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Astragalus gambelianus; photograph author not stated, no rights reserved CC0author not stated, no rights reserved · observed growing wild · 2026-04-20

Astragalus gambelianus E.Sheld.

Gambel's dwarf milkvetch; Gambel's milkvetch; Little blue loco

Fabaceae · Oregon, California +1

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Astragalus gambelianus, photograph (c) avephill, some rights reserved (CC BY)Astragalus gambelianus, photograph (c) avephill, some rights reserved (CC BY)Astragalus gambelianus, photograph (c) avephill, some rights reserved (CC BY)Astragalus gambelianus, photograph author not stated, no rights reservedAstragalus gambelianus, photograph author not stated, no rights reservedAstragalus gambelianus, photograph author not stated, no rights reserved 99 photographs ›
Habitat figures
Cold floor (1 night in 100)
-2.3°C
Record low -7.4 °C in 44 years, at a typical spot in the range NASA POWER
Warmest month, mean daily high
30°C
Jul and Aug at the habitat CHELSA
Rain a year (median across the range)
579mm
7 months of 25 mm or more in the median year CHELSA
Open-sky light
15–52DLI
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 winters: the rain comes December 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.

Summary

Astragalus gambelianus is a species of milkvetch known by the common name Gambel's dwarf milkvetch. It is native to California, with its distribution extending into Oregon to the north and Baja California to the south.

Quoted from Wikipedia, "Astragalus gambelianus", CC BY-SA 4.0.

Cultivation

Seasons

The rain rule reads a winter growing season: 70% of the median year's rain (413 mm of 582 mm) falls in December to March, cooler than the year (wet-season mean 9.9 °C against a yearly mean of 15.3 °C). Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: June to September.

Rain

582 mm in the median year at the habitat, 413 mm of it December to March. Wettest month January at 115 mm, driest month July at 1 mm; 3 months under 5 mm. Across the grid cells of the range the year's total runs 325 mm to 1,126 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 579 mm, is the year's rain at the top of the page; the 582 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: 15 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 12, the highest 90th-percentile month 54).

Warmth and air
Temperature

Coldest: the 1st-percentile night over 44 years at a typical spot in the range is -2.3 °C, the absolute minimum -7.4 °C, 567 frost nights in 44 years, 12.9 a year (NASA POWER daily minima). Warmest: the 99th-percentile day is 38.0 °C. Monthly means: the coldest month's mean nightly low 4.2 °C in January (across the grid cells of the range 2.1 °C to 7.8 °C), the warmest month's mean daily high 30.4 °C in July and August (median year across the grid cells of the range, CHELSA). Cold floor: -2.3 °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: 50 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 +119 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 Astragalus gambelianus through the yearWarmest months July and August, mean daily high 30 °C; coldest month January, mean nightly low 4.2 °C; 582 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°frost38.0° 99th-percentile day, NASA POWER-7.4° lowest night in 44 years, NASA POWER°C · day and nightcold quarter050100150200250mm rainDLI 15–52RH 50–58%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 468 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 °C14 / 12–1715 / 13–1717 / 14–1920 / 16–2223 / 19–2827 / 21–3330 / 22–3630 / 23–3528 / 23–3224 / 20–2617 / 15–2014 / 11–17
Night °C4 / 2–85 / 3–97 / 4–98 / 6–1111 / 9–1414 / 11–1717 / 13–1917 / 14–1915 / 13–1711 / 9–147 / 5–115 / 2–8
Rain mm115 / 63–209109 / 70–19388 / 53–15340 / 23–7916 / 6–434 / 2–151 / 0–32 / 1–47 / 5–1531 / 16–5968 / 32–140101 / 48–227
DLI16 / 14–2122 / 19–2631 / 29–3640 / 39–4547 / 46–5152 / 51–5452 / 50–5347 / 46–4839 / 37–4128 / 26–3219 / 16–2415 / 12–20
RH %58 / 52–6258 / 55–6258 / 54–6255 / 51–6153 / 47–6351 / 44–6350 / 42–6350 / 43–6350 / 44–6252 / 47–6155 / 51–6157 / 51–61
How this section is made
Each figure is the median across the 468 grid cells holding the 876 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 1049:1163 (37.525, -121.825). Over 44 years there: absolute minimum -7.4 °C, 1st-percentile night -2.3 °C, 99th-percentile day 38.0 °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 468 distinct grid cells holding 876 of the 876 in-range records; extremes and elevation at the typical cell 1049:1163 (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 37.50_-121.875, lapse-corrected +119 m at 6.5 °C/km. Elevation: ETOPO 2022, 352 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.
NativeOregon, 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 marker37.889, -122.224 · in the densest population, 630 records (52% of those in range)
Kew's description“annual or perennial” · “temperate” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 1203 georeferenced records inside the native range; the climate across the range on the 876 of them placed to within 10 km; the map shows only the 224 openly licensed ones, which alone would put the marker 8 km away. 327 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 1203 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Astragalus gambelianus, photograph 1did not loadAstragalus gambelianus, photograph 2did not loadAstragalus gambelianus, photograph 3did not loadAstragalus gambelianus, photograph 4did not loadAstragalus gambelianus, photograph 5did not loadAstragalus gambelianus, photograph 6did not load

