Cycas revoluta Thunb.
Fern Palm, Sago Palm, Sago palm, King sago, Sago cycad, Japanese sago palm, sago cycas
Every figure on this page is derived from public data by a stated rule and says its source; nothing here is written by a person or a model, except the Wikipedia passage, which is quoted and marked as such. How it is made.
Summary
Cycas revoluta is a species of gymnosperm in the family Cycadaceae, native to southern Japan including the Ryukyu Islands. It is one of several species used for the production of sago, as well as an ornamental plant. The sago cycad can be distinguished by a thick coat of fibers on its trunk. The sago cycad is sometimes mistakenly thought to be a palm, although the only similarity between the two is that they look similar and both produce seeds.
Text from Wikipedia, “Cycas revoluta”, CC BY-SA 4.0, quoted as written. Kept separate from everything derived here.
About the genus · Cycas
Cycas is a genus of cycad, and the only genus in the family Cycadaceae with all other genera of cycad being within the Zamiaceae family. Cycas circinalis, a species endemic to India, was the first cycad species to be described in western literature, and is the type species of the genus.
Text from Wikipedia, “Cycas”, CC BY-SA 4.0, quoted as written.
At a glance
Also known as Cycas aurea J.Verschaff.; Cycas inermis Oudem.; Cycas miquelii Warb.; Cycas revoluta subsp. brevifrons Miq.; Cycas revoluta subsp. planifolia Miq. and 9 more.
Cultivation
Grouped as a bulb, tuber or caudex by the genus Cycas, which is reliably one kind of plant (archetype table). The table holds no figure for this group, which spans too much for one minimum; the cold floor is the habitat's alone, and no prose comes from the table.
Its year Rain rule: a summer growing season, March to September in the northern hemisphere (March to September at the habitat, northern).
This species’ habitat figures, and what two fixed rules read from them.
The rain rule reads a summer growing season: 70% of the year's rain (1577 mm of 2188 mm) falls in March to September, warmer than the year (wet-season mean 24.2 °C against a yearly mean of 21.6 °C). Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: September to March.
Read from the median year of CHELSA monthly rainfall and mean temperature across the envelope cells: 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 gives a season to reverse. A reading of the curves, not an observation of the plant.
Rain Habitat rain 2188 mm a year, wettest June at 286 mm, driest December at 92 mm (habitat calendar, northern hemisphere).
This species’ habitat figures, with their source.
2188 mm a year at the habitat, 1577 mm of it March to September. Wettest month June at 286 mm, driest December at 92 mm. Across the envelope cells the year's total runs 1379 mm to 2973 mm (10th to 90th percentile of each cell's own year) (median year across the envelope cells, CHELSA; habitat calendar, northern hemisphere).
CHELSA monthly precipitation, median year across the envelope cells. The rain that falls where the species is recorded; nothing about how the plant takes water.
Light Open sky over the habitat: 16 to 37 mol/m²/day.
This species’ habitat figures, with their source.
Open sky over the habitat: 16 to 37 mol/m²/day across the year (daily light integral, median year across the envelope cells, CHELSA; the lowest 10th-percentile month across the cells is 14, the highest 90th-percentile month 42).
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.
Warmth and air Cold floor 8.6 °C (1st-percentile habitat night, NASA POWER).
This species’ habitat figures, with their source.
Coldest: the 1st-percentile night over 44 years at the typical cell is 8.6 °C, the absolute minimum 4.4 °C, no frost in 44 years (NASA POWER daily minima). Warmest: the 99th-percentile day is 29.8 °C. Monthly means: coldest night 11.6 °C in January (across the envelope cells 1.3 °C to 17.1 °C), warmest day 28.6 °C in August (median year across the envelope cells, CHELSA). Cold floor: 8.6 °C, which is the 1st-percentile night over 44 years at the typical cell (NASA POWER).
NASA POWER daily minima and maxima 1981–2024 at the typical cell, lapse-corrected to its elevation; CHELSA monthly means, median year across the envelope cells, CHELSA. The cold floor is the figure named in its sentence. Not a measured survival limit for any plant in a pot.
Relative humidity at the habitat: 56 to 67% across the year (monthly means, median year across the envelope cells, CHELSA). A figure about the air, saying nothing about how the plant takes water.
CHELSA relative humidity, median year across the envelope cells.
The figures the cards read from are in Climate below, and where they came from in Natural habitat.
