Campanula rhomboidalis

Plate 1 figs. a–h · 8 separate observations

Campanula rhomboidalis, photographed by Yves Bas — fig. c Yves Bas, CC BY 4.0 / obs. 153447620

Campanula rhomboidalis, photographed by Pieter Huybrechts — fig. d Pieter Huybrechts, CC0 1.0 / obs. 144942065

Campanula rhomboidalis, photographed by Jason Grant — fig. e Jason Grant, CC BY 4.0 / obs. 136776954

Campanula rhomboidalis, photographed by Daniel Cahen — fig. g Daniel Cahen, CC BY 4.0 / obs. 20092763

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.

Native range 4 botanical countries

Native distribution of Campanula rhomboidalis, after Kew’s World Checklist of Vascular Plants. Introduced, extinct and doubtful records are excluded, so this is where the plant is from, not everywhere it now grows.

Region	TDWG code	Continent
Austria	AUT	EUROPE
France	FRA
Italy	ITA
Switzerland	SWI

Region boundaries approximated from Natural Earth (public domain) and mapped to TDWG World Geographical Scheme for Recording Plant Distributions (WGSRPD) level-3 botanical countries (Brummitt 2001). Indicative, not the official WGSRPD geometry.

Flowering 35 in flower of 35 examined

100%

Proportion of examined Campanula rhomboidalis in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	0	too few examined
Feb	0	0	too few examined
Mar	0	0	too few examined
Apr	0	0	too few examined
May	1	1	too few examined
Jun	10	10	100%	72% to 100%
Jul	10	10	100%	72% to 100%
Aug	8	8	100%	68% to 100%
Sep	4	4	too few examined
Oct	1	1	too few examined
Nov	1	1	too few examined
Dec	0	0	too few examined

Peak flowering in Jun. Each bar is the share of Campanula rhomboidalis observations in which someone actually recorded the reproductive state and found the plant in flower, not the raw number of flowering records. That distinction matters: people observe plants far more in spring than in winter, so a bare count of flowering records partly measures when people go outside. Dividing by the number examined removes that. 35 of 35 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 9 months have fewer than 5 examined observations, so no proportion is drawn for them. This is still a global aggregate and not a forecast for your garden: the same species flowers on different dates in different hemispheres. Where a species has fewer than 30 flowering records we do not draw this chart at all. Computed from 10.15468/dl.cgje2x.

Also published as 21 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.

Campanula rhomboidalis f. cordifolia Witasek ex Vacc.
Campanula rhomboidalis f. macrophylla Vacc.
Campanula rhomboidalis f. microphylla Vacc.
Campanula rhomboidalis f. paniculata Vacc.
Campanula rhomboidalis f. reflexa (A.DC.) Voss
Campanula rhomboidalis var. calycina Chabert
Campanula rhomboidalis var. glabrescens Vacc.
Campanula rhomboidalis var. goudetiana P.Beauv.
Campanula rhomboidalis var. hispida St.-Lag.
Campanula rhomboidalis var. pilosa Vacc.
Campanula rhomboidalis var. polypetala A.DC.
Campanula rhomboidalis var. reflexa A.DC.
Campanula rhomboidalis var. songeonii (Chabert) Chabert
Campanula rhomboidalis var. tuberosa Chabert
Campanula rhomboidalis var. uniflora Gaudin
Campanula rhomboidalis var. villosa Wohlf.
Campanula rotundifolia subsp. rhomboidalis (L.) Bonnier
Campanula rotundifolia subsp. rhomboidalis (L.) Bonnier & Layens
Campanula rotundifolia var. songeonii (Chabert) Bonnier
Campanula songeonii Chabert
Campanula venosa Willd.

Sourcesevery claim on this page

World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
Kew, World Checklist of Vascular Plants (WCVP v16). native distribution by TDWG level-3 botanical country, and life form. CC BY 3.0. Retrieved 2026-06-04.

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