Cytisus arboreus

Plate 1 figs. a–h · 4 observations

This species has been photographed under an open licence only 4 times, so some figures below are different views of the same plant, taken on the same day, rather than different individuals. They are usually different parts of it: the leaf, the flower, the bark.

Cytisus arboreus, photographed by Josep Gesti — fig. a Josep Gesti, CC BY-SA 4.0 / 2022-03-19 / obs. 183712582

Cytisus arboreus, photographed by Katarzyna Żarnowiec — fig. b Katarzyna Żarnowiec, CC BY-SA 4.0 / obs. 182075188

Cytisus arboreus, photographed by Roland Godon — fig. g Roland Godon, CC BY 4.0 / obs. 119145656

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.

The specimen a real sheet, in a real collection

Herbarium: The New York Botanical Garden
Accession: 03996983
Filed as: Cytisus arboreus subsp. baeticus (Webb) Maire
Det. by: not recorded on this sheet
Collected: not recorded
Origin: not recorded
The sheet: View the digitised specimen (CC BY 4.0)

A real pressed plant, in a real collection, under the accession number above. Not an illustration of one. The holding institution does not serve this sheet’s image to third parties, so there is no photograph here. The record is real and the link goes to it. Where we hold no openly licensed sheet for a species this section is simply absent, and where a sheet never recorded who determined it, that field stays empty rather than being filled in. Roughly half of all herbarium sheets never recorded a determiner, which is ordinary.

Native range 5 botanical countries

Native distribution of Cytisus arboreus, 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
France	FRA	EUROPE
Portugal	POR
Spain	SPA
Algeria	ALG	AFRICA
Morocco	MOR

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.

Where it actually grows measured, from 68 observations

Condition	5th percentile	Median	95th percentile
Coldest month, mean daily low	1.6 °C	5.9 °C	8.3 °C
Warmest month, mean daily high	25.2 °C	29.7 °C	34.0 °C
Annual rainfall	515 mm	700 mm	1,316 mm
Rainfall in the driest quarter	17 mm	24 mm	149 mm

It is found where winters are cool but frost is light or absent. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 68 research-grade observations of Cytisus arboreus 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.

Also published as 45 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.

Cytisogenista arborea (Desf.) Rothm.
Cytisogenista baetica (Webb) Rothm.
Cytisogenista catalaunica (Webb) Rothm.
Cytisus arboreus subsp. baeticus (Webb) Maire
Cytisus arboreus subsp. catalaunicus (Webb) Maire
Cytisus arboreus subsp. macranthus (Ball) Maire
Cytisus arboreus subsp. transiens (Maire) Maire
Cytisus arboreus var. ballianus Briq.
Cytisus arboreus var. catalaunicus (Webb) Maire
Cytisus arboreus var. extravagans (Font Quer) Maire
Cytisus arboreus var. haplotrichus Maire
Cytisus arboreus var. intermedius Emb. & Maire
Cytisus arboreus var. leiocarpus Maire
Cytisus arboreus var. leiocladus Maire
Cytisus arboreus var. macranthus (Ball) Jahand. & Maire
Cytisus arboreus var. tetuanensis (Pau & Font Quer) Jahand. & Maire
Cytisus arboreus var. transiens Maire
Cytisus baeticus (Webb) Steud.
Cytisus baeticus f. emarginatus Font Quer
Cytisus baeticus f. melitensis Maire & Sennen
Cytisus baeticus var. africanus (Pau & Font Quer) Sennen & Mauricio
Cytisus baeticus var. extravagans Font Quer
Cytisus baeticus var. macranthus Ball
Cytisus catalaunicus (Webb) Briq.

and 21 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.