Example ⟳ +
An example collection, so you can see what this page does. Nothing added here is kept: leaving deletes it.

Arenga oblongifolia (Griff.) Jeanson

Arecaceae · China South-Central, Assam +5

English names not checked: Wikidata's common names were not read for this page.

Photographs not checked iNaturalist and GBIF media were skipped (not asked) when this page was built. Not asked, or not answered, is not "none": nothing here claims there is none. Why the site says it this way.
Add one to my plants
Sow seed
Habitat figuresfrom few records
Cold floor (1 night in 100)
4.7°C
Record low 1.5 °C in 44 years, at a typical spot in the range NASA POWER
Warmest month, mean daily high
27°C
Jun, Jul and Aug at the habitat CHELSA
Rain a year (median across the range)
3,017mm
11 months of 25 mm or more in the median year CHELSA
Open-sky light
23–30DLI
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.

From few records: 9 records in 9 grid cells. The records.

Cultivation

Seasons

The rain rule reads a summer growing season: 70% of the median year's rain (2,578 mm of 3,370 mm) falls in May to September, warmer than the year (wet-season mean 23.3 °C against a yearly mean of 19.5 °C). Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: November to March.

Rain

3,370 mm in the median year at the habitat, 2,578 mm of it May to September. Wettest month July at 675 mm, driest month December at 24 mm. Across the grid cells of the range the year's total runs 1,809 mm to 5,690 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 3,017 mm, is the year's rain at the top of the page; the 3,370 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: 23 to 30 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 19, the highest 90th-percentile month 42).

Warmth and air
Temperature

Coldest: the 1st-percentile night over 44 years at a typical spot in the range is 4.7 °C, the absolute minimum 1.5 °C, no frost in 44 years (NASA POWER daily minima). Warmest: the 99th-percentile day is 33.7 °C. Monthly means: the coldest month's mean nightly low 8.3 °C in January (across the grid cells of the range 5.3 °C to 11.1 °C), the warmest month's mean daily high 27.1 °C in June (median year across the grid cells of the range, CHELSA). Cold floor: 4.7 °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: 58 to 74% 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 -270 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

From few records: this habitat climate is read from 9 records in 9 grid cells; a page says so under 12 records or 5 cells, and shows the figures as read.

Habitat months, northern hemisphere

Habitat climate of Arenga oblongifolia through the yearWarmest months June, July and August, mean daily high 27 °C; coldest month January, mean nightly low 8.3 °C; 3,370 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°10°20°30°40°33.7° 99th-percentile day, NASA POWER1.5° lowest night in 44 years, NASA POWER°C · day and nightcold quarter02004006008001000mm rainDLI 23–30RH 58–74%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 9 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 °C18 / 15–2219 / 15–2522 / 18–3025 / 21–3226 / 23–3227 / 24–3127 / 24–3027 / 25–3026 / 24–3025 / 22–2922 / 19–2619 / 16–23
Night °C8 / 5–119 / 6–1312 / 9–1615 / 12–2017 / 15–2320 / 19–2521 / 20–2521 / 19–2519 / 18–2316 / 14–2012 / 10–169 / 7–13
Rain mm25 / 18–12459 / 23–250166 / 31–271298 / 56–401450 / 154–571511 / 295–860675 / 445–884548 / 392–776394 / 261–810178 / 75–47342 / 8–15524 / 14–115
DLI24 / 19–2625 / 21–3028 / 25–3728 / 27–4230 / 28–4026 / 23–3324 / 20–2625 / 22–2725 / 21–2726 / 23–2925 / 21–2623 / 19–24
RH %60 / 58–6158 / 56–6459 / 51–6564 / 50–6966 / 57–6969 / 66–7474 / 68–7672 / 68–7369 / 68–7264 / 62–6760 / 57–6259 / 58–61
How this section is made
Each figure is the median across the 9 grid cells holding the 9 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 1286:5490 (25.675, 94.525). Over 44 years there: absolute minimum 1.5 °C, 1st-percentile night 4.7 °C, 99th-percentile day 33.7 °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 9 distinct grid cells holding 9 of the 9 in-range records; extremes and elevation at the typical cell 1286:5490 (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 25.50_94.375, lapse-corrected -270 m at 6.5 °C/km. Elevation: ETOPO 2022, 1087 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.

This species has no GBIF key of its own. Its records are GBIF's under the key of the name Kew's World Checklist holds as this plant: 5294575 (Wallichia oblongifolia Griff., 14 records). No name was matched to GBIF; the keys are read from Kew's synonymy. How.

