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Chamaecytisus supinus; photograph Karen (with occasional help from Mike), CC BY, iNaturalist via GBIF CC BYKaren (with occasional help from Mike), CC BY, iNaturalist via GBIF

Chamaecytisus supinus (L.) Link

Clustered Broom; Big-flower broom

Fabaceae · Austria, Czechoslovakia +12

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Chamaecytisus supinus, photograph Karen (with occasional help from Mike), CC BY, iNaturalist via GBIFChamaecytisus supinus, photograph Karen (with occasional help from Mike), CC BY, iNaturalist via GBIFChamaecytisus supinus, photograph Zoltán Nagy, CC BY, iNaturalist via GBIFChamaecytisus supinus, photograph Jindřich Soukup, CC0, iNaturalist via GBIFChamaecytisus supinus, photograph Jindřich Soukup, CC0, iNaturalist via GBIFChamaecytisus supinus, photograph Jindřich Soukup, CC0, iNaturalist via GBIF 24 photographs ›
Habitat figures
Cold floor (1 night in 100)
-4.7°C
Record low -14.1 °C in 44 years, at a typical spot in the range NASA POWER
Warmest month, mean daily high
24°C
Jul and Aug at the habitat CHELSA
Rain a year (median across the range)
847mm
12 months of 25 mm or more in the median year CHELSA
Open-sky light
6–37DLI
Lowest to highest month (DLI) CHELSA
The year in your months, northern hemisphere
  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May
  6. Jun
  7. Jul
  8. Aug
  9. Sep
  10. Oct
  11. Nov
  12. Dec
Rain spread: 70% of the median year's rain takes 8 months, so no short rainy season. rain rule, CHELSA
Northern hemisphere unless you set your site. The chart is in the habitat's months.

Summary

Chamaecytisus supinus, also called big-flower broom is a species of flowering plant in the family Fabaceae. It is native to Europe, ranging from Spain to Central and South Europe, going as far as East Thrace in Turkey. It has additionally been introduced to the territories of the Baltic States.

Quoted from Wikipedia, "Chamaecytisus supinus", CC BY-SA 4.0.

Cultivation

Seasons

The rain rule reads no short rainy season: 70% of the median year's rain (594 mm of 846 mm) takes 8 months, October to January and May to August. Mean temperature moves 16.7 °C between the warmest and coldest month. Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: November to February and April to July.

Rain

846 mm in the median year at the habitat, 594 mm of it October to January and May to August. Wettest month October at 83 mm, driest month February at 56 mm. Across the grid cells of the range the year's total runs 683 mm to 1,297 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 847 mm, is the year's rain at the top of the page; the 846 mm here is the median year's, the twelve monthly medians added, which the rain rule reads. Habitat calendar, northern hemisphere; median year across the grid cells of the range, CHELSA.

Light

Open sky over the habitat: 6 to 37 mol/m²/day across the year (daily light integral, median year across the grid cells of the range, CHELSA; the lowest 10th-percentile month across the cells is 5, the highest 90th-percentile month 42).

Warmth and air
Temperature

Coldest: the 1st-percentile night over 44 years at a typical spot in the range is -4.7 °C, the absolute minimum -14.1 °C, 1,724 frost nights in 44 years, 39.2 a year (NASA POWER daily minima). Warmest: the 99th-percentile day is 37.2 °C. Monthly means: the coldest month's mean nightly low 0.2 °C in January (across the grid cells of the range -5.2 °C to 2.1 °C), the warmest month's mean daily high 24.1 °C in July (median year across the grid cells of the range, CHELSA). Cold floor: -4.7 °C, which is the 1st-percentile night over 44 years at a typical spot in the range (NASA POWER).

Humidity

Relative humidity at the habitat: 58 to 67% across the year (monthly means, median year across the grid cells of the range, CHELSA). A figure about the air, saying nothing about how the plant takes water.

How this section is made

Each card states this species' habitat figures with their sources, and what two fixed rules read from them; nothing here says what the plant does, wants or tolerates. The rules · the terms.

Seasons. Read from the median year of CHELSA monthly rainfall and mean temperature across the grid cells of the range: the rain rule takes the smallest set of months carrying 70% of the rain and calls it winter when its mean is more than half a degree below the year's, summer when more than that above, and neither in between; the temperature rule, used only under 120 mm, names the cooler six months when they are at least a degree cooler than the other six. Months are shifted for the other hemisphere only where the temperature curve moves 4 °C or more and the habitat lies 10° or more from the equator. A reading of the curves, not an observation of the plant.

Rain. CHELSA monthly precipitation, median year across the grid cells of the range. The rain that falls where the species is recorded; nothing about how the plant takes water.

Light. CHELSA shortwave radiation at each envelope cell, a daily-mean flux taken to a daily total and converted at 2.07 mol of PAR per MJ. The sky over the habitat, measured; what reaches a plant under a rock, a shrub or a shade cloth is not.

