information from the World Flora Online
 Integrated Taxonomic Information System

Additional Photo Sources

UBC Herbarium Scanned Collection Record
 Images From CalPhoto
UT Austin's Native Plant Database
 Google Image Search
 Flickr Image Search

General References

Google Scholar Search
Family References
 General Botanical References for BC
Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2020. E-Flora BC: Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for Advanced Spatial Analysis, Department of Geography, University of British Columbia, Vancouver. [Accessed: 2025-03-28 2:25:46 AM ]
Disclaimer: The information contained in the E-Flora atlas pages is derived from expert sources as cited in each section. This information is scientifically based. E-Flora also acts as a portal to other sites via deep links. As always, users should refer to the original sources for complete information. E-Flora BC is not responsible for the accuracy or completeness of the original information.
© E-Flora BC: An initiative of the Spatial Data Lab, Department of Geography UBC, and the UBC Herbarium.