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Eucalyptus michaeliana; photograph (c) Lucas Christofides, some rights reserved (CC BY) CC BY(c) Lucas Christofides, some rights reserved (CC BY) · observed growing wild · 2026-07-17

Eucalyptus michaeliana Blakely

Hillgrove gum; Brittle gum

Myrtaceae · New South Wales, Queensland

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Eucalyptus michaeliana, photograph (c) Lucas Christofides, some rights reserved (CC BY)Eucalyptus michaeliana, photograph (c) Lucas Christofides, some rights reserved (CC BY)Eucalyptus michaeliana, photograph (c) Lucas Christofides, some rights reserved (CC BY)Eucalyptus michaeliana, photograph (c) Lucas Christofides, some rights reserved (CC BY)Eucalyptus michaeliana, photograph (c) Lucas Christofides, some rights reserved (CC BY)Eucalyptus michaeliana, photograph (c) Lucas Christofides, some rights reserved (CC BY) 41 photographs ›
Habitat figures
Cold floor (1 night in 100)
-0.7°C
Record low -3.6 °C in 44 years, at a typical spot in the range NASA POWER
Warmest month, mean daily high
27°C
Jan at the habitat CHELSA
Rain a year (median across the range)
844mm
12 months of 25 mm or more in the median year CHELSA
Open-sky light
18–42DLI
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
Wet summers: the rain comes April to October (October to April at the habitat), 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

Eucalyptus michaeliana, commonly known as Hillgrove gum or brittle gum, is a species of small to medium-sized tree endemic to eastern Australia. It has smooth mottled greyish bark, lance-shaped to curved adult leaves, flower buds in compound umbels, white flowers and cup-shaped or barrel-shaped fruit.

Quoted from Wikipedia, "Eucalyptus michaeliana", CC BY-SA 4.0.

About the genus · Eucalyptus

Eucalyptus is a genus of more than 700 species of flowering plants in the family Myrtaceae. Most species of Eucalyptus are trees, often mallees, and a few are shrubs. Along with several other genera in the tribe Eucalypteae, including Corymbia and Angophora, they are commonly known as eucalypts or "gum trees". More on Wikipedia ›

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

Cultivation

Seasons

The rain rule reads a summer growing season: 70% of the median year's rain (598 mm of 832 mm) falls in October to April, warmer than the year (wet-season mean 18.3 °C against a yearly mean of 15.0 °C). Months are the habitat's, southern hemisphere; shifted six months for a northern-hemisphere collection: April to October.

Rain

832 mm in the median year at the habitat, 598 mm of it October to April. Wettest month February at 114 mm, driest month July at 41 mm. Across the grid cells of the range the year's total runs 725 mm to 1,043 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 844 mm, is the year's rain at the top of the page; the 832 mm here is the median year's, the twelve monthly medians added, which the rain rule reads. Habitat calendar, southern hemisphere; median year across the grid cells of the range, CHELSA.

Light

Open sky over the habitat: 18 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 16, 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 -0.7 °C, the absolute minimum -3.6 °C, 350 frost nights in 44 years, 8.0 a year (NASA POWER daily minima). Warmest: the 99th-percentile day is 35.0 °C. Monthly means: the coldest month's mean nightly low 3.4 °C in July (across the grid cells of the range 1.5 °C to 6.1 °C), the warmest month's mean daily high 26.6 °C in January (median year across the grid cells of the range, CHELSA). Cold floor: -0.7 °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: 54 to 61% 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 -231 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, southern hemisphere

