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Salix serissima; photograph author not stated, no rights reserved CC0author not stated, no rights reserved · observed growing wild · 2025-07-14

Salix serissima (L.H.Bailey ex Arthur) Fernald

Autumn willow

Salicaceae · Nunavut, Northwest Territories +25

Cited as Kew's World Checklist cites it, Salix serissima (L.H.Bailey ex Arthur) Fernald: GBIF's backbone key for this page carries the name with another author, (Bailey) Fernald.

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Salix serissima, photograph (c) Dustin Snider, some rights reserved (CC BY)Salix serissima, photograph (c) Dustin Snider, some rights reserved (CC BY)Salix serissima, photograph (c) Dustin Snider, some rights reserved (CC BY)Salix serissima, photograph (c) Dustin Snider, some rights reserved (CC BY)Salix serissima, photograph (c) Sam Turner, some rights reserved (CC BY)Salix serissima, photograph (c) Y. Liu, some rights reserved (CC BY) 112 photographs ›
Habitat figures
Cold floor (1 night in 100)
-31.6°C
Record low -45.6 °C in 44 years, at a typical spot in the range NASA POWER
Warmest month, mean daily high
25°C
Jul at the habitat CHELSA
Rain a year (median across the range)
781mm
11 months of 25 mm or more in the median year CHELSA
Open-sky light
8–40DLI
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 April 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

Salix serissima is a species of flowering plant in the willow family known by the common names autumn willow and fall willow. It is native to North America, where it is distributed across much of Canada and the northern contiguous United States.

Quoted from Wikipedia, "Salix serissima", CC BY-SA 4.0.

Cultivation

Seasons

The rain rule reads a summer growing season: 70% of the median year's rain (586 mm of 749 mm) falls in April to October, warmer than the year (wet-season mean 13.6 °C against a yearly mean of 5.4 °C). Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: October to April.

Rain

749 mm in the median year at the habitat, 586 mm of it April to October. Wettest month June at 101 mm, driest month February at 22 mm. Across the grid cells of the range the year's total runs 448 mm to 1,041 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 781 mm, is the year's rain at the top of the page; the 749 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: 8 to 40 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 4, the highest 90th-percentile month 43).

Warmth and air
Temperature

Coldest: the 1st-percentile night over 44 years at a typical spot in the range is -31.6 °C, the absolute minimum -45.6 °C, 7,631 frost nights in 44 years, 173.4 a year (NASA POWER daily minima). Warmest: the 99th-percentile day is 32.2 °C. Monthly means: the coldest month's mean nightly low -14.2 °C in January (across the grid cells of the range -20.1 °C to -8.9 °C), the warmest month's mean daily high 25.1 °C in July (median year across the grid cells of the range, CHELSA). Cold floor: -31.6 °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: 55 to 65% 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 +27 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 Salix serissima through the yearWarmest month July, mean daily high 25 °C; coldest month January, mean nightly low -14.2 °C; 749 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°frost32.2° 99th-percentile day, NASA POWER-45.6° lowest night in 44 years, NASA POWER°C · day and nightcold quarter0255075100125mm rainDLI 8–40RH 55–65%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 403 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-6 / -12–-1-3 / -8–13 / -2–711 / 5–1418 / 12–2022 / 18–2525 / 22–2724 / 21–2619 / 16–2212 / 7–153 / -2–8-4 / -10–1
Night °C-14 / -20–-9-12 / -17–-8-7 / -11–-30 / -5–37 / 2–1013 / 8–1516 / 12–1816 / 11–1811 / 6–145 / 0–7-3 / -9–1-11 / -17–-5
Rain mm25 / 17–7322 / 13–6340 / 19–6864 / 27–9281 / 45–101101 / 69–12295 / 69–11287 / 59–11187 / 42–10471 / 29–10046 / 21–9230 / 18–81
DLI11 / 6–1317 / 13–1925 / 22–2733 / 31–3537 / 36–4040 / 38–4340 / 37–4234 / 30–3625 / 21–2717 / 13–1910 / 7–128 / 4–10
RH %65 / 61–7164 / 59–6859 / 56–6355 / 53–5855 / 53–5857 / 55–6058 / 56–6059 / 57–6159 / 56–6159 / 57–6262 / 59–6564 / 61–70
How this section is made
Each figure is the median across the 403 grid cells holding the 469 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 876:1724 (46.175, -93.775). Over 44 years there: absolute minimum -45.6 °C, 1st-percentile night -31.6 °C, 99th-percentile day 32.2 °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 403 distinct grid cells holding 469 of the 469 in-range records; extremes and elevation at the typical cell 876:1724 (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 46.00_-93.750, lapse-corrected +27 m at 6.5 °C/km. Elevation: ETOPO 2022, 388 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.
NativeNunavut, Northwest Territories, Alberta, British Columbia, Manitoba, Saskatchewan, Labrador, New Brunswick, Newfoundland, Québec, Colorado, Montana, Wyoming, Illinois, Minnesota, North Dakota, South Dakota, Wisconsin, Connecticut, Indiana, Massachusetts, Michigan, New Jersey, New York, Ohio, Pennsylvania, Vermont · introduced: Finland · 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 marker47.246, -95.245 · in the densest population, 342 records (36% of those in range)
Kew's description“tree” · “temperate” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 948 georeferenced records inside the native range; the climate across the range on the 469 of them placed to within 10 km; the map shows only the 577 openly licensed ones, which alone would put the marker 84 km away. 117 records outside the WCVP native range not used. 479 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 948 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Salix serissima, photograph 1did not loadSalix serissima, photograph 2did not loadSalix serissima, photograph 3did not loadSalix serissima, photograph 4did not loadSalix serissima, photograph 5did not loadSalix serissima, photograph 6did not load

