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Parkinsonia microphylla; photograph (c) Rachel Stringham, some rights reserved (CC BY) CC BY(c) Rachel Stringham, some rights reserved (CC BY) · observed growing wild · 2026-09-01

Parkinsonia microphylla Torr.

Yellow paloverde; Littleleaf Palo Verde; Foothill paloverde; Foothills palo verde

Fabaceae · Arizona, California +1

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Parkinsonia microphylla, photograph author not stated, no rights reservedParkinsonia microphylla, photograph author not stated, no rights reservedParkinsonia microphylla, photograph (c) Rachel Stringham, some rights reserved (CC BY)Parkinsonia microphylla, photograph (c) Rachel Stringham, some rights reserved (CC BY)Parkinsonia microphylla, photograph (c) Rachel Stringham, some rights reserved (CC BY)Parkinsonia microphylla, photograph (c) Bruce Hartman, some rights reserved (CC BY) 65 photographs ›
Habitat figures
Cold floor (1 night in 100)
-0.5°C
Record low -6.1 °C in 44 years, at a typical spot in the range NASA POWER
Warmest month, mean daily high
38°C
Jul at the habitat CHELSA
Rain a year (median across the range)
250mm
6 months of 25 mm or more in the median year CHELSA
Open-sky light
21–54DLI
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
A rainy season, December to February and July to September, neither the cool nor the warm half of the year. rain rule, CHELSA
Northern hemisphere unless you set your site. The chart is in the habitat's months.

Summary

Parkinsonia microphylla, the yellow paloverde, foothill paloverde or little-leaved palo verde; syn. Cercidium microphyllum), is a species of palo verde.

Quoted from Wikipedia, "Parkinsonia microphylla", CC BY-SA 4.0.

About the genus · Parkinsonia

Parkinsonia, also Cercidium, is a genus of flowering plants in the pea family, Fabaceae. It contains about 12 species that are native to semidesert regions of Africa and the Americas. The name of the genus honors English apothecary and botanist John Parkinson (1567–1650).

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

Cultivation

Seasons

The rain rule reads a rainy season with no name: 70% of the median year's rain (172 mm of 243 mm) falls in December to February and July to September, whose mean temperature, 21.5 °C, is within half a degree of the year's, 21.8 °C, so it is neither the cooler nor the warmer part of the year. Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: January to March and June to August.

Rain

243 mm in the median year at the habitat, 172 mm of it December to February and July to September. Wettest month August at 42 mm, driest month June at 2 mm; 2 months under 5 mm. Across the grid cells of the range the year's total runs 115 mm to 381 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 250 mm, is the year's rain at the top of the page; the 243 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: 21 to 54 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 19, the highest 90th-percentile month 55).

