69 photographs › At a glance
- Jan, shaded
- Feb, shaded
- Mar, shaded
- Apr
- May
- Jun, under 5 mm of rain
- Jul, under 5 mm of rain
- Aug, under 5 mm of rain
- Sep, under 5 mm of rain
- Oct
- Nov
- Dec, shaded
Summary
Constancea is a monotypic genus of flowering plants in the family Asteraceae containing the single species Constancea nevinii (formerly Eriophyllum nevinii), which is known by the common name Nevin's woolly sunflower. It is endemic to three of the Channel Islands of California, where it grows in coastal scrub habitat. This is a small shrub or subshrub generally growing up to one or 1.5 meters tall, and taller when an erect form, with a branching, woolly stem. The whitish, woolly oval leaves may be up to 20 centimeters long and are divided into many narrow lobes with edges curled under. More on Wikipedia ›
Quoted from Wikipedia, "Constancea", CC BY-SA 4.0.
Cultivation
Seasons
The rain rule reads a winter growing season: 70% of the median year's rain (198 mm of 261 mm) falls in December to March, cooler than the year (wet-season mean 13.8 °C against a yearly mean of 15.8 °C). Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: June to September.
Rain
261 mm in the median year at the habitat, 198 mm of it December to March. Wettest month February at 59 mm, driest months (2 at 1 mm); 4 months under 5 mm. Across the grid cells of the range the year's total runs 234 mm to 342 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 261 mm, is the year's rain at the top of the page; the 261 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: 19 to 50 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 18, the highest 90th-percentile month 51).
Warmth and air
Monthly means: the coldest month's mean nightly low 12.9 °C in February (across the grid cells of the range 12.4 °C to 13.2 °C), the warmest month's mean daily high 19.4 °C in August (median year across the grid cells of the range, CHELSA). Cold floor: none read. The nearest figure is 12.9 °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 77% 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 14 °C in Feb and Mar to 19 °C in Jul, Aug and Sep; mean nightly low from 13 °C in Jan, Feb, Mar and Dec to 18 °C in Aug and Sep. The cold quarter, Dec to Feb, is the three months around the coldest month's mean nightly low, centred on the 4 months in a row that tie for it. 261 mm of rain in the median year (the twelve monthly medians added), the wettest month Feb. The bands show the 10th to 90th percentile across 16 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 | 15 / 14–15 | 14 / 14–15 | 14 / 14–15 | 15 / 14–15 | 16 / 16–16 | 17 / 17–17 | 19 / 18–19 | 19 / 19–20 | 19 / 19–19 | 18 / 18–19 | 17 / 16–17 | 15 / 14–15 |
| Night °C | 13 / 12–13 | 13 / 12–13 | 13 / 13–13 | 14 / 13–14 | 15 / 14–15 | 16 / 16–16 | 17 / 17–18 | 18 / 18–18 | 18 / 18–18 | 17 / 17–17 | 15 / 15–16 | 13 / 13–14 |
| Rain mm | 51 / 46–73 | 59 / 53–79 | 45 / 41–54 | 15 / 13–19 | 5 / 4–6 | 2 / 2–3 | 1 | 1 | 4 / 4–5 | 12 / 10–15 | 23 / 21–31 | 43 / 38–58 |
| DLI | 21 / 20–22 | 27 / 25–28 | 36 / 35–37 | 44 / 44–45 | 48 / 48–49 | 50 / 49–51 | 49 / 49–51 | 47 / 46–47 | 39 / 38–40 | 31 / 30–32 | 23 / 22–24 | 19 / 18–20 |
| RH % | 59 / 56–60 | 61 / 58–62 | 64 / 61–65 | 65 / 62–66 | 69 / 67–72 | 72 / 69–77 | 77 / 70–86 | 77 / 69–85 | 73 / 67–79 | 66 / 62–68 | 60 / 57–62 | 59 / 56–60 |
The daily extremes were read at a NASA POWER cell that is 4% 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 7.3 °C, 1st-percentile night 9.6 °C, 99th-percentile day 20.5 °C.
How this section is made
Natural habitat
How this section is made
Photographs
Photographs: (c) Melanie J. Davis, some rights reserved (CC BY) (3); (c) Sula Vanderplank, 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.
Hazardia cana San Clemente Island bristleweed Photo: CC BY, Melanie J. Davis
Artemisia nesiotica Island sagebrush Photo: CC BY, william_hoyer
Munzothamnus blairii Blair's wirelettuce Photo: CC BY, Melanie J. Davis
Triteleia clementina San Clemente Island triteleia Photo: CC BY, Adam J. Searcy
Dudleya virens Bright green dudleya Photo: CC BY, Casey H. Richart
Crossosoma californicum California Crossosoma Photo: CC BY, Aaron KreisbergNames & registers
Also known as Eriophyllum nevinii. (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.synonyms answeredasked 2026-10-21gbif.vernacular answeredasked 2026-10-21names fetched 2026-10-21wcvp.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; 7 records within 1 km of a botanic garden, herbarium or zoo left out (6 at a botanic garden or arboretum, 1 at a zoo; Wikidata's list)climate answeredasked 2026-10-21climate.extremes answeredasked 2026-10-21NASA POWER (MERRA-2) daily 1981–2024, cell 33.00_-118.750, lapse-corrected +250 m at 6.5 °C/km; read, and set aside: NASA POWER's cell is mostly sea (4% land), so no cold floor is shownwikidata answeredasked 2026-10-21wikipedia answeredasked 2026-10-21Wikipedia redirects Constancea nevinii to Constancea, this species' genus (Q15991148), which holds one accepted species in Kew's WCVPinat.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 2026-10-21openalex 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 17 datasets via GBIF.org; each carries its own licence.