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Medicago arborea; photograph (c) Eleftherios Katsillis, some rights reserved (CC BY) CC BY(c) Eleftherios Katsillis, some rights reserved (CC BY) · observed growing wild · 2026-06-27

Medicago arborea L.

Tree medic; Tree medick; Moon trefoil; Alfalfa arborea

Fabaceae · Baleares, Sardegna +7

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Medicago arborea, photograph author not stated, no rights reservedMedicago arborea, photograph author not stated, no rights reservedMedicago arborea, photograph author not stated, no rights reservedMedicago arborea, photograph author not stated, no rights reservedMedicago arborea, photograph author not stated, no rights reservedMedicago arborea, photograph (c) Eleftherios Katsillis, some rights reserved (CC BY) 86 photographs ›
Habitat figures
Cold floor (1 night in 100)
2.9°C
Record low -4.4 °C in 44 years, at a typical spot in the range NASA POWER
Warmest month, mean daily high
27°C
Jul and Aug at the habitat CHELSA
Rain a year (median across the range)
624mm
10 months of 25 mm or more in the median year CHELSA
Open-sky light
12–47DLI
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
Wet winters: the rain comes September to February and April, read as a winter growing season. rain rule, CHELSA
Northern hemisphere unless you set your site. The chart is in the habitat's months.

Summary

Medicago arborea is a flowering plant species in the pea and bean family, Fabaceae. Common names include moon trefoil, shrub medick, alfalfa arborea, and tree medick.

Quoted from Wikipedia, "Medicago arborea", CC BY-SA 4.0.

About the genus · Medicago

Medicago is a genus of flowering plants, commonly known as medick or burclover, in the legume family (Fabaceae). It contains at least 87 species. The genus name is based on the Latin name for that plant, medica, from Greek: μηδική (πόα) Median (grass).

Quoted from Wikipedia, "Medicago", CC BY-SA 4.0.

Cultivation

Seasons

The rain rule reads a winter growing season: 70% of the median year's rain (462 mm of 616 mm) falls in September to February and April, cooler than the year (wet-season mean 13.9 °C against a yearly mean of 16.4 °C). Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: March to August and October.

Rain

616 mm in the median year at the habitat, 462 mm of it September to February and April. Wettest month October at 81 mm, driest month July at 11 mm. Across the grid cells of the range the year's total runs 397 mm to 856 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 624 mm, is the year's rain at the top of the page; the 616 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: 12 to 47 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 10, the highest 90th-percentile month 50).

Warmth and air
Temperature

Coldest: the 1st-percentile night over 44 years at a typical spot in the range is 2.9 °C, the absolute minimum -4.4 °C, 20 frost nights in 44 years (NASA POWER daily minima). Warmest: the 99th-percentile day is 33.8 °C. Monthly means: the coldest month's mean nightly low 6.4 °C in January (across the grid cells of the range 2.8 °C to 11.5 °C), the warmest month's mean daily high 27.2 °C in August (median year across the grid cells of the range, CHELSA). Cold floor: 2.9 °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: 57 to 61% 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 -226 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 Medicago arborea through the yearWarmest months July and August, mean daily high 27 °C; coldest month January, mean nightly low 6.4 °C; 616 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.-10°0°10°20°30°40°frost33.8° 99th-percentile day, NASA POWER-4.4° lowest night in 44 years, NASA POWER°C · day and nightcold quarter0255075100125150mm rainDLI 12–47RH 57–61%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 281 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 °C12 / 10–1412 / 11–1414 / 13–1617 / 15–1920 / 18–2424 / 22–2927 / 24–3227 / 25–3124 / 22–2720 / 19–2316 / 14–1813 / 11–15
Night °C6 / 3–127 / 3–118 / 5–1211 / 8–1414 / 11–1718 / 16–2121 / 18–2322 / 18–2419 / 15–2215 / 12–1911 / 7–158 / 4–13
Rain mm69 / 41–10354 / 37–8149 / 32–6851 / 25–8346 / 12–6525 / 3–4311 / 1–2423 / 1–4456 / 11–8581 / 36–12775 / 56–12476 / 51–125
DLI14 / 12–1720 / 18–2329 / 27–3237 / 34–4042 / 39–4646 / 42–5047 / 43–5041 / 37–4531 / 29–3622 / 19–2615 / 13–1812 / 10–14
RH %60 / 58–6259 / 57–6159 / 57–6159 / 55–6259 / 53–6358 / 50–6357 / 49–6358 / 50–6359 / 53–6261 / 57–6360 / 58–6260 / 58–63
How this section is made
Each figure is the median across the 281 grid cells on land that hold in-range records (552 records in those cells; 26 more cells hold records but no land by the elevation layer, so those records sit at sea and the cells are left out), 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 928:3742 (43.575, 7.125). Over 44 years there: absolute minimum -4.4 °C, 1st-percentile night 2.9 °C, 99th-percentile day 33.8 °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 281 distinct grid cells holding 552 of the 618 in-range records (26 further cells with records at sea, by the elevation layer, left out); extremes and elevation at the typical cell 928:3742 (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 43.50_6.875, lapse-corrected -226 m at 6.5 °C/km. Elevation: ETOPO 2022, 19 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.
NativeBaleares, Sardegna, Spain, Greece, Italy, Kriti, Sicilia, East Aegean Is., Turkey · introduced: Great Britain, France, Portugal, Algeria, Morocco, Tunisia, Canary Is., Cyprus, Palestine, China North-Central, China Southeast, Queensland, Tasmania, New Zealand North, New Zealand South, Chile Central, Uruguay · 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 marker42.461, 3.1 · in the densest population, 410 records (63% of those in range)
Extinct inAlbania · recorded as extinct by WCVP: history, not habitat; no records are tested against these regions
Kew's description“shrub” · “subtropical” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 651 georeferenced records inside the native range; the climate across the range on the 552 of them in the land cells it reads, of 618 placed to within 10 km; the map shows only the 492 openly licensed ones, which alone would put the marker 8 km away. 574 records outside the WCVP native range not used. 33 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 4° block of the 651 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Medicago arborea, photograph 1did not loadMedicago arborea, photograph 2did not loadMedicago arborea, photograph 3did not loadMedicago arborea, photograph 4did not loadMedicago arborea, photograph 5did not loadMedicago arborea, photograph 6did not load