Warmth and air
Temperature

Coldest: the 1st-percentile night over 44 years at a typical spot in the range is -0.5 °C, the absolute minimum -6.1 °C, 220 frost nights in 44 years, 5.0 a year (NASA POWER daily minima). Warmest: the 99th-percentile day is 44.2 °C. Monthly means: the coldest month's mean nightly low 5.5 °C in January and December (across the grid cells of the range 3.1 °C to 12.6 °C), the warmest month's mean daily high 37.9 °C in July (median year across the grid cells of the range, CHELSA). Cold floor: -0.5 °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: 35 to 49% 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 -130 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 Parkinsonia microphylla through the yearWarmest month July, mean daily high 38 °C; coldest months January and December, mean nightly low 5.5 °C; 243 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°50°frost44.2° 99th-percentile day, NASA POWER-6.1° lowest night in 44 years, NASA POWER°C · day and nightcold quarter0255075mm rainDLI 21–54RH 35–49%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 545 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 °C18 / 16–2220 / 18–2324 / 21–2628 / 25–3033 / 29–3537 / 32–4038 / 34–4137 / 33–4035 / 32–3729 / 27–3223 / 21–2618 / 16–22
Night °C6 / 3–137 / 4–139 / 7–1513 / 10–1718 / 15–2023 / 20–2426 / 23–2826 / 23–2822 / 20–2616 / 14–2110 / 7–176 / 3–13
Rain mm25 / 12–4126 / 8–4123 / 4–398 / 1–143 / 0–72 / 1–727 / 8–6742 / 17–6925 / 13–6118 / 7–2517 / 7–2627 / 14–39
DLI23 / 22–2729 / 27–3339 / 37–4248 / 47–4953 / 52–5354 / 52–5548 / 46–5044 / 42–4539 / 39–4133 / 31–3625 / 24–2921 / 19–25
RH %49 / 44–5247 / 43–5144 / 40–4939 / 36–4736 / 34–4835 / 32–4743 / 40–5246 / 43–5444 / 41–5543 / 40–5144 / 41–5149 / 45–53
How this section is made
Each figure is the median across the 545 grid cells on land that hold in-range records (1608 records in those cells; 1 more cell holds records but no land by the elevation layer, so those records sit at sea and the cell is 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 1151:1375 (32.425, -111.225). Over 44 years there: absolute minimum -6.1 °C, 1st-percentile night -0.5 °C, 99th-percentile day 44.2 °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 545 distinct grid cells holding 1608 of the 1609 in-range records (1 further cell with records at sea, by the elevation layer, left out); extremes and elevation at the typical cell 1151:1375 (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 32.50_-111.250, lapse-corrected -130 m at 6.5 °C/km. Elevation: ETOPO 2022, 608 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.
NativeArizona, California, Mexico 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 marker32.452, -111.48 · in the densest population, 1323 records (75% of those in range)
Kew's description“shrub or tree” · “desert or dry shrubland” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 1771 georeferenced records inside the native range; the climate across the range on the 1608 of them in the land cells it reads, of 1609 placed to within 10 km; the map shows only the 780 openly licensed ones, which alone would put the marker 36 km away. 4 records outside the WCVP native range not used. 162 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 1771 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Parkinsonia microphylla, photograph 1did not loadParkinsonia microphylla, photograph 2did not loadParkinsonia microphylla, photograph 3did not loadParkinsonia microphylla, photograph 4did not loadParkinsonia microphylla, photograph 5did not loadParkinsonia microphylla, photograph 6did not load

Photographs: author not stated, no rights reserved · CC0 (2); (c) Rachel Stringham, some rights reserved (CC BY) (3); (c) Bruce Hartman, some rights reserved (CC BY).

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

Ambrosia deltoidea Ambrosia deltoidea Triangle bursage Photo: CC BY, Matt BergerCylindropuntia bigelovii Cylindropuntia bigelovii Cactaceae Photo: CC BY-SA, Cactus.manAgave simplex Agave simplex Simple desert agave Photo: CC0, author not statedCarnegiea gigantea Carnegiea gigantea Saguaro Photo: CC BY, Harrison J ElkinsAmbrosia ambrosioides Ambrosia ambrosioides Big bursage Photo: CC BY, Bruce HartmanSenna covesii Senna covesii Coues' senna Photo: CC BY, Rachel Stringham

Other Parkinsonia 5 in the reference

Parkinsonia aculeata Parkinsonia aculeata Jerusalem thorn Photo: CC BY-SA, Douglas GoldmanParkinsonia florida Parkinsonia florida Blue paloverde Photo: CC BY, CK2AZParkinsonia praecox Parkinsonia praecox Sonoran palo verde Photo: CC BY, Abraham Sánchez RomeroParkinsonia × sonorae Parkinsonia × sonorae Fabaceae Photo: CC BY, Abraham Sánchez RomeroParkinsonia texana Parkinsonia texana Texas paloverde Photo: CC BY, johnyochum

Names & registers

Also known as Cercidiopsis microphylla; Cercidium microphyllum. (GBIF Backbone)

GBIFPOWOIPNIWFOWikidataWikipediaiNaturalist

The record

Family
Fabaceae
Described by
Torr.
Native to
Arizona, California, Mexico Northwest
Wild records
1771 in range · 780 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; 52 records within 1 km of a botanic garden, herbarium or zoo left out (52 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 32.50_-111.250, lapse-corrected -130 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 56 datasets via GBIF.org; each carries its own licence.

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