Codon royenii D.Royen
Honeybush; White Codon; White Nectarcup
Cited as Kew's World Checklist cites it, Codon royenii D.Royen: GBIF's backbone key for this page carries the name with another author, L.
64 photographs › At a glance
- Jan, shaded
- Feb, shaded
- Mar, shaded, under 5 mm of rain
- Apr, shaded
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov, shaded
- Dec, shaded
Summary
Codon royenii is a species of flowering plant in the genus Codon. It is native to Namibia and the Northern Cape Province of South Africa. It is also known by the names honey bush or white nectarcup, or in Afrikaans as heuningbos and suikerkelk (meaning sugar cup).
Quoted from Wikipedia, "Codon royenii", CC BY-SA 4.0.
Cultivation
Seasons
Rain at the habitat is 88 mm in the median year (across the grid cells of the range, CHELSA). Under 120 mm the rain rule reads no rainy season, and the growing-season rule infers nothing from it. The temperature rule reads the cooler six months as May to October. Months are the habitat's, southern hemisphere; shifted six months for a northern-hemisphere collection: November to April.
Rain
88 mm in the median year at the habitat. Wettest month April at 15 mm, driest month September at 4 mm; 1 month under 5 mm. Across the grid cells of the range the year's total runs 53 mm to 280 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 120 mm, is the year's rain at the top of the page; the 88 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: 23 to 56 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 20, the highest 90th-percentile month 57).
Warmth and air
Coldest: the 1st-percentile night over 44 years at a typical spot in the range is 1.5 °C, the absolute minimum -1.3 °C, 31 frost nights in 44 years (NASA POWER daily minima). Warmest: the 99th-percentile day is 42.5 °C. Monthly means: the coldest month's mean nightly low 6.6 °C in July (across the grid cells of the range 4.9 °C to 9.8 °C), the warmest month's mean daily high 31.4 °C in January and February (median year across the grid cells of the range, CHELSA). Cold floor: 1.5 °C, which is the 1st-percentile night over 44 years at a typical spot in the range (NASA POWER).
Relative humidity at the habitat: 48 to 49% 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 -97 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
Mean daily high from 20 °C in Jun and Jul to 31 °C in Jan, Feb and Mar; mean nightly low from 7 °C in Jun, Jul and Aug to 17 °C in Feb. The cold quarter, Jun to Aug, is the three months around the coldest month's mean nightly low, centred on the 3 months in a row that tie for it. 88 mm of rain in the median year (the twelve monthly medians added), the wettest month Apr. The bands show the 10th to 90th percentile across 238 habitat cells. Over 44 years at a typical spot in the range (NASA POWER) the absolute minimum was -1.3 °C and the 99th-percentile day 42.5 °C; neither is dated to a month. 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 | 31 / 29–35 | 31 / 29–35 | 31 / 28–33 | 27 / 25–30 | 24 / 21–27 | 20 / 17–24 | 20 / 17–24 | 22 / 19–26 | 25 / 22–28 | 27 / 25–30 | 29 / 26–32 | 30 / 28–34 |
| Night °C | 16 / 15–19 | 17 / 15–19 | 16 / 15–19 | 14 / 12–16 | 10 / 9–13 | 7 / 5–10 | 7 / 5–10 | 7 / 6–10 | 10 / 8–12 | 12 / 10–14 | 13 / 12–16 | 15 / 13–17 |
| Rain mm | 7 / 3–25 | 8 / 5–36 | 13 / 6–33 | 15 / 9–24 | 6 / 2–37 | 5 / 1–45 | 6 / 1–44 | 5 / 0–36 | 4 / 1–23 | 6 / 2–17 | 7 / 2–12 | 6 / 2–15 |
| DLI | 55 / 53–56 | 50 / 48–51 | 43 / 41–44 | 34 / 31–37 | 27 / 24–32 | 23 / 20–29 | 25 / 22–31 | 31 / 27–36 | 40 / 36–43 | 48 / 45–50 | 54 / 52–55 | 56 / 55–57 |
| RH % | 49 / 42–54 | 49 / 44–54 | 48 / 44–52 | 49 / 43–52 | 48 / 41–52 | 49 / 41–53 | 48 / 40–52 | 49 / 39–53 | 49 / 39–53 | 48 / 39–53 | 48 / 40–53 | 49 / 41–54 |
How this section is made
Natural habitat
How this section is made
Photographs
Photographs: (c) Caroline Voget, some rights reserved (CC BY); author not stated, no rights reserved · CC0; (c) Stefan Wolmarans, 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.
Crassula sericea Crassulaceae Photo: CC0, author not stated
Osteospermum polypterum Marguerite Photo: CC BY, Caroline Voget
Pelargonium spinosum Thorny pelargonium Photo: CC0, author not stated Lapeirousia littoralis Spider Kabong Colchicum exiguum Colchicaceae 
Aloidendron pillansii Bastard quiver tree Photo: CC BY-SA, Tony RebeloNames & registers
Also known as Codon aculeatum. (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 2026-10-21
gbif.species answeredasked 2026-10-21GBIF's key 7782072 is Codon royenii L.; the page links Kew's Codon royenii D.Royen, and the name is cited as Kew cites itgbif.synonyms answeredasked 2026-10-21gbif.vernacular answeredasked 2026-10-21names fetched 2026-10-21wcvp.distribution answeredas of 2026-06-04gbif.occurrences answeredasked 2026-10-21GBIF occurrence download https://doi.org/10.15468/dl.hbdw64, of 2026-10-21; 495 records of GBIF's key 11045727, Codon royenii D.Royen, 1767 (Kew's file holds it as Codon royenii D.Royen (accepted)): GBIF occurrence search API; 1 record within 1 km of a botanic garden, herbarium or zoo left out (1 at a botanic garden or arboretum; Wikidata's list)climate answeredasked 2026-10-21climate.extremes answeredasked 2026-10-21NASA POWER (MERRA-2) daily 1981–2024, cell -27.00_17.500, lapse-corrected -97 m at 6.5 °C/kmwikidata answeredasked 2026-10-21wikipedia answeredasked 2026-10-21inat.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 2026-10-21read from the page's key and its other keys: 197 from GBIF's key 11045727openalex 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 19 datasets via GBIF.org; each carries its own licence.