Genista tridentata

Plate 1 figs. a–h · 8 separate observations

Genista tridentata, photographed by Duarte Frade — fig. b Duarte Frade, CC BY 4.0 / obs. 181171522

Genista tridentata, photographed by Vicente Lopes — fig. e Vicente Lopes, CC BY 4.0 / obs. 148341154

Genista tridentata, photographed by Celestino Quintela Sabarís — fig. f Celestino Quintela Sabarís, CC BY 4.0 / obs. 130742816

Genista tridentata, photographed by Daniel Franco — fig. g Daniel Franco, CC BY 4.0 / obs. 124537866

Genista tridentata, photographed by Carminda Santos — fig. h Carminda Santos, CC BY 4.0 / obs. 119334071

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 5 botanical countries

Native distribution of Genista tridentata, 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
Algeria	ALG	AFRICA
Morocco	MOR
Tunisia	TUN
Portugal	POR	EUROPE
Spain	SPA

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 141 in flower of 219 examined

83%

86%

98%

90%

71%

25%

52%

Proportion of examined Genista tridentata in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	10	12	83%	55% to 95%
Feb	6	7	86%	49% to 97%
Mar	45	46	98%	89% to 100%
Apr	43	48	90%	78% to 95%
May	20	28	71%	53% to 85%
Jun	3	12	25%	9% to 53%
Jul	0	9	0%	0% to 30%
Aug	1	23	4%	1% to 21%
Sep	0	5	0%	0% to 43%
Oct	1	4	too few examined
Nov	0	2	too few examined
Dec	12	23	52%	33% to 71%

Peak flowering in Mar. Each bar is the share of Genista tridentata 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. 141 of 219 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 2 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 1,679 observations

Condition	5th percentile	Median	95th percentile
Coldest month, mean daily low	-3.4 °C	1.9 °C	9.1 °C
Warmest month, mean daily high	20.3 °C	25.8 °C	30.9 °C
Annual rainfall	709 mm	1,181 mm	2,074 mm
Rainfall in the driest quarter	20 mm	91 mm	170 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 1,679 research-grade observations of Genista tridentata 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 51 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.

Chamaespartium tridentatum (L.) P.E.Gibbs
Chamaespartium tridentatum subsp. cantabricum (Spach) Rivas Mart., Izco & M.J.Costa
Chamaespartium tridentatum subsp. lasianthum (Spach) Soják
Chamaespartium tridentatum subsp. riphaeum (Pau & Font Quer) Fern.Casas
Chamaespartium tridentatum subsp. stenopterum (Spach) Soják
Cytisus tridentatus (L.) Vuk.
Cytisus tridentatus var. cantabricus (Spach) Briq.
Cytisus tridentatus var. gomaricum Emb. & Maire
Cytisus tridentatus var. lasianthus (Spach) Briq.
Cytisus tridentatus var. rhipheus (Pau & Font Quer) Maire
Cytisus tridentatus var. riphaeus (Pau & Font Quer) Maire
Cytisus tridentatus var. stenopterum (Spach) Briq.
Genista cantabrica Spach
Genista lasiantha Spach
Genista rhiphaea Pau & Font Quer
Genista scolopendria Spach
Genista stenocarpa Janka
Genista stenoptera Spach
Genista tridentata var. cantabrica (Spach) Laguna
Genista tridentata var. lasiantha (Spach) Laguna
Genista tridentata var. stenoptera (Spach) Laguna
Genista undulata Link
Genistella lasiantha (Spach) Holub
Genistella riphaea Pau & Font Quer

and 27 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.