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Anemonastrum richardsonii; photograph lauralaska66, CC BY, iNaturalist via GBIF CC BYlauralaska66, CC BY, iNaturalist via GBIF

Anemonastrum richardsonii (Hook.) Mosyakin

Richardson's anemone; Yellow anemone; Yellow thimbleweed

Ranunculaceae · Yakutskiya, Kamchatka +13

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Anemonastrum richardsonii, photograph lauralaska66, CC BY, iNaturalist via GBIFAnemonastrum richardsonii, photograph lauralaska66, CC BY, iNaturalist via GBIFAnemonastrum richardsonii, photograph lauralaska66, CC BY, iNaturalist via GBIFAnemonastrum richardsonii, photograph Syd Cannings, CC BY, iNaturalist via GBIFAnemonastrum richardsonii, photograph Syd Cannings, CC BY, iNaturalist via GBIFAnemonastrum richardsonii, photograph Syd Cannings, CC BY, iNaturalist via GBIF 24 photographs ›
Habitat figures
Cold floor (1 night in 100)
-39.0°C
Record low -48.5 °C in 44 years, at a typical spot in the range NASA POWER
Warmest month, mean daily high
15°C
Jul at the habitat CHELSA
Rain a year (median across the range)
667mm
12 months of 25 mm or more in the median year CHELSA
Open-sky light
1–37DLI
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 June to December, 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

Anemonastrum richardsonii, commonly known as yellow thimbleweed, is named after a Scottish naturalist, Sir John Richardson (1787–1865) who found it on Franklin's expedition to the Arctic. It is a perennial, deciduous plant that blooms in mid to early June.

Quoted from Wikipedia, "Anemonastrum richardsonii", CC BY-SA 4.0.

About the genus · Anemonastrum

Anemonastrum is a genus of flowering plants in the family Ranunculaceae. Plants of the genus are native to the temperate and subarctic regions of North America, Greenland, Europe, Asia, South America, and New Zealand. The generic name Anemonastrum means "somewhat like anemone", a reference to the Anemone genus of closely related plants. More on Wikipedia ›

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

Cultivation

Seasons

The rain rule reads a summer growing season: 70% of the median year's rain (477 mm of 639 mm) falls in June to December, warmer than the year (wet-season mean -0.2 °C against a yearly mean of -4.5 °C). Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: December to June.

Rain

639 mm in the median year at the habitat, 477 mm of it June to December. Wettest month August at 99 mm, driest month April at 26 mm. Across the grid cells of the range the year's total runs 396 mm to 1,341 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 667 mm, is the year's rain at the top of the page; the 639 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: 1 to 37 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 0, the highest 90th-percentile month 41).

Warmth and air
Temperature

Coldest: the 1st-percentile night over 44 years at a typical spot in the range is -39.0 °C, the absolute minimum -48.5 °C, 11,556 frost nights in 44 years, 262.6 a year (NASA POWER daily minima). Warmest: the 99th-percentile day is 18.6 °C. Monthly means: the coldest month's mean nightly low -21.9 °C in January (across the grid cells of the range -32.5 °C to -12.4 °C), the warmest month's mean daily high 15.1 °C in July (median year across the grid cells of the range, CHELSA). Cold floor: -39.0 °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: 60 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. NASA POWER daily minima and maxima over 44 years at a typical spot in the range, lapse-corrected -23 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 Anemonastrum richardsonii through the yearWarmest month July, mean daily high 15 °C; coldest month January, mean nightly low -21.9 °C; 639 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.-60°-40°-20°0°20°40°frost18.6° 99th-percentile day, NASA POWER-48.5° lowest night in 44 years, NASA POWER°C · day and nightcold quarter050100150200mm rainDLI 1–37RH 60–69%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 869 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-17 / -27–-7-14 / -26–-5-9 / -19–-1-2 / -10–45 / -1–1212 / 8–1815 / 12–1913 / 10–177 / 3–12-2 / -10–4-10 / -20–-3-15 / -25–-6
Night °C-22 / -33–-12-20 / -31–-11-17 / -26–-9-9 / -17–-4-2 / -6–25 / 2–88 / 5–116 / 3–101 / -3–5-8 / -15–-2-16 / -26–-8-20 / -30–-11
Rain mm38 / 18–11732 / 17–9329 / 13–7926 / 12–6537 / 20–7161 / 37–11489 / 57–15699 / 60–17177 / 43–16961 / 32–15248 / 25–13342 / 21–124
DLI2 / 0–47 / 4–1017 / 14–2130 / 27–3337 / 34–4137 / 33–4031 / 27–3623 / 19–2815 / 13–198 / 5–113 / 1–51 / 0–2
RH %69 / 61–8167 / 60–7964 / 59–7362 / 56–7061 / 54–6760 / 55–6661 / 56–6763 / 57–6864 / 59–6866 / 61–7269 / 62–7769 / 61–80
How this section is made
Each figure is the median across the 869 grid cells on land that hold in-range records (1118 records in those cells; 5 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 510:835 (64.475, -138.225). Over 44 years there: absolute minimum -48.5 °C, 1st-percentile night -39.0 °C, 99th-percentile day 18.6 °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 869 distinct grid cells holding 1118 of the 1123 in-range records (5 further cells with records at sea, by the elevation layer, left out); extremes and elevation at the typical cell 510:835 (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 64.50_-138.125, lapse-corrected -23 m at 6.5 °C/km. Elevation: ETOPO 2022, 1203 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.
NativeYakutskiya, Kamchatka, Magadan, Aleutian Is., Alaska, Greenland, Nunavut, Northwest Territories, Yukon, Alberta, British Columbia, Manitoba, Saskatchewan, Labrador, Québec · 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 marker61.769, -149.315 · in the densest population, 400 records (23% of those in range)
Kew's description“perennial” · “subalpine or subarctic” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 1757 georeferenced records inside the native range; the climate across the range on the 1118 of them in the land cells it reads, of 1123 placed to within 10 km; the map shows only the 1237 openly licensed ones, which alone would put the marker 821 km away. 634 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 inside the densest 4° block of the 1757 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Anemonastrum richardsonii, photograph 1did not loadAnemonastrum richardsonii, photograph 2did not loadAnemonastrum richardsonii, photograph 3did not loadAnemonastrum richardsonii, photograph 4did not loadAnemonastrum richardsonii, photograph 5did not loadAnemonastrum richardsonii, photograph 6did not load

