26 photographs › At a glance
- Jan
- Feb, under 5 mm of rain
- Mar, under 5 mm of rain
- Apr, under 5 mm of rain
- May, under 5 mm of rain
- Jun, under 5 mm of rain
- Jul
- Aug, shaded
- Sep, shaded
- Oct
- Nov
- Dec, under 5 mm of rain
Summary
Cynanchum daltonii, synonym Sarcostemma daltonii, is a species of flowering plants of the family Apocynaceae. The species is endemic to Cape Verde. The specific name refers to Joseph Dalton Hooker. The species was named by Joseph Decaisne, as Sarcostemma daltonii, in 1849. More on Wikipedia ›
Quoted from Wikipedia, "Cynanchum daltonii", CC BY-SA 4.0.
Cultivation
Seasons
The rain rule reads a summer growing season: 70% of the median year's rain (168 mm of 237 mm) falls in August to September, warmer than the year (wet-season mean 25.4 °C against a yearly mean of 23.2 °C). Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: February to March.
Rain
237 mm in the median year at the habitat, 168 mm of it August to September. Wettest month September at 87 mm, driest months (4 at 1 mm); 6 months under 5 mm. Across the grid cells of the range the year's total runs 127 mm to 357 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 232 mm, is the year's rain at the top of the page; the 237 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: 30 to 47 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 27, the highest 90th-percentile month 47).
Warmth and air
Monthly means: the coldest month's mean nightly low 20.1 °C in February (across the grid cells of the range 19.2 °C to 20.9 °C), the warmest month's mean daily high 26.4 °C in September (median year across the grid cells of the range, CHELSA). Cold floor: none read. The nearest figure is 20.1 °C, the coldest month's mean nightly low, February, in the median year (CHELSA); a month's mean of its nightly lows is warmer than the nights a floor is read from. The daily extremes were read at a weather cell that is mostly sea and are not used.
Relative humidity at the habitat: 59 to 66% 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. CHELSA monthly means, median year across the grid cells of the range. No cold floor is read without a daily extremes series; the coldest month's mean nightly low named in its sentence is not one. 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
Mean daily high from 22 °C in Jan, Feb, Mar and Apr to 26 °C in Aug, Sep and Oct; mean nightly low from 20 °C in Jan, Feb and Mar to 25 °C in Sep. The cold quarter, Jan to Mar, is the three months around the coldest month's mean nightly low, centred on the 3 months in a row that tie for it. 237 mm of rain in the median year (the twelve monthly medians added), the wettest month Sep. The bands show the 10th to 90th percentile across 17 habitat cells. Beneath: daily light integral and relative humidity through the year, each on its own scale.
Figures by month
| Figure | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Day °C | 22 / 20–24 | 22 / 20–24 | 22 / 21–24 | 22 / 22–25 | 24 / 23–25 | 25 / 23–26 | 25 / 24–27 | 26 / 24–28 | 26 / 24–28 | 26 / 23–28 | 25 / 22–27 | 24 / 21–25 |
| Night °C | 20 / 19–21 | 20 / 19–21 | 20 / 19–21 | 21 / 21–23 | 22 / 21–24 | 23 / 22–24 | 23 / 23–24 | 24 / 23–25 | 25 / 23–25 | 24 / 23–25 | 23 / 21–24 | 22 / 20–23 |
| Rain mm | 5 / 4–8 | 3 / 2–4 | 1 / 0–1 | 1 / 0–1 | 1 / 0–1 | 1 / 0–1 | 13 / 5–20 | 81 / 27–125 | 87 / 56–131 | 32 / 16–50 | 8 / 4–15 | 4 / 2–10 |
| DLI | 31 / 29–34 | 37 / 34–38 | 43 / 41–44 | 45 / 43–46 | 47 / 46–47 | 45 / 44–46 | 42 / 41–43 | 40 / 39–41 | 39 / 37–40 | 37 / 35–39 | 33 / 30–35 | 30 / 27–32 |
| RH % | 59 / 44–62 | 60 / 41–63 | 61 / 41–64 | 62 / 44–65 | 63 / 42–66 | 64 / 45–67 | 64 / 54–68 | 66 / 60–68 | 64 / 59–69 | 63 / 52–66 | 61 / 47–64 | 60 / 47–62 |
The daily extremes were read at a NASA POWER cell that is 16% land: neither it nor the next candidates whose coldest month's mean nightly low is within 2 °C of the median across cells sit in a POWER cell that is mostly land, and the rule reads a cold floor only from a cell that is mostly land, so none is read for this species. Nor is the coldest month's mean nightly low taken as one: it is a mean of a month's lows, not its coldest night. What that cell gave over 44 years: absolute minimum 18.2 °C, 1st-percentile night 19.3 °C, 99th-percentile day 28.1 °C.
