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Blumea megacephala; photograph (c) 如此甚好, some rights reserved (CC BY) CC BY(c) 如此甚好, some rights reserved (CC BY) · observed growing wild · 2026-06-08

Blumea megacephala (Randeria) C.T.Chang & C.H.Yu

Big-flowered Blumea

Asteraceae · China South-Central, China Southeast +5

Cited as Kew's World Checklist cites it, Blumea megacephala (Randeria) C.T.Chang & C.H.Yu: GBIF's backbone key for this page carries the name with another author, (Randeria) Ching & Tseng.

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Blumea megacephala, photograph (c) 呂一起(Lyu yi-chi), some rights reserved (CC BY)Blumea megacephala, photograph (c) 呂一起(Lyu yi-chi), some rights reserved (CC BY)Blumea megacephala, photograph (c) 呂一起(Lyu yi-chi), some rights reserved (CC BY)Blumea megacephala, photograph (c) 許文俊, some rights reserved (CC BY-SA)Blumea megacephala, photograph (c) 許文俊, some rights reserved (CC BY-SA)Blumea megacephala, photograph (c) 許文俊, some rights reserved (CC BY-SA) 67 photographs ›
Habitat figures
Cold floor (1 night in 100)
8.6°C
Record low 2.5 °C in 44 years, at a typical spot in the range NASA POWER
Warmest month, mean daily high
29°C
Jul at the habitat CHELSA
Rain a year (median across the range)
3,059mm
12 months of 25 mm or more in the median year CHELSA
Open-sky light
18–36DLI
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 May to September, read as a summer growing season. rain rule, CHELSA
Northern hemisphere unless you set your site. The chart is in the habitat's months.

Cultivation

Seasons

The rain rule reads a summer growing season: 70% of the median year's rain (1,981 mm of 2,823 mm) falls in May to September, warmer than the year (wet-season mean 25.8 °C against a yearly mean of 21.4 °C). Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: November to March.

Rain

2,823 mm in the median year at the habitat, 1,981 mm of it May to September. Wettest month September at 444 mm, driest month December at 58 mm. Across the grid cells of the range the year's total runs 2,118 mm to 4,286 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 3,059 mm, is the year's rain at the top of the page; the 2,823 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: 18 to 36 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 13, the highest 90th-percentile month 38).

Warmth and air
Temperature

Coldest: the 1st-percentile night over 44 years at a typical spot in the range is 8.6 °C, the absolute minimum 2.5 °C, no frost in 44 years (NASA POWER daily minima). Warmest: the 99th-percentile day is 29.3 °C. Monthly means: the coldest month's mean nightly low 11.4 °C in January (across the grid cells of the range 6.6 °C to 14.1 °C), the warmest month's mean daily high 28.8 °C in July (median year across the grid cells of the range, CHELSA). Cold floor: 8.6 °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: 63 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 +262 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 Blumea megacephala through the yearWarmest month July, mean daily high 29 °C; coldest month January, mean nightly low 11.4 °C; 2,823 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.0°5°10°15°20°25°30°35°29.3° 99th-percentile day, NASA POWER2.5° lowest night in 44 years, NASA POWER°C · day and nightcold quarter0200400600800mm rainDLI 18–36RH 63–68%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 334 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 °C17 / 14–1918 / 15–2020 / 18–2224 / 21–2526 / 23–2728 / 25–2929 / 26–3028 / 26–3027 / 24–2925 / 22–2722 / 19–2419 / 15–20
Night °C11 / 7–1412 / 8–1515 / 11–1718 / 14–2021 / 17–2323 / 19–2524 / 20–2623 / 20–2622 / 18–2420 / 15–2217 / 12–1913 / 8–15
Rain mm68 / 27–236140 / 57–292168 / 77–243203 / 143–256327 / 260–436416 / 300–587381 / 224–638413 / 263–696444 / 227–613136 / 62–51869 / 38–39558 / 31–266
DLI18 / 13–2320 / 15–2525 / 20–3129 / 25–3331 / 27–3332 / 29–3436 / 33–3833 / 30–3529 / 28–3126 / 22–2921 / 16–2518 / 13–22
RH %64 / 60–7265 / 63–7266 / 63–7266 / 64–7267 / 64–7167 / 63–7166 / 64–7068 / 65–7167 / 65–7165 / 61–7164 / 59–7163 / 59–71
How this section is made
Each figure is the median across the 334 grid cells holding the 1047 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 1312:6016 (24.375, 120.825). Over 44 years there: absolute minimum 2.5 °C, 1st-percentile night 8.6 °C, 99th-percentile day 29.3 °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 334 distinct grid cells holding 1047 of the 1047 in-range records; extremes and elevation at the typical cell 1312:6016 (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 24.50_120.625, lapse-corrected +262 m at 6.5 °C/km. Elevation: ETOPO 2022, 510 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.
NativeChina South-Central, China Southeast, Nansei-shoto, Taiwan, Assam, Vietnam, Jawa · 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 marker24.648, 121.093 · in the densest population, 1006 records (71% of those in range)
Kew's description“subtropical” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 1412 georeferenced records inside the native range; the climate across the range on the 1047 of them placed to within 10 km; the map shows only the 296 openly licensed ones, which alone would put the marker 30 km away. 4 records outside the WCVP native range not used. 365 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 5395623 (Blumea megacephala (Randeria) C.T.Chang & C.H.Yu ex Y.Ling, 1979): Kew's file holds it as Blumea megacephala (Randeria) C.T.Chang & C.H.Yu (accepted); 4 records, from GBIF's search API on the day of the build.Records also from GBIF's key 9076994 (Blumea megacephala C.T.Chang & C.H.Yu): Kew's file holds it as Blumea megacephala (Randeria) C.T.Chang & C.H.Yu (accepted); 0 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 of the 1412 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Blumea megacephala, photograph 1did not loadBlumea megacephala, photograph 2did not loadBlumea megacephala, photograph 3did not loadBlumea megacephala, photograph 4did not loadBlumea megacephala, photograph 5did not loadBlumea megacephala, photograph 6did not load