Photographs: lauralaska66, CC BY, iNaturalist via GBIF (3); Syd Cannings, CC BY, iNaturalist via GBIF (3).

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

Taraxacum ceratophorum Taraxacum ceratophorum Horned dandelion Photo: CC BY, Matt BergerGentiana glauca Gentiana glauca Pale gentian Photo: CC BY, Matt BergerDiapensia obovata Diapensia obovata Alaska diapensia Photo: CC0, author not statedMicranthes nelsoniana Micranthes nelsoniana Nelson's saxifrage Photo: CC BY, ivansemenkovSaxifraga tricuspidata Saxifraga tricuspidata Prickly saxifrage Photo: CC BY, Matt BergerArtemisia tilesii Artemisia tilesii Tilesius wormwood Photo: CC BY, Matt Berger

Other Anemonastrum 19 in the reference

Anemonastrum baicalense Anemonastrum baicalense Ranunculaceae Photo: CC BY, neyasitAnemonastrum biarmiense Anemonastrum biarmiense Ranunculaceae Photo: CC BY, Сергей КрыленкоAnemonastrum canadense Anemonastrum canadense Canada anemone Photo: CC0, author not statedAnemonastrum coelestinum Anemonastrum coelestinum Ranunculaceae Photo: CC BY, 王天明 Anemonastrum demissum Floppy Himalayan Anemone Anemonastrum dichotomum Anemonastrum dichotomum Dichotomous anemone Photo: CC BY, Юлия Anemonastrum fasciculatum Ranunculaceae Anemonastrum flaccidum Anemonastrum flaccidum Flaccid Anemone Photo: CC BY, WATANABE Hitoshi 渡辺仁Anemonastrum keiskeanum Anemonastrum keiskeanum Ranunculaceae Photo: CC BY, KENPEIAnemonastrum narcissiflorum Anemonastrum narcissiflorum Narcissus anemone Photo: CC BY-SA, xulescu_gAnemonastrum obtusilobum Anemonastrum obtusilobum Himalayan thimbleweed Photo: CC BY, Jagdish Singh NegiAnemonastrum polyanthes Anemonastrum polyanthes Ranunculaceae Photo: CC BY, phiroza all 20 ›

Names & registers

Also known as Anemone arctica; Anemone richardsonii; Anemone trifida; Anemone vahlii; Anemonidium richardsonii and 2 more. (GBIF Backbone)

Under another author Anemone ranunculoides Richardson is an older name of this species, not Anemone ranunculoides, a species of the reference. (GBIF Backbone)

GBIFPOWOIPNIWFOWikidataWikipedia

The record

Family
Ranunculaceae
Described by
(Hook.) Mosyakin
Native to
Yakutskiya, Kamchatka, Magadan +12
Wild records
1757 in range · 1237 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 64.50_-138.125, lapse-corrected -23 m at 6.5 °C/km
Wikidata wikidata answeredasked 2026-10-21
Wikipedia wikipedia answeredasked 2026-10-21
iNaturalist taxon inat.taxon not asked
iNaturalist photographs, wild inat.photos.wild not asked
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 51 datasets via GBIF.org; each carries its own licence.

Cultifolio

Opening your plants…