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Rheum ribes; photograph (c) Denys Vynokurov, some rights reserved (CC BY) CC BY(c) Denys Vynokurov, some rights reserved (CC BY) · observed growing wild · 2024-05-09

Rheum ribes L.

Syrian rhubarb; Currant-fruited rhubarb; Warty-leaved rhubarb

Polygonaceae · Transcaucasus, Afghanistan +6

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Rheum ribes, photograph (c) Denys Vynokurov, some rights reserved (CC BY)Rheum ribes, photograph (c) Denys Vynokurov, some rights reserved (CC BY)Rheum ribes, photograph (c) Denys Vynokurov, some rights reserved (CC BY)Rheum ribes, photograph (c) Denys Vynokurov, some rights reserved (CC BY)Rheum ribes, photograph (c) Denys Vynokurov, some rights reserved (CC BY)Rheum ribes, photograph (c) Denys Vynokurov, some rights reserved (CC BY) 14 photographs ›
Habitat figures
Cold floor (1 night in 100)
-17.1°C
Record low -27.5 °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)
870mm
9 months of 25 mm or more in the median year CHELSA
Open-sky light
16–50DLI
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 November to April, with nights below freezing; no growing season read. rain rule, CHELSA
Northern hemisphere unless you set your site. The chart is in the habitat's months.

Summary

Rheum ribes, the Syrian rhubarb or currant-fruited rhubarb, or warty-leaved rhubarb, is an edible wild rhubarb species in the genus Rheum. It grows between 1000 and 4000 m on dunite rocks, among stones and slopes, and is now distributed in the temperate and subtropical regions of the world, chiefly in Western Asia (Turkey, Syria, Lebanon, Iran, Azerbaijan, Armenia) to Afghanistan and Pakistan. The Syrian rhubarb is a partially commercial vegetable collected from wild patches in Eastern and Southern Anatolia, Kurdistan, and partly Northwestern Iran in early spring. Rheum ribes is considered as a valuable medicinal species in herbal medicine.

Quoted from Wikipedia, "Rheum ribes", CC BY-SA 4.0.

Cultivation

Seasons

The rain rule reads a rainy season and no growing season: 70% of the median year's rain (615 mm of 796 mm) falls in November to April, the cooler part of the year, but the mean nightly low is below freezing in February, March, April, May, December and January, so the rule reads no growing season from it. Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: May to October.

Rain

796 mm in the median year at the habitat, 615 mm of it November to April. Wettest month March at 131 mm, driest month August at 10 mm. Across the grid cells of the range the year's total runs 447 mm to 1,303 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 870 mm, is the year's rain at the top of the page; the 796 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: 16 to 50 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 13, the highest 90th-percentile month 53).

