Chamaecytisus ratisbonensis

Plate 1 figs. a–h · 8 separate observations

Chamaecytisus ratisbonensis, photographed by Pavel Kacl — fig. b Pavel Kacl, CC BY 4.0 / obs. 193219264

Chamaecytisus ratisbonensis, photographed by Gabriel Mayrhofer — fig. c Gabriel Mayrhofer, CC0 1.0 / obs. 194422952

Chamaecytisus ratisbonensis, photographed by Michael Andresek — fig. f Michael Andresek, CC BY 4.0 / obs. 188501734

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 10 botanical countries

Native distribution of Chamaecytisus ratisbonensis, 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
Belarus	BLR
Bulgaria	BUL
Czechia-Slovakia	CZE
Germany	GER
Hungary	HUN
NW. Balkan Pen.	YUG
Poland	POL
Romania	ROM
Ukraine	UKR

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 202 in flower of 218 examined

77%

94%

95%

Proportion of examined Chamaecytisus ratisbonensis in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	0	too few examined
Feb	0	0	too few examined
Mar	10	13	77%	50% to 92%
Apr	145	154	94%	89% to 97%
May	42	44	95%	85% to 99%
Jun	1	2	too few examined
Jul	0	1	too few examined
Aug	0	0	too few examined
Sep	0	0	too few examined
Oct	0	0	too few examined
Nov	4	4	too few examined
Dec	0	0	too few examined

Peak flowering in May. Each bar is the share of Chamaecytisus ratisbonensis 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. 202 of 218 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.

Where it actually grows measured, from 821 observations

Condition	5th percentile	Median	95th percentile
Coldest month, mean daily low	-5.4 °C	-4.0 °C	-3.3 °C
Warmest month, mean daily high	22.9 °C	24.5 °C	25.9 °C
Annual rainfall	523 mm	642 mm	915 mm
Rainfall in the driest quarter	78 mm	104 mm	161 mm

It is found where winters bring hard 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 821 research-grade observations of Chamaecytisus ratisbonensis 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 46 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.

Aulonix biflorus (L'Hér.) Raf.
Chamaecytisus biflorus (L'Hér.) Link
Chamaecytisus ratisbonensis var. microphyllus (Wimm. & Grab.) Soó
Chamaecytisus ratisbonensis var. pirinicus (Stoj.) Kuzmanov
Cytisus austriacus var. cinereus (Host) Heuff.
Cytisus biflorus L'Hér.
Cytisus biflorus var. calabrus Ten.
Cytisus biflorus var. collinus Neilr.
Cytisus biflorus var. longipedunculatis Sommier & Levier
Cytisus biflorus var. minor W.D.J.Koch
Cytisus capitatus subsp. serotinus (Kit. ex DC.) Jáv.
Cytisus cinereus Host
Cytisus collinus Schur
Cytisus communis Lindem.
Cytisus falcatus DC.
Cytisus hirsutus subsp. ratisbonensis (Schaeff.) Briq.
Cytisus hirsutus var. biflorus (L'Hér.) Briq.
Cytisus hirsutus var. serotinus (Kit. ex DC.) Soó
Cytisus hirsutus var. vulgaris Asch. & Graebn.
Cytisus horniflorus Borbás
Cytisus lithuanicus Gilib.
Cytisus macrospermus Besser ex DC.
Cytisus pilosus Pall.
Cytisus ratisbonensis Schaeff.

and 22 more.

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.