Triodanis perfoliata(L.) Nieuwl.

clasping Venus's looking glass

WFO wfo-0000819183 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Triodanis perfoliata, photographed by stephen
fig. a stephen, CC BY 4.0 / 2022-06-01 / obs. 202598675
Triodanis perfoliata, photographed by Lynn Harper
fig. b Lynn Harper, CC0 1.0 / obs. 203364580
Triodanis perfoliata, photographed by Clay Gibbons
fig. c Clay Gibbons, CC BY 4.0 / obs. 204497390
Triodanis perfoliata, photographed by Ryan Sorrells
fig. d Ryan Sorrells, CC BY 4.0 / obs. 205634744
Triodanis perfoliata, photographed by mefisher
fig. e mefisher, CC0 1.0 / obs. 203041650
Triodanis perfoliata, photographed by Clay Gibbons
fig. f Clay Gibbons, CC BY 4.0 / obs. 205030735
Triodanis perfoliata, photographed by Mark Apgar
fig. g Mark Apgar, CC BY 4.0 / obs. 205222756
Triodanis perfoliata, photographed by Cole Shoemaker
fig. h Cole Shoemaker, CC BY 4.0 / obs. 203042913

Every figure is a research-grade observation under CC0, CC BY or CC BY-SA, rehosted with the photographer’s name, the licence and the observation it came from. Photographs under a NonCommercial licence are excluded from this site and are never stored, which costs us a great many pictures and is not negotiable.

Flowering n = 2,824 observations

Peak flowering in Jun, from 2,824 community-annotated observations worldwide. This is a global aggregate, not a forecast for your garden: the same species flowers on different dates in different hemispheres, and citizen-science records cluster near cities, at weekends, and in spring. Where a species has fewer than 30 annotated records we do not draw this chart at all.

Also published as 35 synonyms

A synonym is not an error. It is a record of botanists disagreeing, in print, about where this plant belongs. Each of these was somebody’s considered answer.

  • Asyneuma anhuiense B.A.Shen
  • Campanula amplexicaulis Michx.
  • Campanula angulata Raf.
  • Campanula anticensis Kunze ex A.DC.
  • Campanula biflora Ruiz & Pav.
  • Campanula flagellaris Kunth
  • Campanula intermedia Engelm. ex Nutt.
  • Campanula ludoviciana Torr. ex A.Gray
  • Campanula montevidensis Spreng.
  • Campanula perfoliata L.
  • Campanula verticillata Hill
  • Dysmicodon californicus Nutt.
  • Dysmicodon ovatus Nutt.
  • Dysmicodon perfoliatus Nutt.
  • Heterocodon minimus Kellogg
  • Legousia biflora (Ruiz & Pav.) Britton
  • Legousia perfoliata (L.) Britton
  • Lobelia humboldtiana Roem. & Schult.
  • Pentagonia biflora (Ruiz & Pav.) Kuntze
  • Pentagonia perfoliata (L.) Kuntze
  • Prismatocarpus perfoliatus (L.) Sweet
  • Specularia biflora (Ruiz & Pav.) Fisch. & C.A.Mey.
  • Specularia biflora (Ruiz & Pav.) Fisch. & C.A.Mey.
  • Specularia californica (Nutt.) Vatke

and 11 more.

Sourcesevery claim on this page

  1. World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
  2. iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.

We publish what we can source and we say so when we cannot. This page has no care advice, no toxicity claim and no native range, because we do not yet have those from a source we can cite.