NativeChina South-Central, Assam, Bangladesh, East Himalaya, Nepal, West Himalaya, Myanmar · 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 marker27.294, 92.812 · in the densest population, 5 records (50% of those in range)
Kew's description“shrub” · “subtropical” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 10 georeferenced records inside the native range; the climate across the range on the 9 of them placed to within 10 km; the map shows only the 6 openly licensed ones, which alone would put the marker 789 km away. 2 records outside the WCVP native range not used. Under a dozen records behind the map and the climate. 1 in-range record is placed to worse than 10 km, or with no stated accuracy (admitted only as a person's observation to three decimals), and stays on the map but off the climate.
Other GBIF keysRecords also from GBIF's key 5294575 (Wallichia oblongifolia Griff.): Kew's file holds it as Wallichia oblongifolia Griff. (synonym under Arenga oblongifolia (Griff.) Jeanson); 14 records, from GBIF's download.
How this section is made
The map marker: the openly licensed record nearest the middle of the densest 1° population of the 10 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Not checked. iNaturalist and GBIF media were skipped (not asked) when this page was built. Not a statement that none exist.

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

Musa velutina Musa velutina Pink velvet banana Photo: CC BY, Annika LindqvistDendrobium transparens Dendrobium transparens Orchidaceae Photo: CC BY, Ramesh ShenaiTerminalia myriocarpa Terminalia myriocarpa Hollock Photo: CC BY, Kevin FaccendaCastanopsis indica Castanopsis indica Indian-chestnut Photo: CC BY, 黃美滿Colocasia fallax Colocasia fallax Araceae Photo: CC BY, Sagnik Dutta RoyAerides rosea Aerides rosea Orchidaceae Photo: CC0, author not stated

Other Arenga 11 in the reference

Arenga australasica Arenga australasica Arenga palm Photo: CC BY, coenobitaArenga caudata Arenga caudata Arecaceae Photo: Public domain, Mmcknight4 Arenga disticha Arecaceae Arenga engleri Arenga engleri Formosan sugar palm Photo: CC BY, Yu-Huang WangArenga micrantha Arenga micrantha Arecaceae Photo: CC BY, chintan sheth Arenga obtusifolia Lang kap Arenga pinnata Arenga pinnata Sugar palm Photo: CC BY, Ong Jyh Seng Arenga porphyrocarpa Arecaceae Arenga tremula Arenga tremula Dwarf sugar palm Photo: CC BY-SA, David J. StangArenga undulatifolia Arenga undulatifolia Arecaceae Photo: CC BY, Celestino Quintela SabarísArenga westerhoutii Arenga westerhoutii Arecaceae Photo: CC BY, Zac Peterson

Names & registers

Also known as Wallichia oblongata; Harina densiflora; Wallichia densiflora; Wallichia oblongifolia; Harina oblongifolia. (WCVP, RBG Kew)

IPNIPOWO

The record

Family
Arecaceae
Described by
(Griff.) Jeanson
Native to
China South-Central, Assam, Bangladesh +4
Wild records
10 in range · 6 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
Kew's names (WCVP) kew.names answeredas of 2026-06-04Kew's entry Arenga oblongifolia (Griff.) Jeanson (plant_name_id 3323237), read from Kew's names file
GBIF species record gbif.species not askedGBIF's backbone holds no one accepted species of this name, and a name it holds only as another species' synonym is not taken for this one, so GBIF's records were not asked
GBIF synonyms gbif.synonyms not askedGBIF's backbone holds no one accepted species of this name, and a name it holds only as another species' synonym is not taken for this one, so GBIF's records were not asked
GBIF common names gbif.vernacular not askedGBIF's backbone holds no one accepted species of this name, and a name it holds only as another species' synonym is not taken for this one, so GBIF's records were not asked
WCVP native range wcvp.distribution answeredas of 2026-06-04
GBIF occurrence records gbif.occurrences answeredas of 2026-10-21this species has no GBIF key of its own; its records are read under GBIF's keys for the names Kew's file holds as this plant, never by a name matched; GBIF occurrence download https://doi.org/10.15468/dl.hbdw64, of 2026-10-21; 14 records of GBIF's key 5294575, Wallichia oblongifolia Griff. (Kew's file holds it as Wallichia oblongifolia Griff. (synonym under Arenga oblongifolia (Griff.) Jeanson)): the GBIF download; 1 record within 1 km of a botanic garden, herbarium or zoo left out (1 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 25.50_94.375, lapse-corrected -270 m at 6.5 °C/km
Wikidata wikidata nothing to reportasked 2026-10-22no item carries Kew's IPNI identifier 77369829-1, POWO 77369829-1
Wikipedia wikipedia nothing to reportasked 2026-10-22
iNaturalist taxon inat.taxon not asked
iNaturalist photographs, wild inat.photos.wild not asked
iNaturalist photographs, cultivated inat.photos.cultivated not asked
GBIF media gbif.media not askedGBIF's backbone holds no one accepted species of this name, and a name it holds only as another species' synonym is not taken for this one, so GBIF's records were not asked
Wikimedia Commons commons nothing to reportasked 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 6 datasets via GBIF.org; each carries its own licence.

Cultifolio

Opening your plants…