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Erigeron howellii; photograph (c) Dee Shea Himes, some rights reserved (CC BY) CC BY(c) Dee Shea Himes, some rights reserved (CC BY) · observed growing wild · 2026-06-01

Erigeron howellii A.Gray

Howell's Daisy; Howell's fleabane

Asteraceae · Oregon, Washington

Cited as Kew's World Checklist cites it, Erigeron howellii A.Gray: GBIF's backbone key for this page carries the name with another author, (A.Gray) A.Gray.

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Erigeron howellii, photograph (c) Dee Shea Himes, some rights reserved (CC BY)Erigeron howellii, photograph (c) Dee Shea Himes, some rights reserved (CC BY)Erigeron howellii, photograph (c) Dee Shea Himes, some rights reserved (CC BY)Erigeron howellii, photograph (c) Dee Shea Himes, some rights reserved (CC BY)Erigeron howellii, photograph author not stated, no rights reservedErigeron howellii, photograph author not stated, no rights reserved 37 photographs ›
Habitat figures
Cold floor (1 night in 100)
-9.3°C
Record low -21.5 °C in 44 years, at a typical spot in the range NASA POWER
Warmest month, mean daily high
25°C
Jul and Aug at the habitat CHELSA
Rain a year (median across the range)
2,374mm
12 months of 25 mm or more in the median year CHELSA
Open-sky light
6–45DLI
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 October to March, with nights below freezing; no growing season read. rain rule, CHELSA
Northern hemisphere unless you set your site. The chart is in the habitat's months.

Summary

Erigeron howellii is a rare North American species of flowering plant in the family Asteraceae known as Howell's fleabane. It has been found in the Cascades in the northwestern United States, in northwestern Oregon and southwestern Washington.

Quoted from Wikipedia, "Erigeron howellii", CC BY-SA 4.0.

About the genus · Erigeron

Erigeron is a large genus of plants in the composite family (Asteraceae). It is placed in the tribe Astereae and is closely related to the Old World asters (Aster) and the true daisies (Bellis). The genus has a cosmopolitan distribution, and the highest diversity occurs in North America.

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

Cultivation

Seasons

The rain rule reads a rainy season and no growing season: 70% of the median year's rain (1,788 mm of 2,340 mm) falls in October to March, the cooler part of the year, but the mean nightly low is below freezing in February, March and January, so the rule reads no growing season from it. Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: April to September.

Rain

2,340 mm in the median year at the habitat, 1,788 mm of it October to March. Wettest month November at 369 mm, driest month July at 27 mm. Across the grid cells of the range the year's total runs 1,983 mm to 2,748 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 2,374 mm, is the year's rain at the top of the page; the 2,340 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: 6 to 45 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 5, the highest 90th-percentile month 46).

Warmth and air
Temperature

Coldest: the 1st-percentile night over 44 years at a typical spot in the range is -9.3 °C, the absolute minimum -21.5 °C, 2,407 frost nights in 44 years, 54.7 a year (NASA POWER daily minima). Warmest: the 99th-percentile day is 33.8 °C. Monthly means: the coldest month's mean nightly low -1.4 °C in December (across the grid cells of the range -2.5 °C to -0.5 °C), the warmest month's mean daily high 25.4 °C in August (median year across the grid cells of the range, CHELSA). Cold floor: -9.3 °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: 56 to 68% 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 -242 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 Erigeron howellii through the yearWarmest months July and August, mean daily high 25 °C; coldest month December, mean nightly low -1.4 °C; 2,340 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.-30°-20°-10°0°10°20°30°40°frost33.8° 99th-percentile day, NASA POWER-21.5° lowest night in 44 years, NASA POWER°C · day and nightcold quarter0100200300400500mm rainDLI 6–45RH 56–68%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 13 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 °C5 / 4–67 / 5–810 / 8–1213 / 11–1517 / 15–1920 / 18–2225 / 23–2725 / 23–2722 / 20–2315 / 13–178 / 6–94 / 3–5
Night °C-1 / -2–00 / -2–12 / -1–33 / 1–57 / 4–89 / 7–1112 / 10–1312 / 10–1410 / 8–126 / 4–82 / 0–3-1 / -3–-1
Rain mm336 / 300–409260 / 223–306259 / 215–301174 / 143–209132 / 112–147102 / 87–11427 / 22–3133 / 27–3984 / 70–98198 / 163–233369 / 309–434366 / 328–445
DLI7 / 6–1013 / 12–1621 / 19–2329 / 28–3135 / 34–3740 / 39–4145 / 44–4640 / 38–4129 / 27–3116 / 15–198 / 7–106 / 5–8
RH %67 / 64–6964 / 62–6663 / 62–6563 / 62–6461 / 60–6261 / 60–6258 / 57–5856 / 56–5757 / 57–5862 / 60–6368 / 66–7066 / 64–70
How this section is made
Each figure is the median across the 13 grid cells holding the 36 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 886:1160 (45.675, -121.975). Over 44 years there: absolute minimum -21.5 °C, 1st-percentile night -9.3 °C, 99th-percentile day 33.8 °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 13 distinct grid cells holding 36 of the 36 in-range records; extremes and elevation at the typical cell 886:1160 (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 45.50_-121.875, lapse-corrected -242 m at 6.5 °C/km. Elevation: ETOPO 2022, 370 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, Washington · 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 marker45.613, -121.996 · in the densest population, 49 records (100% of those in range)
Evidence usedThe map marker rests on all 49 georeferenced records inside the native range; the climate across the range on the 36 of them placed to within 10 km; the map shows only the 30 openly licensed ones, which alone would put the marker in the same place. 13 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 49 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Erigeron howellii, photograph 1did not loadErigeron howellii, photograph 2did not loadErigeron howellii, photograph 3did not loadErigeron howellii, photograph 4did not loadErigeron howellii, photograph 5did not loadErigeron howellii, photograph 6did not load

