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Cardamine caldeirarum; photograph author not stated, no rights reserved CC0author not stated, no rights reserved · observed growing wild · 2025-08-24

Cardamine caldeirarum Guthnick ex Seub.

Brassicaceae · Azores

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Cardamine caldeirarum, photograph author not stated, no rights reservedCardamine caldeirarum, photograph author not stated, no rights reservedCardamine caldeirarum, photograph (c) Carminda Santos, some rights reserved (CC BY)Cardamine caldeirarum, photograph (c) Carminda Santos, some rights reserved (CC BY)Cardamine caldeirarum, photograph (c) William Stephens, some rights reserved (CC BY)Cardamine caldeirarum, photograph (c) William Stephens, some rights reserved (CC BY) 24 photographs ›
Habitat figures
Coldest month, mean nightly low
12.4°C
Feb at the habitat, not a floor; extremes not used (sea cell) CHELSA
Warmest month, mean daily high
22°C
Aug at the habitat CHELSA
Rain a year (median across the range)
1,340mm
12 months of 25 mm or more in the median year CHELSA
Open-sky light
11–43DLI
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 March, read as a winter growing season. rain rule, CHELSA
Northern hemisphere unless you set your site. The chart is in the habitat's months.

Cultivation

Seasons

The rain rule reads a winter growing season: 70% of the median year's rain (980 mm of 1,333 mm) falls in September to March, cooler than the year (wet-season mean 15.6 °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 September.

Rain

1,333 mm in the median year at the habitat, 980 mm of it September to March. Wettest month December at 182 mm, driest month July at 39 mm. Across the grid cells of the range the year's total runs 1,125 mm to 1,614 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 1,340 mm, is the year's rain at the top of the page; the 1,333 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: 11 to 43 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 9, the highest 90th-percentile month 44).

Warmth and air
Temperature

Monthly means: the coldest month's mean nightly low 12.4 °C in February (across the grid cells of the range 10.3 °C to 13.7 °C), the warmest month's mean daily high 21.8 °C in August (median year across the grid cells of the range, CHELSA). Cold floor: none read. The nearest figure is 12.4 °C, the coldest month's mean nightly low, February, in the median year (CHELSA); a month's mean of its nightly lows is warmer than the nights a floor is read from. The daily extremes were read at a weather cell that is mostly sea and are not used.

Humidity

Relative humidity at the habitat: 66 to 69% 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. CHELSA monthly means, median year across the grid cells of the range. No cold floor is read without a daily extremes series; the coldest month's mean nightly low named in its sentence is not one. 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 Cardamine caldeirarum through the yearWarmest month August, mean daily high 22 °C; coldest month February, mean nightly low 12.4 °C; 1,333 mm of rain in the median year (the twelve monthly medians added). Medians across the range, from CHELSA. Habitat months, northern hemisphere.5°10°15°20°25°°C · day and nightcold quarter050100150200250mm rainDLI 11–43RH 66–69%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 80 habitat cells, CHELSA cold quarter: the three months around the coldest month's mean nightly low DLI, mol/m²/dayRH %each on its own scale
Figures by month
JanFebMarAprMayJunJulAugSepOctNovDec
Day °C15 / 13–1614 / 13–1614 / 13–1515 / 13–1616 / 14–1718 / 17–2021 / 20–2222 / 21–2321 / 19–2219 / 17–2017 / 15–1816 / 14–17
Night °C13 / 11–1412 / 10–1413 / 11–1413 / 11–1414 / 13–1617 / 15–1819 / 18–2020 / 19–2219 / 18–2117 / 15–1915 / 13–1714 / 12–15
Rain mm125 / 107–183126 / 100–169134 / 106–16495 / 76–11288 / 71–10868 / 52–9639 / 33–6163 / 51–76112 / 93–135147 / 121–175154 / 129–182182 / 150–218
DLI13 / 11–1518 / 16–2126 / 24–2834 / 32–3539 / 38–4141 / 40–4343 / 42–4439 / 38–4030 / 28–3321 / 19–2315 / 12–1711 / 9–14
RH %67 / 62–7166 / 61–7166 / 62–7066 / 62–7167 / 63–7269 / 65–7369 / 65–7368 / 64–7368 / 63–7267 / 62–7166 / 61–7067 / 62–71

The daily extremes were read at a NASA POWER cell that is 32% land: neither it nor the next candidates whose coldest month's mean nightly low is within 2 °C of the median across cells sit in a POWER cell that is mostly land, and the rule reads a cold floor only from a cell that is mostly land, so none is read for this species. Nor is the coldest month's mean nightly low taken as one: it is a mean of a month's lows, not its coldest night. What that cell gave over 44 years: absolute minimum 6.7 °C, 1st-percentile night 9.3 °C, 99th-percentile day 23.0 °C.