Temperature. NASA POWER daily minima and maxima over 44 years at a typical spot in the range, lapse-corrected -264 m to its elevation; CHELSA monthly means, median year across the grid cells of the range. The cold floor is the 1st-percentile night named in its sentence. Not a measured survival limit for any plant in a pot.

Humidity. CHELSA relative humidity, median year across the grid cells of the range.

Climate across the habitat

Habitat months, northern hemisphere

Habitat climate of Chamaecytisus supinus through the yearWarmest months July and August, mean daily high 24 °C; coldest month January, mean nightly low 0.2 °C; 846 mm of rain in the median year (the twelve monthly medians added). Medians across the range, from CHELSA; the extremes at the edge from NASA POWER. Habitat months, northern hemisphere.-20°-10°0°10°20°30°40°frost37.2° 99th-percentile day, NASA POWER-14.1° lowest night in 44 years, NASA POWER°C · day and nightcold quarter0255075100125150mm rainDLI 6–37RH 58–67%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 817 habitat cells, CHELSA cold quarter: the three months around the coldest month's mean nightly low extremes over 44 years at a typical spot in the range, from NASA POWER, marked at the edge, in no month DLI, mol/m²/dayRH %each on its own scale
Figures by month
JanFebMarAprMayJunJulAugSepOctNovDec
Day °C6 / 2–97 / 3–1011 / 8–1314 / 12–1618 / 16–2022 / 20–2324 / 22–2624 / 22–2620 / 18–2216 / 13–1810 / 7–127 / 3–9
Night °C0 / -5–20 / -5–23 / -1–45 / 2–69 / 7–1012 / 10–1415 / 13–1615 / 13–1612 / 9–138 / 5–104 / 0–61 / -4–3
Rain mm69 / 39–10356 / 35–8062 / 47–9667 / 45–11682 / 66–12671 / 55–11968 / 52–10968 / 51–11667 / 53–12183 / 57–12873 / 53–12280 / 51–111
DLI8 / 6–1213 / 12–1821 / 19–2629 / 28–3334 / 33–3737 / 35–4137 / 34–4232 / 30–3624 / 21–2815 / 13–199 / 7–136 / 5–10
RH %66 / 61–6863 / 60–6561 / 59–6260 / 57–6160 / 58–6159 / 58–6158 / 57–6058 / 57–6161 / 59–6364 / 62–6567 / 62–6967 / 61–70
How this section is made
Each figure is the median across the 817 grid cells holding the 1015 in-range records, with the 10th–90th percentile span across those cells after the slash where it differs. A dash is a month one or more of those cells has no figure for in the grid (a variable CHELSA does not carry there), so no median is taken rather than one over fewer cells. Extremes and elevation were read at a typical spot in the range, cell 905:3699 (44.725, 4.975). Over 44 years there: absolute minimum -14.1 °C, 1st-percentile night -4.7 °C, 99th-percentile day 37.2 °C. Normals: CHELSA V2.1 1981–2010 climatology, 0.05° cells (each the mean of ~36 1 km pixels). Across the range: median and 10th–90th percentile of each month across the 817 distinct grid cells holding 1015 of the 1015 in-range records; extremes and elevation at the typical cell 905:3699 (its coldest month's mean nightly low nearest the median across cells); its position is the cell centre. Extremes: NASA POWER (MERRA-2) daily 1981–2024, cell 44.50_5.000, lapse-corrected -264 m at 6.5 °C/km. Elevation: ETOPO 2022, 202 m (cell mean).

Natural habitat

Native range as published by WCVP; the marker is where the records are densest and decides nothing: the climate was read across the cells of the in-range records placed well enough to read one, not at the marker.
Openly licensed records inside the range, framed on where they fall.
NativeAustria, Czechoslovakia, Germany, Hungary, Poland, Switzerland, France, Spain, Bulgaria, Greece, Italy, Romania, Turkey-in-Europe, Yugoslavia · introduced: Baltic States · regions are the level-3 units of the World Geographical Scheme for Recording Plant Distributions, as Kew's World Checklist records ranges, some under historical names such as Yugoslavia or Czechoslovakia (how).
Map marker47.812, 2.793 · in the densest population, 685 records (54% of those in range)
Kew's description“subshrub or shrub” · “temperate” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 1273 georeferenced records inside the native range; the climate across the range on the 1015 of them placed to within 10 km; the map shows only the 1081 openly licensed ones, which alone would put the marker 1 km away. 4 records outside the WCVP native range not used. 258 in-range records are placed to worse than 10 km, or with no stated accuracy (admitted only as a person's observation to three decimals), and stay on the map but off the climate.
How this section is made
The map marker: the openly licensed record nearest the middle of the densest 1° population inside the densest 2° block of the 1273 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Chamaecytisus supinus, photograph 1did not loadChamaecytisus supinus, photograph 2did not loadChamaecytisus supinus, photograph 3did not loadChamaecytisus supinus, photograph 4did not loadChamaecytisus supinus, photograph 5did not loadChamaecytisus supinus, photograph 6did not load

Photographs: Karen (with occasional help from Mike), CC BY, iNaturalist via GBIF (2); Zoltán Nagy, CC BY, iNaturalist via GBIF; Jindřich Soukup, CC0, iNaturalist via GBIF (3).