Photographs: (c) Dee Shea Himes, some rights reserved (CC BY) (4); author not stated, no rights reserved · CC0 (2).

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

Iris tenuis Iris tenuis Clackamas iris Photo: CC BY, Sam LeiningerPenstemon ovatus Penstemon ovatus Broad-leaved beardtongue Photo: CC BY, Cris WallerAchlys californica Achlys californica California deer-foot Photo: CC BY, Murray McGooganCampanula scouleri Campanula scouleri Scouler's harebell Photo: CC BY, tmaxMitellastra caulescens Mitellastra caulescens Leafy mitrewort Photo: CC BY, Judi SandersCoptis laciniata Coptis laciniata Oregon goldthread Photo: CC0, author not stated

Other Erigeron 67 in the reference

Erigeron acris Erigeron acris Blue fleabane Photo: CC0, author not statedErigeron alpiniformis Erigeron alpiniformis Alpine fleabane Photo: CC BY, Ingvild RiskaErigeron alpinus Erigeron alpinus Alpine fleabane Photo: CC BY, Claude KolwelterErigeron altaicus Erigeron altaicus Asteraceae Photo: CC BY-SA, Krzysztof Ziarnek, KenraizErigeron annuus Erigeron annuus Tall fleabane Photo: CC BY, Tom ScavoErigeron aphanactis Erigeron aphanactis Rayless shaggy fleabane Photo: CC0, author not statedErigeron atticus Erigeron atticus Greek fleabane Photo: CC BY, Yves BasErigeron aurantiacus Erigeron aurantiacus Orange daisy Photo: CC BY, Paul DufourErigeron aureus Erigeron aureus Alpine yellow fleabane Photo: CC BY, Caleb CattoErigeron bellioides Erigeron bellioides Bellorita Photo: CC0, author not statedErigeron bloomeri Erigeron bloomeri Scabland fleabane Photo: CC0, author not statedErigeron bonariensis Erigeron bonariensis Argentine fleabane Photo: CC BY, smathichong all 68 ›

Names & registers

Also known as Erigeron salsuginosus var. howellii. (GBIF Backbone)

GBIFPOWOIPNIWFOWikidataWikipediaiNaturalist

The record

Family
Asteraceae
Described by
A.Gray
Native to
Oregon, Washington
Wild records
49 in range · 30 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 3147389 is Erigeron howellii (A.Gray) A.Gray; the page links Kew's Erigeron howellii A.Gray, 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
Habitat climate climate answeredasked 2026-10-22
Daily extremes (NASA POWER) climate.extremes answeredasked 2026-10-22NASA POWER (MERRA-2) daily 1981–2024, cell 45.50_-121.875, lapse-corrected -242 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 2026-10-22none of the photographs on this page is credited to GBIF: those shown are other sources', and GBIF's were the same photographs or were set aside by the photograph rules
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 6 datasets via GBIF.org; each carries its own licence.

Cultifolio

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