CK2AZ, CC BY, iNaturalist via GBIF · observed growing wild

Sclerocactus johnsonii (Parry ex Engelm.) N.P.Taylor

Eight-spine Fishhook Cactus, Johnson's Barrel Cactus, Johnson's Fishhook Cactus, Pygmy Barrel Cactus

Climate known 24 photographs Cactus or succulent

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

Sclerocactus johnsonii is a species of cactus known by the common names Johnson's beehive cactus and Johnson's fishhook cactus. It is native to the southwestern United States from eastern California to Utah and northwestern Mexico, where it can be found in desert scrub habitat. It produces an egg-shaped or cylindrical stem up to 25 centimetres tall by 10 centimetres wide. It is covered densely in straight and curving spines which may be up to 4 centimetres long and come in shades of yellow, gray, lavender, and pink or red, with up to 24 per areole. More on Wikipedia ›

The opening of Wikipedia, “Sclerocactus johnsonii”, CC BY-SA 4.0, quoted as written. Kept separate from everything derived here.

About the genus · Sclerocactus

Sclerocactus is a genus of cacti. It comprises about 15 species, the exact number depending on the authority. These species are xerophytic. More on Wikipedia ›

The opening of Wikipedia, “Sclerocactus”, CC BY-SA 4.0, quoted as written.

Family

Cactaceae

Described by

(Parry ex Engelm.) N.P.Taylor

Native to

Arizona, California, Nevada +2

Wild records

1466 in range· 752 open

At a glance

Warmest month

39°C

Jul, mean day; nights 25 °C (CHELSA)

Rain

166mm/yr

1 wet month · peak Feb 27 mm (CHELSA)

Light

18–55DLI

mol/m²/day, winter to summer, open sky (CHELSA shortwave)

In short condensed by rule from the cultivation cards · not written by a person

Grouped as a cactus or succulent by Cactaceae, which is usually but not always one kind of plant (archetype table). Rain rule: a winter growing season, December to March, July to August and October in the northern hemisphere (December to March, July to August and October at the habitat, northern). Habitat rain 166 mm a year, wettest February at 27 mm, driest June at 3 mm (habitat calendar, northern hemisphere). Open sky over the habitat: 18 to 55 mol/m²/day. Cold floor -4.1 °C (1st-percentile habitat night, NASA POWER).

Each sentence is one card's own one-line form, written by the same rule as the card (Its year, Rain, Light, Temperature); the note cannot say what a card does not. Months are given for the northern hemisphere (set your site in Settings to change this), and the habitat's own alongside. The cards · the figures.

Also known as Echinoccatus johnsonii Parry; Echinoccatus johnsonii Parry ex Engelm.; Echinomastus johnstonei E.M.Baxter.

Cultivation

Grouped as a cactus or succulent by Cactaceae, which is usually but not always 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 winter growing season, December to March, July to August and October in the northern hemisphere (December to March, July to August and October at the habitat, northern).

This species’ habitat figures, and what two fixed rules read from them.

The rain rule reads a winter growing season: 70% of the year's rain (129 mm of 166 mm) falls in December to March, July to August and October, cooler than the year (wet-season mean 17.8 °C against a yearly mean of 19.7 °C). Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: January to February, April and June to September.

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 166 mm a year, wettest February at 27 mm, driest June at 3 mm (habitat calendar, northern hemisphere).

This species’ habitat figures, with their source.

166 mm a year at the habitat, 129 mm of it December to March, July to August and October. Wettest month February at 27 mm, driest June at 3 mm; 2 months under 5 mm. Across the envelope cells the year's total runs 125 mm to 294 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: 18 to 55 mol/m²/day.

This species’ habitat figures, with their source.

Open sky over the habitat: 18 to 55 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 17, the highest 90th-percentile month 55).

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 -4.1 °C (1st-percentile habitat night, NASA POWER).

This species’ habitat figures, with their source.

Temperature

Coldest: the 1st-percentile night over 44 years at the typical cell is -4.1 °C, the absolute minimum -9.7 °C, about 35 frost nights a year (NASA POWER daily minima). Warmest: the 99th-percentile day is 43.8 °C. Monthly means: coldest night 2.8 °C in January (across the envelope cells 0.6 °C to 4.4 °C), warmest day 38.5 °C in July (median year across the envelope cells, CHELSA). Cold floor: -4.1 °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.

Humidity

Relative humidity at the habitat: 33 to 48% 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

day night rain 10th–90th percentile across 156 habitat cells cold quarter: the three months around the coldest night extremes over 44 years at the typical cell, marked at the edge: undated DLI, mol/m²/dayRH %each on its own scale

Figures by month

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Day °C	14 / 12–16	16 / 14–18	20 / 18–22	25 / 23–27	31 / 28–33	36 / 33–38	39 / 34–41	37 / 33–39	33 / 30–35	26 / 24–28	19 / 16–21	13 / 11–15
Night °C	3 / 1–4	4 / 2–6	8 / 5–9	11 / 9–14	17 / 14–19	22 / 19–24	25 / 22–28	25 / 21–27	20 / 18–22	14 / 11–16	7 / 5–9	3 / 1–5
Rain mm	21 / 16–28	27 / 22–32	20 / 14–26	8 / 6–11	4 / 3–7	3 / 2–5	13 / 9–31	16 / 11–38	10 / 7–21	13 / 10–21	12 / 10–18	19 / 15–26
DLI	20 / 19–23	26 / 25–29	37 / 35–38	46 / 45–48	52 / 51–53	55 / 54–55	51 / 49–51	46 / 44–47	40 / 39–41	31 / 30–33	22 / 21–25	18 / 17–20
RH %	48 / 46–50	46 / 45–49	43 / 41–45	38 / 36–40	35 / 33–37	33 / 31–35	37 / 35–43	39 / 37–46	39 / 37–43	40 / 39–44	44 / 42–46	47 / 45–50

Each figure is the median across the 156 grid cells holding the 557 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 1080:1298 (35.975, -115.075). Over 44 years there: absolute minimum -9.7 °C, 1st-percentile night -4.1 °C, 99th-percentile day 43.8 °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 156 distinct grid cells holding the 557 in-range records; extremes and elevation at the typical cell 1080:1298 (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 36.00_-115.000, lapse-corrected +122 m at 6.5 °C/km. Elevation: ETOPO 2022, 847 m (cell mean).

Natural habitat

Native range as published by WCVP; the marker is where the records are densest and decides nothing: the climate was read across every in-range record's cell, not at the marker.

Openly licensed records inside the range, framed on where they fall.

NativeArizona, California, Nevada, Utah, Mexico Northwest

Kew's description“succulent subshrub” · “desert or dry shrubland”· quoted from WCVP, RBG Kew (CC BY 4.0); not derived here

Map marker36.228, -114.587 · in the densest population, 795 records (54% of those in range)

Evidence usedThe map marker and the climate envelope rest on all 1466 georeferenced records inside the native range; the map shows only the 752 openly licensed ones, which alone would put the marker 607 km away. 1 record outside the range (gardens, roadsides, misidentifications) ignored. 909 in-range records are placed to worse than 10 km and stay on the map but off the climate.

The map markerthe map marker: the openly licensed record nearest the middle of the densest 1° population of the 1466 in-range records; it decides nothing.

Photographs

Photographs: CK2AZ, CC BY, iNaturalist via GBIF (8).

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 Sclerocactus johnsonii, most cited first, from OpenAlex (CC0). A mention, not a cultivation source: nothing on this page is drawn from them.

Occurrence Download