Similar habitat climate The 6 nearest by mean daily high, mean nightly low and rain, month by month. How.

Vicia ervilia Vicia ervilia Bitter vetch Photo: CC BY, Marc RieraCyperus fuscus Cyperus fuscus Brown galingale Photo: CC0, author not statedLeersia oryzoides Leersia oryzoides Cut-grass Photo: CC BY, Jason GrantOrnithogalum pyrenaicum Ornithogalum pyrenaicum Spiked star-of-Bethlehem Photo: CC BY, zebedeugalinha Valeriana rimosa Caprifoliaceae Delphinium ajacis Delphinium ajacis Rocket larkspur Photo: CC BY, olmagon

Other Chamaecytisus 15 in the reference

Chamaecytisus albus Chamaecytisus albus Fabaceae Photo: CC BY, Dimitǎr BoevskiChamaecytisus austriacus Chamaecytisus austriacus Fabaceae Photo: CC BY, Dmitriy BochkovChamaecytisus elongatus Chamaecytisus elongatus Fabaceae Photo: CC0, John Kenrick GibsonChamaecytisus eriocarpus Chamaecytisus eriocarpus Fabaceae Photo: CC BY, Salza PalpurinaChamaecytisus hirsutus Chamaecytisus hirsutus Clustered Broom Photo: CC BY, Daniel LinzbauerChamaecytisus leiocarpus Chamaecytisus leiocarpus Fabaceae Photo: CC BY-SA, Michael Wolf (Webseite)Chamaecytisus lindemannii Chamaecytisus lindemannii Fabaceae Photo: CC0, author not stated Chamaecytisus podolicus Fabaceae Chamaecytisus proliferus Chamaecytisus proliferus Fabaceae Photo: CC BY-SA, TigerenteChamaecytisus purpureus Chamaecytisus purpureus Purple Broom Photo: CC BY, Matteo MartiniChamaecytisus pygmaeus Chamaecytisus pygmaeus Fabaceae Photo: CC0, John Kenrick GibsonChamaecytisus ratisbonensis Chamaecytisus ratisbonensis Fabaceae Photo: CC BY, Patrick Hacker all 16 ›

Names & registers

Also known as Cytisus capitatus subsp. supinus; Cytisus hirsutus var. supinus; Cytisus supinus; Genista supina; Tubocytisus supinus and 1 more. (GBIF Backbone)

GBIFPOWOIPNIWFOWikidataWikipedia

The record

Family
Fabaceae
Described by
(L.) Link
Native to
Austria, Czechoslovakia, Germany +11
Wild records
1273 in range · 1081 open

Every figure here is derived from public data by a stated rule and names its source; nothing about this species is written for its page by a person or by AI, apart from the marked, credited quotations. How →

Where this page came from built 2026-10-21
GBIF species record gbif.species answeredasked 2026-10-21
GBIF synonyms gbif.synonyms answeredasked 2026-10-21
GBIF common names gbif.vernacular answeredasked 2026-10-21names fetched 2026-10-21
WCVP native range wcvp.distribution answeredas of 2026-06-04
GBIF occurrence records gbif.occurrences answeredas of 2026-10-21GBIF occurrence download https://doi.org/10.15468/dl.hbdw64, of 2026-10-21; 14 records within 1 km of a botanic garden, herbarium or zoo left out (11 at a botanic garden or arboretum, 3 at a zoo; Wikidata's list)
Habitat climate climate answeredasked 2026-10-21
Daily extremes (NASA POWER) climate.extremes answeredasked 2026-10-21NASA POWER (MERRA-2) daily 1981–2024, cell 44.50_5.000, lapse-corrected -264 m at 6.5 °C/km
Wikidata wikidata answeredasked 2026-10-21
Wikipedia wikipedia answeredasked 2026-10-21
iNaturalist taxon inat.taxon not asked
iNaturalist photographs, wild inat.photos.wild not asked
iNaturalist photographs, cultivated inat.photos.cultivated not asked
GBIF media gbif.media answeredasked 2026-10-21
OpenAlex papers openalex not askednot yet asked for this reference; a later fill takes the papers from OpenAlex's snapshot

Every source is recorded as having answered, reported nothing, refused, failed, not been asked, or answered twice where one answer is taken (“not taken: two items answered”), and, for a source asked when this page was built, when: the figures are as the source held them that day; a source read from a file (Kew's World Checklist, a GBIF download) says "as of" the file's day instead; a row carried from an earlier build of the page names that build instead. Only “nothing to report” is ever shown as an absence. Records came from 156 datasets via GBIF.org; each carries its own licence.

Cultifolio

Opening your plants…