Photographs: (c) Dustin Snider, some rights reserved (CC BY) (4); (c) Sam Turner, some rights reserved (CC BY); (c) Y. Liu, some rights reserved (CC BY).

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

Symphyotrichum boreale Symphyotrichum boreale Northern bog aster Photo: CC BY, Alex BaxterBetula pumila Betula pumila Bog birch Photo: CC0, author not statedAgastache foeniculum Agastache foeniculum Blue giant-hyssop Photo: CC BY, Liren VargheseLathyrus venosus Lathyrus venosus Veiny pea Photo: CC0, author not statedZizania palustris Zizania palustris Northern wildrice Photo: CC BY, Lorna GrantSchizachne purpurascens Schizachne purpurascens Purple false melic Photo: CC0, author not stated

Other Salix 159 in the reference

Salix acmophylla Salix acmophylla Common Middle East willow Photo: CC BY, Nachman bonesSalix acutifolia Salix acutifolia Siberian violet-willow Photo: CC0, author not statedSalix aegyptiaca Salix aegyptiaca Salicaceae Photo: Public domain, Daderot Salix aeruginosa Salicaceae Salix alatavica Salicaceae Salix alaxensis Salix alaxensis Felt-leaf willow Photo: CC BY, Ingvild RiskaSalix alba Salix alba White willow Photo: CC BY, Codrin BucurSalix alpina Salix alpina Salicaceae Photo: CC0, author not statedSalix amygdaloides Salix amygdaloides Peach-leaf willow Photo: CC0, author not statedSalix apennina Salix apennina Large-leaved willow Photo: CC BY, Milan ChytrýSalix apoda Salix apoda Salicaceae Photo: CC BY, Dmitriy BochkovSalix appendiculata Salix appendiculata Salicaceae Photo: CC BY, Tom and T Herman all 160 ›

Names & registers

Also known as Pleiarina serissima; Salix arguta var. alpigena; Salix lucida var. serissima. (GBIF Backbone)

GBIFPOWOIPNIWFOWikidataWikipediaiNaturalist

The record

Family
Salicaceae
Described by
(L.H.Bailey ex Arthur) Fernald
Native to
Nunavut, Northwest Territories, Alberta +24
Wild records
948 in range · 577 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 2026-10-22GBIF's key 5372979 is Salix serissima (Bailey) Fernald; the page links Kew's Salix serissima (L.H.Bailey ex Arthur) Fernald, and the name is cited as Kew cites it
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; 6 records within 1 km of a botanic garden, herbarium or zoo left out (4 at a botanic garden or arboretum, 2 at a zoo; 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 46.00_-93.750, lapse-corrected +27 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 68 datasets via GBIF.org; each carries its own licence.

Cultifolio

Opening your plants…