Psorodendron fremontii (Torr. ex A.Gray) Rydb.
English names not checked: Wikidata's common names were not read for this page.
Photographs not checked
iNaturalist and GBIF media were skipped (not asked) when this page was built. Not asked, or not answered, is not "none": nothing here claims there is none. Why the site says it this way.At a glance
- Jan, shaded
- Feb, shaded
- Mar, shaded
- Apr
- May
- Jun, under 5 mm of rain
- Jul
- Aug, shaded
- Sep
- Oct, shaded
- Nov, shaded
- Dec, shaded
Summary
Psorodendron fremontii, the Fremont's dalea or Fremont's indigo bush (after John C. Frémont) is a perennial legume shrub.
Quoted from Wikipedia, "Psorodendron fremontii", CC BY-SA 4.0.
Cultivation
Seasons
The rain rule reads a winter growing season: 70% of the median year's rain (143 mm of 189 mm) falls in October to March and August, cooler than the year (wet-season mean 12.9 °C against a yearly mean of 17.6 °C). Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: February and April to September.
Rain
189 mm in the median year at the habitat, 143 mm of it October to March and August. Wettest month February at 29 mm, driest month June at 4 mm; 1 month under 5 mm. Across the grid cells of the range the year's total runs 131 mm to 306 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 193 mm, is the year's rain at the top of the page; the 189 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: 18 to 55 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 17, the highest 90th-percentile month 55).
Warmth and air
Coldest: the 1st-percentile night over 44 years at a typical spot in the range is -4.7 °C, the absolute minimum -13.2 °C, 2,312 frost nights in 44 years, 52.5 a year (NASA POWER daily minima). Warmest: the 99th-percentile day is 40.5 °C. Monthly means: the coldest month's mean nightly low 0.9 °C in January (across the grid cells of the range -4.0 °C to 4.4 °C), the warmest month's mean daily high 36.2 °C in July (median year across the grid cells of the range, CHELSA). Cold floor: -4.7 °C, which is the 1st-percentile night over 44 years at a typical spot in the range (NASA POWER).
Relative humidity at the habitat: 35 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 -58 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, northern hemisphere
Mean daily high from 11 °C in Dec to 36 °C in Jul; mean nightly low from 1 °C in Jan and Dec to 23 °C in Jul. The cold quarter, Nov to Jan, is the three months around the coldest month's mean nightly low, centred on the 2 months in a row that tie for it. 189 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 289 habitat cells. Over 44 years at a typical spot in the range (NASA POWER) the absolute minimum was -13.2 °C and the 99th-percentile day 40.5 °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 | 12 / 6–15 | 14 / 9–18 | 18 / 13–22 | 23 / 18–27 | 28 / 24–33 | 34 / 29–38 | 36 / 32–40 | 35 / 31–39 | 31 / 27–35 | 24 / 20–28 | 17 / 13–20 | 11 / 7–15 |
| Night °C | 1 / -4–4 | 2 / -2–6 | 5 / 1–9 | 9 / 5–13 | 14 / 10–19 | 19 / 15–24 | 23 / 19–27 | 22 / 18–27 | 18 / 14–22 | 11 / 8–15 | 5 / 1–9 | 1 / -4–5 |
| Rain mm | 24 / 16–38 | 29 / 20–45 | 23 / 15–40 | 10 / 6–22 | 6 / 3–13 | 4 / 1–7 | 13 / 7–24 | 17 / 9–28 | 13 / 7–21 | 15 / 8–26 | 14 / 10–25 | 21 / 14–34 |
| DLI | 20 / 19–22 | 26 / 25–28 | 37 / 35–38 | 46 / 45–47 | 52 / 51–53 | 55 / 54–55 | 51 / 50–53 | 46 / 45–48 | 40 / 39–41 | 31 / 29–32 | 22 / 21–24 | 18 / 17–20 |
| RH % | 49 / 46–53 | 48 / 45–52 | 45 / 42–49 | 40 / 37–45 | 37 / 34–42 | 35 / 32–38 | 38 / 35–41 | 40 / 37–43 | 40 / 37–43 | 42 / 39–46 | 45 / 42–49 | 48 / 45–52 |
How this section is made
Natural habitat
This species has no GBIF key of its own. Its records are GBIF's under the key of the name Kew's World Checklist holds as this plant: 2940502 (Psorothamnus fremontii (Torr. ex A.Gray) Barneby, 958 records). No name was matched to GBIF; the keys are read from Kew's synonymy. How.
How this section is made
Photographs
Related
Similar habitat climate The 6 nearest by mean daily high, mean nightly low and rain, month by month. How.
Encelia virginensis Virgin River brittlebush Photo: CC BY, CK2AZ
Penstemon bicolor Pinto beardtongue Photo: CC BY-SA, Stan Shebs
Mortonia utahensis Celastraceae Photo: CC BY, Kenzie Anderson-Bell
Brickellia atractyloides Spearleaf brickellbush Photo: CC BY, Trevor Van Loon
Eriogonum deflexum Skeleton-weed Photo: CC BY, CK2AZ
Xylorhiza tortifolia Mojave woodyaster Photo: CC0, author not statedOther Psorodendron 3 in the reference
Names & registers
Also known as Dalea johnsonii; Parosela johnsonii; Dalea fremontii var. johnsonii; Parosela fremontii; Dalea fremontii and 5 more. (WCVP, RBG Kew)
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
kew.names answeredas of 2026-06-04Kew's entry Psorodendron fremontii (Torr. ex A.Gray) Rydb. (plant_name_id 2535553), read from Kew's names filegbif.species not askedGBIF's backbone holds no one accepted species of this name, and a name it holds only as another species' synonym is not taken for this one, so GBIF's records were not askedgbif.synonyms not askedGBIF's backbone holds no one accepted species of this name, and a name it holds only as another species' synonym is not taken for this one, so GBIF's records were not askedgbif.vernacular not askedGBIF's backbone holds no one accepted species of this name, and a name it holds only as another species' synonym is not taken for this one, so GBIF's records were not askedwcvp.distribution answeredas of 2026-06-04gbif.occurrences answeredas of 2026-10-21this species has no GBIF key of its own; its records are read under GBIF's keys for the names Kew's file holds as this plant, never by a name matched; GBIF occurrence download https://doi.org/10.15468/dl.hbdw64, of 2026-10-21; 958 records of GBIF's key 2940502, Psorothamnus fremontii (Torr. ex A.Gray) Barneby (Kew's file holds it as Psorothamnus fremontii (Torr. ex A.Gray) Barneby (synonym under Psorodendron fremontii (Torr. ex A.Gray) Rydb.)): the GBIF download; 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 2026-10-22climate.extremes answeredasked 2026-10-22NASA POWER (MERRA-2) daily 1981–2024, cell 36.00_-115.625, lapse-corrected -58 m at 6.5 °C/kmwikidata answeredasked 2026-10-22found by Kew's IPNI identifier 212349-2, POWO 212349-2wikipedia answeredasked 2026-10-22inat.photos.wild not askedinat.photos.cultivated not askedgbif.media not askedGBIF's backbone holds no one accepted species of this name, and a name it holds only as another species' synonym is not taken for this one, so GBIF's records were not askedcommons nothing to reportasked 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 50 datasets via GBIF.org; each carries its own licence.