Hesperocodon hederaceus

Plate 1 figs. a–h · 8 separate observations

Hesperocodon hederaceus, photographed by euanmck — fig. b euanmck, CC BY 4.0 / obs. 155946357

Hesperocodon hederaceus, photographed by Anthony O'Leary — fig. c Anthony O'Leary, CC0 1.0 / obs. 152703013

Hesperocodon hederaceus, photographed by John Lyden — fig. d John Lyden, CC BY 4.0 / obs. 148777609

Hesperocodon hederaceus, photographed by Billy Fullwood — fig. e Billy Fullwood, CC BY 4.0 / obs. 144420040

Hesperocodon hederaceus, photographed by Robert H. Wardell — fig. f Robert H. Wardell, CC0 1.0 / obs. 93639060

Hesperocodon hederaceus, photographed by Carminda Santos — fig. h Carminda Santos, CC BY 4.0 / obs. 89582826

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 8 botanical countries

Native distribution of Hesperocodon hederaceus, 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
Belgium	BGM	EUROPE
France	FRA
Germany	GER
Great Britain	GRB
Ireland	IRE
Netherlands	NET
Portugal	POR
Spain	SPA

Not drawn on the map: Great Britain. We hold no public-domain boundary for this region, so it is listed rather than guessed at.

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 162 in flower of 203 examined

11%

61%

96%

100%

88%

Proportion of examined Hesperocodon hederaceus in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	2	too few examined
Feb	0	1	too few examined
Mar	0	5	0%	0% to 43%
Apr	0	11	0%	0% to 26%
May	1	9	11%	2% to 44%
Jun	17	28	61%	42% to 76%
Jul	53	55	96%	88% to 99%
Aug	61	61	100%	94% to 100%
Sep	23	23	100%	86% to 100%
Oct	7	8	88%	53% to 98%
Nov	0	0	too few examined
Dec	0	0	too few examined

Peak flowering in Aug. Each bar is the share of Hesperocodon hederaceus 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. 162 of 203 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 4 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.

Where it actually grows measured, from 685 observations

Condition	5th percentile	Median	95th percentile
Coldest month, mean daily low	-3.5 °C	1.4 °C	6.5 °C
Warmest month, mean daily high	17.5 °C	22.4 °C	27.4 °C
Annual rainfall	782 mm	1,458 mm	2,145 mm
Rainfall in the driest quarter	71 mm	167 mm	321 mm

It is found where winters bring light frost. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 685 research-grade observations of Hesperocodon hederaceus that carry a coordinate, and this is the range those places actually span. The 5th and 95th percentiles are used rather than the minimum and maximum, because a single cultivated specimen in a heated conservatory should not widen a tropical plant's range to the Arctic.

This is not a hardiness zone. A USDA zone is the average annual extreme minimum temperature. The figure above is the mean daily minimum of the coldest month, which is a different quantity and is typically far warmer. Reading one as the other would place a plant several zones too warm, so we do not publish a hardiness zone, because we do not have one. Climate from CHELSA V2.1 (Karger et al. 2017); occurrences from 10.15468/dl.cgje2x.

Also published as 12 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.

Aikinia hederacea (L.) Salisb. ex Fourr.
Campanopsis hederacea (L.) Kuntze
Campanula hederacea L.
Campanula hederifolia Salisb.
Campanula pentagonophylla Vuk.
Cervicina hederacea (L.) Druce
Roucela hederacea (L.) Dumort.
Schultesia hederacea (L.) Roth
Valvinterlobus filiformis Dulac
Wahlenbergia hederacea Rchb.
Wahlenbergia hederifolia Bubani
Wahlenbergia stenocalyx Ingwersen

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.