How this section is made
Each figure is the median across the 80 grid cells on land that hold in-range records (1652 records in those cells; 2 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 1031:3034 (38.425, -28.275). 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 80 distinct grid cells holding 1652 of the 1654 in-range records (2 further cells with records at sea, by the elevation layer, left out); extremes and elevation at the typical cell 1031:3034 (its coldest month's mean nightly low nearest the median across cells, though its NASA POWER cell is only 32% land and none of the 11 next candidates within 2 °C of the median was mostly land); its position is the cell centre. Extremes: NASA POWER (MERRA-2) daily 1981–2024, cell 38.50_-28.125, lapse-corrected +333 m at 6.5 °C/km. Elevation: ETOPO 2022, 393 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.
NativeAzores · 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 marker38.514, -28.362 · in the densest population, 979 records (58% of those in range)
Kew's description“biennial or perennial” · “temperate” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 1676 georeferenced records inside the native range; the climate across the range on the 1652 of them in the land cells it reads, of 1654 placed to within 10 km; the map shows only the 1605 openly licensed ones, which alone would put the marker in the same place. 38 records outside the WCVP native range not used. 22 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 of the 1676 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Cardamine caldeirarum, photograph 1did not loadCardamine caldeirarum, photograph 2did not loadCardamine caldeirarum, photograph 3did not loadCardamine caldeirarum, photograph 4did not loadCardamine caldeirarum, photograph 5did not loadCardamine caldeirarum, photograph 6did not load

Photographs: author not stated, no rights reserved · CC0 (2); (c) Carminda Santos, some rights reserved (CC BY) (2); (c) William Stephens, some rights reserved (CC BY) (2).

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

Viburnum treleasei Viburnum treleasei Azorean Laurustinus Photo: CC BY, Michael, Antoni and Nihat HinczewskiEuphorbia stygiana Euphorbia stygiana Azores tree spurge Photo: CC BY, Stuart CableAmmi trifoliatum Ammi trifoliatum Trifoliate ammi Photo: CC BY, Carminda SantosHypericum foliosum Hypericum foliosum Hypericaceae Photo: CC BY, Michael, Antoni and Nihat HinczewskiLuzula purpureosplendens Luzula purpureosplendens Azorean Woodrush Photo: CC BY, Michael, Antoni and Nihat HinczewskiVaccinium cylindraceum Vaccinium cylindraceum Azorean Bilberry Photo: CC BY, Michael, Antoni and Nihat Hinczewski

Other Cardamine 37 in the reference

Cardamine amara Cardamine amara Large Bitter-cress Photo: CC BY, Stanislav MurashkinCardamine angustata Cardamine angustata Slender toothwort Photo: CC BY, brettaugustCardamine asarifolia Cardamine asarifolia Asarum-leaved bittercress Photo: CC BY, Flavien SaboureauCardamine bellidifolia Cardamine bellidifolia Alpine bittercress Photo: CC BY, Matt BergerCardamine bipinnata Cardamine bipinnata Brassicaceae Photo: CC BY, Илья РуденкоCardamine bulbifera Cardamine bulbifera Coralroot bittercress Photo: CC BY-SA, C. OppermannCardamine bulbosa Cardamine bulbosa Spring cress Photo: CC BY, Ryan SorrellsCardamine californica Cardamine californica American milkmaids Photo: CC0, author not statedCardamine concatenata Cardamine concatenata Cut-leaved toothwort Photo: CC BY, Alex NovarroCardamine cordifolia Cardamine cordifolia Heart-leaf bittercress Photo: CC BY, Martin PurdyCardamine corymbosa Cardamine corymbosa New Zealand Bitter-cress Photo: CC BY, Colin LeggCardamine diphylla Cardamine diphylla Two-leaved toothwort Photo: CC BY, Loïc Mathieu all 38 ›

Names & registers

Also known as Cardamine caldeirarum var. palmatifida; Cardamine caldeirarum var. parviflora. (GBIF Backbone)

GBIFPOWOIPNIWFOWikidataiNaturalist

The record

Family
Brassicaceae
Described by
Guthnick ex Seub.
Native to
Azores
Wild records
1676 in range · 1605 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; 23 records within 1 km of a botanic garden, herbarium or zoo left out (23 at a botanic garden or arboretum; 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 38.50_-28.125, lapse-corrected +333 m at 6.5 °C/km; read, and set aside: NASA POWER's cell is mostly sea (32% land), so no cold floor is shown
Wikidata wikidata answeredasked 2026-10-21found by its label; its IPNI identifier 280212-1 is Kew's for Cardamine caldeirarum Guthnick ex Seub.
Wikipedia wikipedia nothing to reportasked 2026-10-21
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 2026-10-21none 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
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 14 datasets via GBIF.org; each carries its own licence.

Cultifolio

Opening your plants…