Photographs: author not stated, no rights reserved · CC0 (5); (c) Eleftherios Katsillis, some rights reserved (CC BY).

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

Lotus ornithopodioides Lotus ornithopodioides Southern bird's-foot-trefoil Photo: CC0, author not statedSalicornia fruticosa Salicornia fruticosa Shrubby Glasswort Photo: CC BY, Ana GarciaAsplenium sagittatum Asplenium sagittatum Aspleniaceae Photo: CC0, author not statedAmpelodesmos mauritanicus Ampelodesmos mauritanicus Mauritania vinereed Photo: CC BY, Ana GarciaEchinophora spinosa Echinophora spinosa Prickly Samphire Photo: CC BY, Paolo ZuccaAnthemis maritima Anthemis maritima Asteraceae Photo: CC BY, Filip Żuchowski

Other Medicago 14 in the reference

Medicago arabica Medicago arabica Spotted medick Photo: CC BY, Barry StewartMedicago carstiensis Medicago carstiensis Creeping-rooted medic Photo: CC BY, LjažMedicago ciliaris Medicago ciliaris Fabaceae Photo: CC BY, Eleftherios KatsillisMedicago falcata Medicago falcata Sickle medick Photo: CC BY, Bobo-XMedicago littoralis Medicago littoralis Shore medick Photo: CC BY, Denis BastianelliMedicago lupulina Medicago lupulina Black medick Photo: CC BY, Vasco Henrique Oliveira FonsecaMedicago marina Medicago marina Sea medick Photo: CC BY, Léo SouillardMedicago minima Medicago minima Little bur-clover Photo: CC BY, Orzigul AnvarovaMedicago orbicularis Medicago orbicularis Button medick Photo: CC BY, Marcello ManaraMedicago polymorpha Medicago polymorpha Burclover Photo: CC BY, Vasco Henrique Oliveira FonsecaMedicago sativa Medicago sativa Alfalfa Photo: CC BY, Duarte FradeMedicago scutellata Medicago scutellata Snail medick Photo: CC BY, yelena_antipova all 15 ›

Names & registers

Also known as Medica arborea; Medicago arborea var. citrina; Rhodusia arborea; Trigonella arborea. (GBIF Backbone)

GBIFPOWOIPNIWFOWikidataWikipediaiNaturalist

The record

Family
Fabaceae
Described by
L.
Native to
Baleares, Sardegna, Spain +6
Wild records
651 in range · 492 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 2026-10-22
GBIF species record gbif.species answeredasked 2026-10-22
GBIF synonyms gbif.synonyms answeredasked 2026-10-22
GBIF common names gbif.vernacular answeredasked 2026-10-22names fetched 2026-10-22
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; 94 records within 1 km of a botanic garden, herbarium or zoo left out (72 at a botanic garden or arboretum, 1 at a herbarium, 21 at a zoo; Wikidata's list)
Habitat climate climate answeredasked 2026-10-22
Daily extremes (NASA POWER) climate.extremes answeredasked 2026-10-22NASA POWER (MERRA-2) daily 1981–2024, cell 43.50_6.875, lapse-corrected -226 m at 6.5 °C/km
Wikidata wikidata answeredasked 2026-10-22
Wikipedia wikipedia answeredasked 2026-10-22
iNaturalist photographs, wild inat.photos.wild answeredasked 2026-10-22from iNaturalist's open data of 2026-09-27: research-grade observations with an open-licence photograph, the 24 whose photographs iNaturalist received last (the open data holds no votes); filled 2026-10-22
iNaturalist photographs, cultivated inat.photos.cultivated not asked
GBIF media gbif.media answeredasked 2026-10-22
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 65 datasets via GBIF.org; each carries its own licence.

Cultifolio

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