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Corydalis micrantha; photograph (c) Jeff Hansen, some rights reserved (CC BY) CC BY(c) Jeff Hansen, some rights reserved (CC BY) · observed growing wild · 2026-04-23

Corydalis micrantha (Engelm. ex A.Gray) A.Gray ex J.M.Coult.

Golden Corydalis; Smallflower Fumewort

Papaveraceae · Illinois, Iowa +11

Cited as Kew's World Checklist cites it, Corydalis micrantha (Engelm. ex A.Gray) A.Gray ex J.M.Coult.: GBIF's backbone key for this page carries the name with another author, (Engelm. & A.Gray) A.Gray ex J.M.Coult.

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Corydalis micrantha, photograph author not stated, no rights reservedCorydalis micrantha, photograph author not stated, no rights reservedCorydalis micrantha, photograph author not stated, no rights reservedCorydalis micrantha, photograph author not stated, no rights reservedCorydalis micrantha, photograph author not stated, no rights reservedCorydalis micrantha, photograph (c) Jeff Hansen, some rights reserved (CC BY) 69 photographs ›
Habitat figures
Cold floor (1 night in 100)
-6.3°C
Record low -17.0 °C in 44 years, at a typical spot in the range NASA POWER
Warmest month, mean daily high
33°C
Jul and Aug at the habitat CHELSA
Rain a year (median across the range)
1,006mm
12 months of 25 mm or more in the median year CHELSA
Open-sky light
16–42DLI
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
Rain spread: 70% of the median year's rain takes 8 months, so no short rainy season. rain rule, CHELSA
Northern hemisphere unless you set your site. The chart is in the habitat's months.

Summary

Corydalis micrantha is a species of flowering plant in the poppy family (Papaveraceae), native to the United States. Common names include smallflower fumewort, slender corydalis, southern corydalis, and golden corydalis.

Quoted from Wikipedia, "Corydalis micrantha", CC BY-SA 4.0.

About the genus · Corydalis

Corydalis is a genus of about 540 species of annual and perennial herbaceous plants in the family Papaveraceae, native to the temperate Northern Hemisphere and the high mountains of tropical eastern Africa. They are most diverse in China and the Himalayas, with at least 357 species in China. Corydalis species are the only dicots having only a single cotyledon.

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

Cultivation

Seasons

The rain rule reads no short rainy season: 70% of the median year's rain (758 mm of 1,005 mm) takes 8 months, March to October. Mean temperature moves 21.0 °C between the warmest and coldest month. Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: September to April.

Rain

1,005 mm in the median year at the habitat, 758 mm of it March to October. Wettest month May at 119 mm, driest month January at 52 mm. Across the grid cells of the range the year's total runs 728 mm to 1,326 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 1,006 mm, is the year's rain at the top of the page; the 1,005 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: 16 to 42 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 11, the highest 90th-percentile month 44).

Warmth and air
Temperature

Coldest: the 1st-percentile night over 44 years at a typical spot in the range is -6.3 °C, the absolute minimum -17.0 °C, 1,770 frost nights in 44 years, 40.2 a year (NASA POWER daily minima). Warmest: the 99th-percentile day is 40.3 °C. Monthly means: the coldest month's mean nightly low 3.3 °C in January (across the grid cells of the range -8.5 °C to 7.4 °C), the warmest month's mean daily high 33.3 °C in August (median year across the grid cells of the range, CHELSA). Cold floor: -6.3 °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: 55 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 +1 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 Corydalis micrantha through the yearWarmest months July and August, mean daily high 33 °C; coldest month January, mean nightly low 3.3 °C; 1,005 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.-20°-10°0°10°20°30°40°50°frost40.3° 99th-percentile day, NASA POWER-17.0° lowest night in 44 years, NASA POWER°C · day and nightcold quarter0255075100125150mm rainDLI 16–42RH 55–58%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 531 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 °C13 / 0–1715 / 3–1919 / 10–2324 / 17–2727 / 22–3031 / 27–3333 / 28–3533 / 28–3529 / 24–3224 / 17–2719 / 10–2214 / 2–18
Night °C3 / -9–75 / -6–99 / -1–1213 / 6–1618 / 12–2022 / 17–2324 / 20–2524 / 19–2520 / 15–2215 / 8–189 / 1–134 / -6–9
Rain mm52 / 22–9759 / 26–10181 / 45–11483 / 59–116119 / 86–150115 / 92–14989 / 52–12077 / 51–11689 / 71–119105 / 61–13174 / 38–12362 / 28–112
DLI18 / 14–1922 / 20–2428 / 27–3035 / 33–3737 / 37–4041 / 40–4242 / 40–4439 / 35–4132 / 29–3425 / 21–2719 / 14–2116 / 11–18
RH %58 / 56–6258 / 56–6057 / 55–5955 / 54–5858 / 56–6158 / 56–6157 / 54–6156 / 53–6057 / 55–5957 / 55–5858 / 56–5958 / 57–62
How this section is made
Each figure is the median across the 531 grid cells on land that hold in-range records (631 records in those cells; 2 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 1135:1769 (33.225, -91.525). Over 44 years there: absolute minimum -17.0 °C, 1st-percentile night -6.3 °C, 99th-percentile day 40.3 °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 531 distinct grid cells holding 631 of the 633 in-range records (2 further cells with records at sea, by the elevation layer, left out); extremes and elevation at the typical cell 1135:1769 (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 33.00_-91.250, lapse-corrected +1 m at 6.5 °C/km. Elevation: ETOPO 2022, 36 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.
NativeIllinois, Iowa, Kansas, Minnesota, Missouri, Nebraska, Oklahoma, South Dakota, Wisconsin, Texas, Arkansas, North Carolina, Tennessee · introduced: Delaware · 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 marker32.732, -97.153 · in the densest population, 727 records (80% of those in range)
Kew's description“annual or biennial” · “temperate” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 913 georeferenced records inside the native range; the climate across the range on the 631 of them in the land cells it reads, of 633 placed to within 10 km; the map shows only the 562 openly licensed ones, which alone would put the marker 90 km away. 339 records outside the WCVP native range not used. 280 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.
Other GBIF keysRecords also from GBIF's key 5334198 (Corydalis micrantha (Engelm. ex A.Gray) A.Gray): Kew's file holds it as Corydalis micrantha (Engelm. ex A.Gray) A.Gray ex J.M.Coult. (accepted); 224 records, from GBIF's search API on the day of the build.
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 913 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Corydalis micrantha, photograph 1did not loadCorydalis micrantha, photograph 2did not loadCorydalis micrantha, photograph 3did not loadCorydalis micrantha, photograph 4did not loadCorydalis micrantha, photograph 5did not loadCorydalis micrantha, photograph 6did not load