Warmth and air
Temperature

Coldest: the 1st-percentile night over 44 years at a typical spot in the range is -17.1 °C, the absolute minimum -27.5 °C, 6,779 frost nights in 44 years, 154.1 a year (NASA POWER daily minima). Warmest: the 99th-percentile day is 30.2 °C. Monthly means: the coldest month's mean nightly low -12.1 °C in January (across the grid cells of the range -19.4 °C to -6.3 °C), the warmest month's mean daily high 24.3 °C in July and August (median year across the grid cells of the range, CHELSA). Cold floor: -17.1 °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: 45 to 58% 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 -49 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 Rheum ribes through the yearWarmest months July and August, mean daily high 24 °C; coldest month January, mean nightly low -12.1 °C; 796 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.-40°-20°0°20°40°frost30.2° 99th-percentile day, NASA POWER-27.5° lowest night in 44 years, NASA POWER°C · day and nightcold quarter050100150200250mm rainDLI 16–50RH 45–58%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 31 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 °C-4 / -11–4-3 / -9–52 / -4–109 / 2–1715 / 9–2321 / 14–3024 / 18–3324 / 18–3220 / 14–2713 / 6–205 / -1–12-2 / -7–7
Night °C-12 / -19–-6-11 / -18–-5-7 / -13–-1-1 / -8–53 / -4–108 / 3–1612 / 6–1912 / 6–198 / 2–143 / -4–8-5 / -11–2-10 / -17–-4
Rain mm90 / 39–168103 / 50–189131 / 76–227122 / 62–19667 / 42–14925 / 8–6614 / 4–3010 / 2–2212 / 3–3153 / 16–10779 / 26–14990 / 32–170
DLI19 / 15–2525 / 21–3233 / 30–4040 / 36–4545 / 42–5050 / 47–5350 / 47–5246 / 43–4839 / 35–4228 / 24–3420 / 16–2616 / 13–23
RH %57 / 53–6358 / 54–6357 / 53–6256 / 51–6151 / 46–5946 / 39–5545 / 39–5245 / 38–5045 / 39–5151 / 45–5655 / 50–6156 / 52–63
How this section is made
Each figure is the median across the 31 grid cells holding the 34 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 1079:4625 (36.025, 51.275). Over 44 years there: absolute minimum -27.5 °C, 1st-percentile night -17.1 °C, 99th-percentile day 30.2 °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 31 distinct grid cells holding 34 of the 34 in-range records; extremes and elevation at the typical cell 1079:4625 (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 36.00_51.250, lapse-corrected -49 m at 6.5 °C/km. Elevation: ETOPO 2022, 2380 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.
NativeTranscaucasus, Afghanistan, Iran, Iraq, Lebanon-Syria, Palestine, Turkey, Pakistan · 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 marker36.65, 67.75 · in the densest population, 27 records (44% of those in range)
Kew's description“perennial” · “temperate” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 62 georeferenced records inside the native range; the climate across the range on the 34 of them placed to within 10 km; the map shows only the 15 openly licensed ones, which alone would put the marker 2164 km away. 28 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 centre of the tenth-degree cell nearest the middle (no openly licensed record lies in the population, so no record's coordinates are published) of the densest 1° population inside the densest 4° block of the 62 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Rheum ribes, photograph 1did not loadRheum ribes, photograph 2did not loadRheum ribes, photograph 3did not loadRheum ribes, photograph 4did not loadRheum ribes, photograph 5did not loadRheum ribes, photograph 6did not load

Photographs: (c) Denys Vynokurov, some rights reserved (CC BY) (6).

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

Aethionema speciosum Brassicaceae Tulipa humilis Tulipa humilis Crocus tulip Photo: CC BY, yelena_antipovaCorydalis oppositifolia Corydalis oppositifolia Papaveraceae Photo: CC BY, Averater Silene odontopetala Caryophyllaceae Dionysia tapetodes Dionysia tapetodes Primulaceae Photo: CC BY-SA, Ghislain118…Scilla ingridiae Scilla ingridiae Asparagaceae Photo: CC0, author not stated

Other Rheum 21 in the reference

Rheum acuminatum Rheum acuminatum Himalayan rhubarb Photo: CC BY, Morten RossRheum alexandrae Rheum alexandrae Polygonaceae Photo: CC BY, Wang.QGRheum australe Rheum australe Himalayan rhubarb Photo: CC BY, Sagnik Dutta RoyRheum compactum Rheum compactum Polygonaceae Photo: CC BY, ivansemenkovRheum cordatum Rheum cordatum Polygonaceae Photo: CC BY, Alexander Dubynin Rheum delavayi Polygonaceae Rheum fedtschenkoi Rheum fedtschenkoi Polygonaceae Photo: CC BY-SA, User:BotBln Rheum forrestii Polygonaceae Rheum maximowiczii Rheum maximowiczii Polygonaceae Photo: CC BY, Вячеслав Юсупов Rheum moorcroftianum Polygonaceae Rheum nobile Rheum nobile Sikkim rhubarb Photo: CC0, author not statedRheum officinale Rheum officinale Tibetan rhubarb Photo: CC BY-SA, Kurt Stüber all 22 ›

Names & registers

Also known as Rhabarbarum ribes. (GBIF Backbone)

GBIFPOWOIPNIWFOWikidataWikipediaiNaturalist

The record

Family
Polygonaceae
Described by
L.
Native to
Transcaucasus, Afghanistan, Iran +5
Wild records
62 in range · 15 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; 2 records within 1 km of a botanic garden, herbarium or zoo left out (2 at a botanic garden or arboretum; 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 36.00_51.250, lapse-corrected -49 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 2026-10-22none of the photographs on this page is credited to GBIF: those shown are other sources', and GBIF's were the same photographs or were set aside by the photograph rules
Wikimedia Commons commons 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 11 datasets via GBIF.org; each carries its own licence.

Cultifolio

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