Photographs: (c) 呂一起(Lyu yi-chi), some rights reserved (CC BY) (3); (c) 許文俊, some rights reserved (CC BY-SA) (3).

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

Bonnaya ruelloides Bonnaya ruelloides Linderniaceae Photo: CC BY, Yung-Lun LinPhanera championii Phanera championii Champion's Bauhinia Photo: CC BY, W RaoDavallia griffithiana Davallia griffithiana Griffith Humata Photo: CC0, author not statedPersicaria chinensis Persicaria chinensis Chinese knotweed Photo: CC BY, Ben CostamagnaMachilus zuihoensis Machilus zuihoensis Incense Machilus Photo: CC BY, 如此甚好Polyspora axillaris Polyspora axillaris Fried Egg Tree Photo: CC BY, 呂一起(Lyu yi-chi)

Other Blumea 6 in the reference

Blumea axillaris Blumea axillaris Asteraceae Photo: CC BY-SA, Tony RebeloBlumea balsamifera Blumea balsamifera Ngai camphor Photo: CC0, author not statedBlumea lacera Blumea lacera Malay blumea Photo: CC0, author not statedBlumea lanceolaria Blumea lanceolaria Asteraceae Photo: CC BY, Yinling ChenBlumea linearis Blumea linearis Asteraceae Photo: CC BY, 呂一起(Lyu yi-chi)Blumea sinuata Blumea sinuata Cut-leaf false oxtongue Photo: CC BY, 黃美滿

Names & registers

Also known as Blumea riparia var. megacephala. (GBIF Backbone)

GBIFPOWOIPNIWFOWikidataiNaturalist

The record

Family
Asteraceae
Described by
(Randeria) C.T.Chang & C.H.Yu
Native to
China South-Central, China Southeast, Nansei-shoto +4
Wild records
1412 in range · 296 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 7358042 is Blumea megacephala (Randeria) Ching & Tseng; the page links Kew's Blumea megacephala (Randeria) C.T.Chang & C.H.Yu, 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; 4 records of GBIF's key 5395623, Blumea megacephala (Randeria) C.T.Chang & C.H.Yu ex Y.Ling, 1979 (Kew's file holds it as Blumea megacephala (Randeria) C.T.Chang & C.H.Yu (accepted)): GBIF occurrence search API; 0 records of GBIF's key 9076994, Blumea megacephala C.T.Chang & C.H.Yu (Kew's file holds it as Blumea megacephala (Randeria) C.T.Chang & C.H.Yu (accepted)): GBIF occurrence search API; 25 records within 1 km of a botanic garden, herbarium or zoo left out (17 at a botanic garden or arboretum, 2 at a herbarium, 6 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 24.50_120.625, lapse-corrected +262 m at 6.5 °C/km
Wikidata wikidata answeredasked 2026-10-21found by its label; its POWO identifier 185629-1 is Kew's for Blumea megacephala (Randeria) C.T.Chang & C.H.Yu
Wikipedia wikipedia nothing to reportasked 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 28 datasets via GBIF.org; each carries its own licence.

Cultifolio

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