Habitat climate of Eucalyptus michaeliana through the yearWarmest month January, mean daily high 27 °C; coldest month July, mean nightly low 3.4 °C; 832 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, southern hemisphere.-10°0°10°20°30°40°frost35.0° 99th-percentile day, NASA POWER-3.6° lowest night in 44 years, NASA POWER°C · day and nightcold quarter0255075100125150mm rainDLI 18–42RH 54–61%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 101 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 °C27 / 24–2925 / 23–2723 / 21–2520 / 18–2217 / 15–1914 / 12–1614 / 11–1516 / 13–1720 / 17–2122 / 20–2424 / 21–2526 / 24–27
Night °C16 / 14–1816 / 14–1814 / 12–1611 / 8–138 / 5–105 / 3–73 / 2–64 / 2–77 / 5–910 / 8–1212 / 10–1415 / 12–16
Rain mm96 / 81–128114 / 94–14776 / 63–10664 / 49–8253 / 44–7252 / 37–6541 / 37–5143 / 36–5645 / 39–5470 / 62–8586 / 75–10392 / 80–122
DLI41 / 40–4336 / 34–3832 / 30–3426 / 24–2820 / 18–2118 / 16–1919 / 18–2126 / 24–2734 / 31–3538 / 37–4040 / 39–4242 / 41–44
RH %59 / 58–6261 / 60–6461 / 60–6361 / 60–6261 / 60–6260 / 59–6259 / 58–6156 / 55–5854 / 54–5555 / 54–5757 / 56–5958 / 56–60
How this section is made
Each figure is the median across the 101 grid cells holding the 273 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 2411:6640 (-30.575, 152.025). Over 44 years there: absolute minimum -3.6 °C, 1st-percentile night -0.7 °C, 99th-percentile day 35.0 °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 101 distinct grid cells holding 273 of the 273 in-range records; extremes and elevation at the typical cell 2411:6640 (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 -30.50_151.875, lapse-corrected -231 m at 6.5 °C/km. Elevation: ETOPO 2022, 744 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.
NativeNew South Wales, Queensland · 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 marker-30.607, 151.944 · in the densest population, 179 records (62% of those in range)
Kew's description“tree” · “subtropical” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 291 georeferenced records inside the native range; the climate across the range on the 273 of them placed to within 10 km; the map shows only the 280 openly licensed ones, which alone would put the marker in the same place. 18 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 291 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Eucalyptus michaeliana, photograph 1did not loadEucalyptus michaeliana, photograph 2did not loadEucalyptus michaeliana, photograph 3did not loadEucalyptus michaeliana, photograph 4did not loadEucalyptus michaeliana, photograph 5did not loadEucalyptus michaeliana, photograph 6did not load

Photographs: (c) Lucas Christofides, some rights reserved (CC BY) (6).

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

Dendrobium cucumerinum Dendrobium cucumerinum Cucumber orchid Photo: CC BY, Liam southwellGrevillea beadleana Grevillea beadleana Proteaceae Photo: CC BY-SA, Lachlan CopelandSarga leioclada Sarga leioclada Wild sorghum Photo: CC BY, Eamonn CulhanePetrophile canescens Petrophile canescens Conesticks Photo: CC0, author not statedAcacia adunca Acacia adunca Wallangarra wattle Photo: CC BY, Ivor WilsonAcacia pubifolia Acacia pubifolia Fabaceae Photo: CC BY, Michael Hains

Other Eucalyptus 290 in the reference

Eucalyptus accedens Eucalyptus accedens Powder-bark wandoo Photo: CC BY, Tyler AnthonyEucalyptus aggregata Eucalyptus aggregata Black gum Photo: CC BY, prossingtonEucalyptus alatissima Eucalyptus alatissima Wing-Fruited Mallee Photo: CC BY, Murray FaggEucalyptus alba Eucalyptus alba Timor white gum Photo: CC BY, Roland MuenchEucalyptus albens Eucalyptus albens White box Photo: CC BY, Nina KerrEucalyptus albida Eucalyptus albida White-leaved Mallee Photo: CC BY, Peter CrowcroftEucalyptus albopurpurea Eucalyptus albopurpurea Port Lincoln mallee Photo: CC BY, pimeleaEucalyptus amplifolia Eucalyptus amplifolia Cabbage gum Photo: CC BY, Carl RamirezEucalyptus amygdalina Eucalyptus amygdalina Black peppermint Photo: CC0, author not statedEucalyptus angulosa Eucalyptus angulosa Ridge-fruited mallee Photo: CC0, author not stated Eucalyptus annettae Tookle Jenna Mallet Eucalyptus apodophylla Eucalyptus apodophylla Whitebark Photo: CC BY, Ian Cowie all 291 ›

Names & registers

GBIFPOWOIPNIWFOWikidataWikipediaiNaturalist

The record

Family
Myrtaceae
Described by
Blakely
Native to
New South Wales, Queensland
Wild records
291 in range · 280 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 2026-10-22
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 (6 at a botanic garden or arboretum; 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 -30.50_151.875, lapse-corrected -231 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 10 datasets via GBIF.org; each carries its own licence.

Cultifolio

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