55 photographs › At a glance
- Jan
- Feb
- Mar
- Apr
- May, shaded
- Jun, shaded
- Jul, shaded
- Aug, shaded
- Sep, shaded
- Oct, shaded
- Nov
- Dec
Summary
Hypericum revolutum is a shrub or small tree in the genus Hypericum native to Arabia and Africa. It is evergreen, with leaves opposite, closely spaced and crowded at the ends of branches, c. 20 × 5 mm, green to slightly glaucous, sessile, clasping at the base. Single bright yellow flowers form at the ends of branches, up to 5 cm in diameter, blooming from June to November. Fruit is a reddish-brown capsule, up to 13 × 10 mm.
Quoted from Wikipedia, "Hypericum revolutum", CC BY-SA 4.0.
About the genus · Hypericum
Hypericum is a genus of flowering plants in the family Hypericaceae. The genus has a nearly worldwide distribution, missing only from tropical lowlands, deserts and polar regions. Many Hypericum species are regarded as invasive species and noxious weeds. More on Wikipedia ›
Quoted from Wikipedia, "Hypericum", CC BY-SA 4.0.
Cultivation
Seasons
The rain rule reads a summer growing season: 70% of the median year's rain (878 mm of 1,151 mm) falls in November to April, warmer than the year (wet-season mean 16.6 °C against a yearly mean of 14.8 °C). Months are the habitat's, southern hemisphere; shifted six months for a northern-hemisphere collection: May to October.
Rain
1,151 mm in the median year at the habitat, 878 mm of it November to April. Wettest month December at 160 mm, driest month July at 25 mm. Across the grid cells of the range the year's total runs 889 mm to 3,105 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 1,463 mm, is the year's rain at the top of the page; the 1,151 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: 27 to 38 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 23, the highest 90th-percentile month 42).
Warmth and air
Coldest: the 1st-percentile night over 44 years at a typical spot in the range is 3.0 °C, the absolute minimum -1.2 °C, 7 frost nights in 44 years (NASA POWER daily minima). Warmest: the 99th-percentile day is 34.7 °C. Monthly means: the coldest month's mean nightly low 5.7 °C in July (across the grid cells of the range 2.1 °C to 11.9 °C), the warmest month's mean daily high 22.1 °C in February (median year across the grid cells of the range, CHELSA). Cold floor: 3.0 °C, which is the 1st-percentile night over 44 years at a typical spot in the range (NASA POWER).
Relative humidity at the habitat: 56 to 64% 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 -116 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 17 °C in Jun and Jul to 22 °C in Jan, Feb, Nov and Dec; mean nightly low from 6 °C in Jun and Jul to 13 °C in Jan and Feb. The cold quarter, May to Jul, is the three months around the coldest month's mean nightly low, centred on the 2 months in a row that tie for it. 1,151 mm of rain in the median year (the twelve monthly medians added), the wettest month Dec. The bands show the 10th to 90th percentile across 166 habitat cells. Over 44 years at a typical spot in the range (NASA POWER) the absolute minimum was -1.2 °C and the 99th-percentile day 34.7 °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 | 22 / 15–25 | 22 / 16–26 | 21 / 16–25 | 20 / 15–23 | 19 / 15–22 | 17 / 14–20 | 17 / 13–20 | 18 / 14–21 | 21 / 14–23 | 21 / 14–24 | 22 / 14–24 | 22 / 15–25 |
| Night °C | 13 / 5–16 | 13 / 6–16 | 12 / 6–15 | 10 / 7–14 | 8 / 5–13 | 6 / 3–12 | 6 / 2–12 | 7 / 4–12 | 9 / 5–12 | 10 / 6–13 | 11 / 5–14 | 12 / 5–15 |
| Rain mm | 159 / 19–340 | 150 / 38–294 | 156 / 82–297 | 101 / 55–393 | 55 / 18–389 | 26 / 12–311 | 25 / 8–413 | 30 / 11–430 | 39 / 18–391 | 98 / 55–320 | 152 / 51–256 | 160 / 20–294 |
| DLI | 38 / 32–41 | 38 / 33–42 | 34 / 31–41 | 31 / 28–38 | 29 / 25–37 | 27 / 23–34 | 27 / 23–33 | 31 / 27–36 | 35 / 30–40 | 37 / 29–41 | 37 / 31–41 | 37 / 32–40 |
| RH % | 64 / 50–68 | 64 / 50–68 | 64 / 52–68 | 63 / 57–69 | 58 / 54–69 | 58 / 53–69 | 57 / 52–74 | 56 / 53–74 | 57 / 53–69 | 60 / 55–67 | 62 / 52–67 | 64 / 50–67 |
How this section is made
Natural habitat
How this section is made
Photographs
Photographs: (c) Wynand Uys, some rights reserved (CC BY); (c) alanbedfordshaw, some rights reserved (CC BY-SA); (c) jeanjacquesgodon, some rights reserved (CC BY); (c) Mathew Rees, some rights reserved (CC BY) (3).
Related
Similar habitat climate The 6 nearest by mean daily high, mean nightly low and rain, month by month. How.
Sanicula elata Apiaceae Photo: CC BY, Sunčana Bradley
Sparrmannia ricinocarpa Climbing African Hemp Photo: CC BY, Sunčana Bradley
Hypoestes triflora Acanthaceae Photo: CC BY, Wynand Uys Cyrtanthus huttonii Cliff Firelily Cyphostemma paucidentatum Vitaceae 
Ledebouria monophylla Button-leaf African hyacinth Photo: CC0, author not statedOther Hypericum 106 in the reference
Hypericum adpressum Creeping St. Johnswort Photo: CC BY, Ryan Sorrells
Hypericum aegypticum Egyptian St John's wort Photo: CC BY, Milan Chytrý
Hypericum aethiopicum African St Johns Wort Photo: CC BY, Dr. Alexey Yakovlev
Hypericum anagalloides Tinker's-penny Photo: CC BY, Alexis Tinker-Tsavalas
Hypericum androsaemum Tutsan Photo: CC BY, Kieran Roy Powell
Hypericum annulatum Hypericaceae Photo: CC BY-SA, susan brown
Hypericum ascyron Great St. John's-wort Photo: CC BY, Oleg Kosterin
Hypericum athoum Hypericaceae Photo: CC BY-SA, peganum from Henfield, England
Hypericum balearicum Majorca St John's wort Photo: CC BY, Sheelagh Halsey Hypericum beanii St. Johnswort 
Hypericum bellum Hypericaceae Photo: CC BY-SA, Nick all 107 ›Names & registers
Also known as Hypericum lanuriense; Hypericum ruwenzoriense. (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 2026-10-21; 8 records within 1 km of a botanic garden, herbarium or zoo left out (8 at a botanic garden or arboretum; Wikidata's list)climate answeredasked 2026-10-22climate.extremes answeredasked 2026-10-22NASA POWER (MERRA-2) daily 1981–2024, cell -25.00_30.625, lapse-corrected -116 m at 6.5 °C/kmwikidata 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 49 datasets via GBIF.org; each carries its own licence.