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Cochemiea poselgeri; photograph Alexis López Hernández, CC BY, iNaturalist via GBIF CC BYAlexis López Hernández, CC BY, iNaturalist via GBIF

Cochemiea poselgeri (Hildm.) Britton & Rose

Cactaceae · Mexico Northwest · listed by its family as a cactus or succulent

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Cochemiea poselgeri, photograph Alexis López Hernández, CC BY, iNaturalist via GBIFCochemiea poselgeri, photograph Sula Vanderplank, CC BY, iNaturalist via GBIFCochemiea poselgeri, photograph Sula Vanderplank, CC BY, iNaturalist via GBIFCochemiea poselgeri, photograph Sula Vanderplank, CC BY, iNaturalist via GBIFCochemiea poselgeri, photograph Sula Vanderplank, CC BY, iNaturalist via GBIFCochemiea poselgeri, photograph Sula Vanderplank, CC BY, iNaturalist via GBIF 24 photographs ›
Habitat figures
Cold floor (1 night in 100)
11.5°C
Record low 7.7 °C in 44 years, at a typical spot in the range NASA POWER
Warmest month, mean daily high
33°C
Aug at the habitat CHELSA
Rain a year (median across the range)
205mm
2 months of 25 mm or more in the median year CHELSA
Open-sky light
27–52DLI
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 summers: the rain comes January and August to October, read as a summer growing season. rain rule, CHELSA
Northern hemisphere unless you set your site. The chart is in the habitat's months.

Summary

Cochemiea poselgeri is a species of cactus in the genus Cochemiea commonly known as the Baja California cochemiea. It is endemic to the Mexican state of Baja California Sur.

Quoted from Wikipedia, "Cochemiea poselgeri", CC BY-SA 4.0.

About the genus · Cochemiea

Cochemiea is a genus of cactus. The group was previously synonymized with Mammillaria, until molecular phylogenetic studies determined that—when broadly circumscribed—Mammillaria is not monophyletic; thus, Cochemiea has been accepted as a distinct genus.

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

Cultivation

Grouped as a cactus or succulent, listed under the family Cactaceae in the archetype table, and Kew describes it as “succulent subshrub”.

Seasons

The rain rule reads a summer growing season: 70% of the median year's rain (158 mm of 212 mm) falls in January and August to October, warmer than the year (wet-season mean 25.3 °C against a yearly mean of 23.3 °C). Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: February to April and July.

Rain

212 mm in the median year at the habitat, 158 mm of it January and August to October. Wettest month September at 69 mm, driest month May at 0 mm; 4 months under 5 mm. Across the grid cells of the range the year's total runs 146 mm to 380 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 205 mm, is the year's rain at the top of the page; the 212 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: 27 to 52 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 25, 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 11.5 °C, the absolute minimum 7.7 °C, no frost in 44 years (NASA POWER daily minima). Warmest: the 99th-percentile day is 35.6 °C. Monthly means: the coldest month's mean nightly low 14.8 °C in January and February (across the grid cells of the range 11.1 °C to 17.9 °C), the warmest month's mean daily high 32.5 °C in August (median year across the grid cells of the range, CHELSA). Cold floor: 11.5 °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: 49 to 59% 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 +203 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.

Group. Listed under the family Cactaceae in the archetype table, and Kew describes it as “succulent subshrub”. A group is taken only where Kew's description of the species agrees with the table's listing. The table gives no figure and no prose; the cold floor is the habitat's alone.