How this section is made
Natural habitat
How this section is made
Photographs
Photographs: (c) Malcolm Gould, some rights reserved (CC BY); (c) Julius P, some rights reserved (CC BY); (c) fmunoz, some rights reserved (CC BY) (4).
Related
Similar habitat climate The 6 nearest by mean daily high, mean nightly low and rain, month by month. How.
Euphorbia tuckeyana Euphorbiaceae Photo: CC BY, Julius P
Echium hypertropicum Boraginaceae Photo: CC BY, Julius P
Echium stenosiphon Boraginaceae Photo: CC BY, Julius P
Campanula jacobaea Cape Verde Blue Bellflower Photo: CC BY, Milan Chytrý
Dracaena caboverdeana Asparagaceae Photo: CC BY, William Stephens
Globularia amygdalifolia Plantaginaceae Photo: CC BY, dphoneOther Cynanchum 22 in the reference
Cynanchum acutum Stranglewort Photo: CC BY, Léo Souillard
Cynanchum annularium Holostemma Creeper Photo: CC0, S.MORE
Cynanchum boudieri Apocynaceae Photo: CC BY, 謝麗霦
Cynanchum compactum Apocynaceae Photo: CC BY, amantedarmanin
Cynanchum floriferum Apocynaceae Photo: CC0, Bat
Cynanchum gerrardi Swallow-wort Photo: CC BY, Thomas Irvine Cynanchum grandidieri Apocynaceae 
Cynanchum insipidum Apocynaceae Photo: CC BY-SA, Susan Brown
Cynanchum laeve Sandvine Photo: CC BY, Jeff Clark
Cynanchum marnierianum Apocynaceae Photo: CC BY-SA, Engeser
Cynanchum maximoviczii Apocynaceae Photo: CC BY, 岸本年郎
Cynanchum obtusifolium Monkey-rope Photo: CC BY-SA, Nicola van Berkel all 23 ›Names & registers
Also known as Sarcostemma daltonii. (GBIF Backbone)
The record
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 answeredasked 2026-10-22gbif.synonyms answeredasked 2026-10-22gbif.vernacular answeredasked 2026-10-22names fetched 2026-10-22wcvp.distribution answeredas of 2026-06-04gbif.occurrences answeredas of 2026-10-21GBIF occurrence download https://doi.org/10.15468/dl.hbdw64, of 2026-10-21climate answeredasked 2026-10-22climate.extremes answeredasked 2026-10-22NASA POWER (MERRA-2) daily 1981–2024, cell 16.00_-23.125, lapse-corrected +33 m at 6.5 °C/km; read, and set aside: NASA POWER's cell is mostly sea (16% land), so no cold floor is shownwikidata answeredasked 2026-10-22wikipedia answeredasked 2026-10-22inat.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 2026-10-22inat.photos.cultivated not askedgbif.media answeredasked 2026-10-22openalex not askednot yet asked for this reference; a later fill takes the papers from OpenAlex's snapshotEvery 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.