Photographs: author not stated, no rights reserved · CC0 (5); (c) Jeff Hansen, some rights reserved (CC BY).

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

Cornus drummondii Cornus drummondii Rough-leaf dogwood Photo: CC BY, Jeff HansenViola missouriensis Viola missouriensis Missouri violet Photo: CC BY, Tanner BarnharstDichanthelium oligosanthes Dichanthelium oligosanthes Few-flowered panicgrass Photo: CC BY, Nathan AaronViburnum rufidulum Viburnum rufidulum Blue haw Photo: CC BY, Kevin FaccendaSolidago radula Solidago radula Western rough goldenrod Photo: CC BY, saltyhikerRosa foliolosa Rosa foliolosa White prairie rose Photo: CC BY-SA, Chris Acree

Other Corydalis 90 in the reference

Corydalis adunca Corydalis adunca Papaveraceae Photo: CC BY, Wang.QG Corydalis afghanica Papaveraceae Corydalis aitchisonii Papaveraceae Corydalis ambigua Corydalis ambigua Small corydalis Photo: CC BY, Pavel SmirnovCorydalis angustifolia Corydalis angustifolia Papaveraceae Photo: CC BY, Denis IbaevCorydalis aurea Corydalis aurea Golden corydalis Photo: CC BY, Matt BergerCorydalis balansae Corydalis balansae Papaveraceae Photo: CC0, author not statedCorydalis benecincta Corydalis benecincta Papaveraceae Photo: CC BY, Morten Ross Corydalis blanda Papaveraceae Corydalis bracteata Corydalis bracteata Large-bracted corydalis Photo: CC BY, Marina E.Corydalis bungeana Corydalis bungeana Bunge’s corydalis Photo: CC BY, Jane CharlenCorydalis buschii Corydalis buschii Busch's corydalis Photo: CC BY, Andrew Bazdyrev all 91 ›

Names & registers

Also known as Capnoides campestre; Corydalis micrantha var. micrantha; Neckeria micrantha. (GBIF Backbone)

GBIFPOWOIPNIWFOWikidataWikipediaiNaturalist

The record

Family
Papaveraceae
Described by
(Engelm. ex A.Gray) A.Gray ex J.M.Coult.
Native to
Illinois, Iowa, Kansas +10
Wild records
913 in range · 562 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 2026-10-21GBIF's key 7623441 is Corydalis micrantha (Engelm. & A.Gray) A.Gray ex J.M.Coult.; the page links Kew's Corydalis micrantha (Engelm. ex A.Gray) A.Gray ex J.M.Coult., and the name is cited as Kew cites it
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 answeredasked 2026-10-21GBIF occurrence download https://doi.org/10.15468/dl.hbdw64, of 2026-10-21; 224 records of GBIF's key 5334198, Corydalis micrantha (Engelm. ex A.Gray) A.Gray (Kew's file holds it as Corydalis micrantha (Engelm. ex A.Gray) A.Gray ex J.M.Coult. (accepted)): GBIF occurrence search API; 27 records within 1 km of a botanic garden, herbarium or zoo left out (16 at a botanic garden or arboretum, 3 at a herbarium, 8 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 33.00_-91.250, lapse-corrected +1 m at 6.5 °C/km
Wikidata wikidata answeredasked 2026-10-21found by its label; its IPNI identifier 66396-2 is Kew's for Corydalis micrantha (Engelm. ex A.Gray) A.Gray ex J.M.Coult.
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 77 datasets via GBIF.org; each carries its own licence.

Cultifolio

Opening your plants…