Photographs: (c) avephill, some rights reserved (CC BY) (3); author not stated, no rights reserved · CC0 (3).

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

Calandrinia menziesii Calandrinia menziesii Red-maids Photo: CC BY, Kyle ElshoffPlagiobothrys nothofulvus Plagiobothrys nothofulvus Popcorn-flower Photo: CC0, author not statedTrifolium depauperatum Trifolium depauperatum Poverty clover Photo: CC BY, Abraham Sánchez RomeroClematis lasiantha Clematis lasiantha Pipestem Photo: CC BY, jayjtClarkia unguiculata Clarkia unguiculata Elegant clarkia Photo: CC BY, Jonas KatonaLupinus bicolor Lupinus bicolor Miniature lupine Photo: CC0, author not stated

Other Astragalus 63 in the reference

Astragalus agrestis Astragalus agrestis Purple milkvetch Photo: CC BY, Matt BergerAstragalus alopecuroides Astragalus alopecuroides Fabaceae Photo: CC BY, Franck CabotAstragalus alopecurus Astragalus alopecurus Fabaceae Photo: CC BY, Orzigul AnvarovaAstragalus alpinus Astragalus alpinus Alpine milk-vetch Photo: CC BY, Antoine ThivolleAstragalus angustifolius Astragalus angustifolius Hermon Milk-Vetch Photo: CC0, author not statedAstragalus arenarius Astragalus arenarius Arenarious Milk-vetch Photo: CC BY, Andrejus GaidamavičiusAstragalus aretioides Astragalus aretioides Cushion milkvetch Photo: CC BY, Austin SaundersAstragalus asper Astragalus asper Fabaceae Photo: CC0, author not statedAstragalus australis Astragalus australis Indian milkvetch Photo: CC BY, LjažAstragalus austriacus Astragalus austriacus Fabaceae Photo: CC BY, Анна МитрошенковаAstragalus balearicus Astragalus balearicus Balearic Milk-vetch Photo: CC BY, Codrin BucurAstragalus beypazaricus Astragalus beypazaricus Fabaceae Photo: CC BY-SA, SerdarÖlez all 64 ›

Names & registers

Also known as Astragalus elmeri; Astragalus gambelianus subsp. elmeri; Astragalus gambelianus subsp. gambelianus; Astragalus gambelianus var. elmeri; Astragalus nigrescens and 2 more. (GBIF Backbone)

GBIFPOWOIPNIWFOWikidataWikipediaiNaturalist

The record

Family
Fabaceae
Described by
E.Sheld.
Native to
Oregon, California, Mexico Northwest
Wild records
1203 in range · 224 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; 30 records within 1 km of a botanic garden, herbarium or zoo left out (20 at a botanic garden or arboretum, 6 at a herbarium, 4 at a zoo; 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 37.50_-121.875, lapse-corrected +119 m at 6.5 °C/km
Wikidata wikidata answeredasked 2026-10-21found by its label; its POWO identifier 477537-1 is Kew's for Astragalus gambelianus E.Sheld.
Wikipedia wikipedia answeredasked 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 2026-10-21
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 42 datasets via GBIF.org; each carries its own licence.

Cultifolio

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