Climate across the habitat
Figures by month
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Day °C | 17 / 8–20 | 17 / 9–20 | 19 / 13–22 | 22 / 17–25 | 24 / 21–28 | 27 / 24–30 | 29 / 27–31 | 29 / 28–31 | 28 / 26–30 | 25 / 21–27 | 22 / 16–24 | 19 / 11–21 |
| Night °C | 12 / 1–17 | 13 / 2–17 | 15 / 6–19 | 19 / 11–22 | 22 / 15–24 | 24 / 19–26 | 26 / 23–27 | 26 / 23–27 | 24 / 20–26 | 21 / 14–25 | 17 / 9–22 | 13 / 4–19 |
| Rain mm | 99 / 34–178 | 128 / 53–172 | 166 / 80–243 | 188 / 114–244 | 248 / 164–315 | 286 / 200–439 | 186 / 150–334 | 255 / 147–322 | 248 / 109–327 | 166 / 64–243 | 126 / 46–205 | 92 / 30–159 |
| DLI | 16 / 14–19 | 20 / 16–22 | 26 / 20–27 | 31 / 24–33 | 34 / 27–35 | 33 / 28–37 | 37 / 32–42 | 35 / 31–38 | 30 / 26–34 | 26 / 22–28 | 19 / 17–22 | 16 / 14–20 |
| RH % | 57 / 54–62 | 58 / 55–64 | 60 / 56–65 | 62 / 58–66 | 64 / 61–67 | 67 / 64–70 | 66 / 63–69 | 65 / 62–68 | 63 / 61–66 | 60 / 58–63 | 58 / 56–62 | 56 / 54–61 |
Each figure is the median across the 208 grid cells holding the 283 in-range records, with the 10th–90th percentile span across those cells after the slash where it differs. Extremes and elevation were read at the typical cell 1191:6208 (30.425, 130.425). Over 44 years there: absolute minimum 4.4 °C, 1st-percentile night 8.6 °C, 99th-percentile day 29.8 °C. Normals: CHELSA V2.1 1981–2010 climatology, 0.05° cells (each the mean of ~36 1 km pixels). Envelope: median and 10th–90th percentile of each month across the 208 distinct grid cells holding the 283 in-range records; extremes and elevation at the typical cell 1191:6208 (its coldest month's mean night nearest the median across cells); its position is the cell centre. Extremes: NASA POWER (MERRA-2) daily 1981–2024, cell 30.50_130.625, lapse-corrected +34 m at 6.5 °C/km. Elevation: ETOPO 2022, 71 m (cell mean).
Natural habitat
Photographs
Photographs: no rights reserved · CC0 (5); (c) Cheng-Te Hsu, some rights reserved (CC BY) (2); (c) Steven Bachman, some rights reserved (CC BY).
Photographs: iNaturalist did not answer when this page was built; what is shown came from the sources that did.
Papers naming this species
Works whose title or abstract names Cycas revoluta, most cited first, from OpenAlex (CC0). A mention, not a cultivation source: nothing on this page is drawn from them.
Related
Similar habitat climate the 6 species whose habitat climate is nearest this one's: mean day and night, month by month, and rain on a log scale, in calendar order, so a habitat with the same seasons six months out is far, not near. Nothing else counts: not range, not family.
Hoya carnosa Common Wax-plant
Alsophila lepifera Cyatheaceae
Lagerstroemia subcostata Subcostate Crepe Myrtle
Ficus vaccinioides Moraceae
Elaeagnus oldhamii Elaeagnaceae
Livistona chinensis Chinese Fan PalmOther Cycas 1 in the reference
History & registers
Where this page came from built 2026-09-20 · dossier v2 · node
gbif.species answeredcarried from build of 2026-09-20 (offline re-derivation; the backbone was not asked)gbif.synonyms answeredcarried from build of 2026-09-20 (offline re-derivation; the backbone was not asked)gbif.vernacular answeredcarried from build of 2026-09-20 (offline re-derivation; the backbone was not asked)wcvp.distribution answeredgbif.occurrences answeredGBIF occurrence download https://doi.org/10.15468/dl.3h4zamclimate answeredwikidata answeredcarried from build of 2026-09-20 (rederive); that build: carried from build of 2026-09-19 (rederive); that build: carried from build of 2026-09-19 (rederive)wikipedia answeredcarried from build of 2026-09-20; this build: skippedinat.taxon not askedcarried from build of 2026-09-20 (rederive)inat.photos.wild answeredcarried from build of 2026-09-20; this build: skippedinat.photos.cultivated nothing to reportcarried from build of 2026-09-20 (rederive); that build: carried from build of 2026-09-19 (rederive); that build: carried from build of 2026-09-19 (rederive)commons nothing to reportcarried from build of 2026-09-20 (rederive); that build: carried from build of 2026-09-19 (rederive); that build: carried from build of 2026-09-19 (rederive)gbif.media answeredopenalex answeredcarried from build of 2026-09-20; this build: skippedEvery upstream is recorded as having answered, reported nothing, or refused. Only “nothing to report” is ever shown as an absence. Records came from 140 datasets via GBIF.org; each carries its own licence.