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Poikilacanthus tweedieanus (Nees) Lindau

Acanthaceae · Bolivia, Argentina Northeast +2

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.
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Habitat figures
Cold floor (1 night in 100)
-2.3°C
Record low -9.5 °C in 44 years, at a typical spot in the range NASA POWER
Warmest month, mean daily high
27°C
Jan at the habitat CHELSA
Rain a year (median across the range)
934mm
8 months of 25 mm or more in the median year CHELSA
Open-sky light
19–45DLI
Lowest to highest month (DLI) CHELSA
The year in your months, northern hemisphere
  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May
  6. Jun
  7. Jul
  8. Aug
  9. Sep
  10. Oct
  11. Nov
  12. Dec
Wet summers: the rain comes May to September (November to March at the habitat), read as a summer growing season. rain rule, CHELSA
Northern hemisphere unless you set your site. The chart is in the habitat's months.

Cultivation

Seasons

The rain rule reads a summer growing season: 70% of the median year's rain (627 mm of 828 mm) falls in November to March, warmer than the year (wet-season mean 21.1 °C against a yearly mean of 16.2 °C). Months are the habitat's, southern hemisphere; shifted six months for a northern-hemisphere collection: May to September.

Rain

828 mm in the median year at the habitat, 627 mm of it November to March. Wettest month January at 134 mm, driest month June at 9 mm. Across the grid cells of the range the year's total runs 497 mm to 1,193 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 934 mm, is the year's rain at the top of the page; the 828 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: 19 to 45 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 15, the highest 90th-percentile month 47).

Warmth and air
Temperature

Coldest: the 1st-percentile night over 44 years at a typical spot in the range is -2.3 °C, the absolute minimum -9.5 °C, 785 frost nights in 44 years, 17.8 a year (NASA POWER daily minima). Warmest: the 99th-percentile day is 35.9 °C. Monthly means: the coldest month's mean nightly low 4.3 °C in July (across the grid cells of the range 0.1 °C to 7.2 °C), the warmest month's mean daily high 27.3 °C in January (median year across the grid cells of the range, CHELSA). Cold floor: -2.3 °C, which is the 1st-percentile night over 44 years at a typical spot in the range (NASA POWER).

Humidity

Relative humidity at the habitat: 54 to 59% 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 -233 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

Habitat climate of Poikilacanthus tweedieanus through the yearWarmest month January, mean daily high 27 °C; coldest month July, mean nightly low 4.3 °C; 828 mm of rain in the median year (the twelve monthly medians added). Medians across the range, from CHELSA; the extremes at the edge from NASA POWER. Habitat months, southern hemisphere.-20°-10°0°10°20°30°40°frost35.9° 99th-percentile day, NASA POWER-9.5° lowest night in 44 years, NASA POWER°C · day and nightcold quarter050100150200250mm rainDLI 19–45RH 54–59%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 44 habitat cells, CHELSA cold quarter: the three months around the coldest month's mean nightly low extremes over 44 years at a typical spot in the range, from NASA POWER, marked at the edge, in no month DLI, mol/m²/dayRH %each on its own scale
Figures by month
JanFebMarAprMayJunJulAugSepOctNovDec
Day °C27 / 18–3026 / 17–2924 / 17–2721 / 16–2318 / 14–1916 / 13–1715 / 13–1618 / 15–1919 / 15–2122 / 17–2425 / 17–2726 / 18–29
Night °C18 / 9–2017 / 8–1916 / 8–1812 / 6–148 / 3–115 / 1–84 / 0–76 / 2–98 / 3–1012 / 6–1414 / 7–1617 / 8–19
Rain mm134 / 111–237128 / 89–188130 / 63–15754 / 22–11224 / 9–809 / 3–4613 / 5–4612 / 5–4428 / 8–6261 / 19–123109 / 42–133126 / 85–205
DLI44 / 38–4639 / 35–4232 / 29–3625 / 23–3320 / 18–2919 / 15–2721 / 16–2927 / 22–3533 / 29–4138 / 36–4443 / 40–4645 / 40–47
RH %57 / 54–6958 / 55–6959 / 57–7059 / 56–6859 / 49–6458 / 43–6156 / 42–6054 / 46–5854 / 49–5756 / 51–6056 / 52–6455 / 53–67
How this section is made
Each figure is the median across the 44 grid cells holding the 57 in-range records, with the 10th–90th percentile span across those cells after the slash where it differs. A dash is a month one or more of those cells has no figure for in the grid (a variable CHELSA does not carry there), so no median is taken rather than one over fewer cells. Extremes and elevation were read at a typical spot in the range, cell 2449:2299 (-32.475, -65.025). Over 44 years there: absolute minimum -9.5 °C, 1st-percentile night -2.3 °C, 99th-percentile day 35.9 °C. Normals: CHELSA V2.1 1981–2010 climatology, 0.05° cells (each the mean of ~36 1 km pixels). Across the range: median and 10th–90th percentile of each month across the 44 distinct grid cells holding 57 of the 57 in-range records; extremes and elevation at the typical cell 2449:2299 (its coldest month's mean nightly low nearest the median across cells); its position is the cell centre. Extremes: NASA POWER (MERRA-2) daily 1981–2024, cell -32.50_-65.000, lapse-corrected -233 m at 6.5 °C/km. Elevation: ETOPO 2022, 851 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 the cells of the in-range records placed well enough to read one, not at the marker.
Openly licensed records inside the range, framed on where they fall.