Climate across the habitat

Habitat months, northern hemisphere

Habitat climate of Cochemiea poselgeri through the yearWarmest month August, mean daily high 33 °C; coldest months January and February, mean nightly low 14.8 °C; 212 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.5°10°15°20°25°30°35°40°35.6° 99th-percentile day, NASA POWER7.7° lowest night in 44 years, NASA POWER°C · day and nightcold quarter050100150200mm rainDLI 27–52RH 49–59%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 71 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 °C23 / 20–2524 / 20–2626 / 21–2728 / 23–3030 / 25–3332 / 27–3632 / 29–3733 / 30–3631 / 29–3530 / 28–3227 / 24–2823 / 21–25
Night °C15 / 11–1815 / 12–1815 / 12–1817 / 14–2019 / 16–2222 / 19–2425 / 22–2726 / 23–2825 / 22–2722 / 19–2619 / 15–2216 / 12–19
Rain mm19 / 16–237 / 6–103 / 2–51 / 0–10 / 0–11 / 0–218 / 10–3750 / 31–9269 / 37–15220 / 9–469 / 6–1615 / 13–20
DLI29 / 28–3035 / 33–3643 / 42–4349 / 48–4952 / 51–5351 / 50–5247 / 45–4844 / 42–4439 / 38–4036 / 35–3731 / 29–3127 / 25–27
RH %54 / 50–5952 / 48–5751 / 46–5549 / 44–5449 / 43–5550 / 44–5654 / 48–5957 / 51–6159 / 53–6356 / 50–6055 / 50–5855 / 51–59
How this section is made
Each figure is the median across the 71 grid cells on land that hold in-range records (80 records in those cells; 3 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 1311:1384 (24.425, -110.775). Over 44 years there: absolute minimum 7.7 °C, 1st-percentile night 11.5 °C, 99th-percentile day 35.6 °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 71 distinct grid cells holding 80 of the 83 in-range records (3 further cells with records at sea, by the elevation layer, left out); extremes and elevation at the typical cell 1311:1384 (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 24.50_-110.625, lapse-corrected +203 m at 6.5 °C/km. Elevation: ETOPO 2022, 325 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.
NativeMexico Northwest · 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 marker24.142, -110.311 · in the densest population, 565 records (83% of those in range)
Kew's description“succulent subshrub” · “desert or dry shrubland” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 684 georeferenced records inside the native range; the climate across the range on the 80 of them in the land cells it reads, of 83 placed to within 10 km; the map shows only the 255 openly licensed ones, which alone would put the marker 7 km away. 1 record outside the WCVP native range not used. 601 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 684 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Cochemiea poselgeri, photograph 1did not loadCochemiea poselgeri, photograph 2did not loadCochemiea poselgeri, photograph 3did not loadCochemiea poselgeri, photograph 4did not loadCochemiea poselgeri, photograph 5did not loadCochemiea poselgeri, photograph 6did not load

Photographs: Alexis López Hernández, CC BY, iNaturalist via GBIF; Sula Vanderplank, CC BY, iNaturalist via GBIF (5).

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

Bursera epinnata Bursera epinnata Southern Elephant Tree Photo: CC BY, Abraham Sánchez RomeroLysiloma candidum Lysiloma candidum Palo blanco Photo: CC BY, Erick Vélez SánchezDistimake aureus Distimake aureus Yellow Morning Glory Photo: CC BY, Bill LevineBursera filicifolia Bursera filicifolia Burseraceae Photo: CC BY, MarvalPhotography19Agave sobria Agave sobria La Paz Agave Photo: CC0, author not statedAdelia brandegeei Adelia brandegeei Brandegee's False-Ocotillo Photo: CC0, author not stated

Other Cochemiea 33 in the reference

Cochemiea albicans Cochemiea albicans Cactaceae Photo: CC BY, Bill LevineCochemiea armillata Cochemiea armillata Los Cabos Nipple Cactus Photo: CC BY, Erick Vélez SánchezCochemiea barbata Cochemiea barbata Green-flowered pincushion cactus Photo: CC BY, ElisaCochemiea blossfeldiana Cochemiea blossfeldiana Cactaceae Photo: CC BY, MarvalPhotography19Cochemiea boolii Cochemiea boolii Cactaceae Photo: CC BY, Norma PiedraCochemiea capensis Cochemiea capensis Cactaceae Photo: CC BY, Abraham Sánchez RomeroCochemiea cerralboa Cochemiea cerralboa Cactaceae Photo: CC0, author not statedCochemiea conoidea Cochemiea conoidea Cactaceae Photo: CC BY, CK2AZCochemiea dioica Cochemiea dioica Coastal Fish Hook Cactus Photo: CC BY, Sue CarnahanCochemiea estebanensis Cochemiea estebanensis Cactaceae Photo: CC BY, Luis Fernando Valdez OjedaCochemiea fraileana Cochemiea fraileana Cactaceae Photo: CC BY, Abraham Sánchez RomeroCochemiea grahamii Cochemiea grahamii Graham's nipple cactus Photo: CC BY, Bruce Hartman all 34 ›

Names & registers

Also known as Cochemiea roseana; Mammillaria poselgeri; Mammillaria radleana; Mammillaria radliana; Mammillaria roseana. (GBIF Backbone)

GBIFPOWOIPNIWFOWikidataWikipediaiNaturalist

The record

Family
Cactaceae
Described by
(Hildm.) Britton & Rose
Native to
Mexico Northwest
Wild records
684 in range · 255 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
Habitat climate climate answeredasked 2026-10-21
Daily extremes (NASA POWER) climate.extremes answeredasked 2026-10-21NASA POWER (MERRA-2) daily 1981–2024, cell 24.50_-110.625, lapse-corrected +203 m at 6.5 °C/km
Wikidata wikidata answeredasked 2026-10-21
Wikipedia wikipedia answeredasked 2026-10-21
iNaturalist photographs, wild inat.photos.wild nothing to reportasked 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 2026-10-21
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 18 datasets via GBIF.org; each carries its own licence.

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