This species has no GBIF key of its own. Its records are GBIF's under the keys of the names Kew's World Checklist holds as this plant: 4938648 (Justicia tweedieana (Nees) Griseb., 18 records), 4938649 (Adhatoda tweedieana Nees, 0 records), 5575637 (Ecbolium tweedieanum (Nees) Kuntze, 0 records), 10758029 (Justicia tweedieana (Nees) Benth. & Hook.f., 2 records), 10804479 (Poikilacanthus tweedieanus (Nees) Lindau, 65 records). No name was matched to GBIF; the keys are read from Kew's synonymy. How.

NativeBolivia, Argentina Northeast, Argentina Northwest, Uruguay · regions are the level-3 units of the World Geographical Scheme for Recording Plant Distributions, as Kew's World Checklist records ranges, some under historical names such as Yugoslavia or Czechoslovakia (how).
Map marker-28.333, -65.921 · in the densest population, 57 records (77% of those in range)
Kew's description“subshrub or shrub” · “seasonally dry tropical” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 74 georeferenced records inside the native range; the climate across the range on the 57 of them placed to within 10 km; the map shows only the 36 openly licensed ones, which alone would put the marker 767 km away. 17 in-range records are placed to worse than 10 km, or with no stated accuracy (admitted only as a person's observation to three decimals), and stay on the map but off the climate.
Other GBIF keysRecords also from GBIF's key 4938648 (Justicia tweedieana (Nees) Griseb.): Kew's file holds it as Justicia tweedieana (Nees) Griseb. (synonym under Poikilacanthus tweedieanus (Nees) Lindau); 18 records, from GBIF's download.Records also from GBIF's key 4938649 (Adhatoda tweedieana Nees): Kew's file holds it as Adhatoda tweedieana Nees (synonym under Poikilacanthus tweedieanus (Nees) Lindau); 0 records, from GBIF's search API on the day of the build.Records also from GBIF's key 5575637 (Ecbolium tweedieanum (Nees) Kuntze): Kew's file holds it as Ecbolium tweedieanum (Nees) Kuntze (synonym under Poikilacanthus tweedieanus (Nees) Lindau); 0 records, from GBIF's search API on the day of the build.Records also from GBIF's key 10758029 (Justicia tweedieana (Nees) Benth. & Hook.f.): Kew's file holds it as Justicia tweedieana (Nees) Griseb. (synonym under Poikilacanthus tweedieanus (Nees) Lindau); 2 records, from GBIF's download.Records also from GBIF's key 10804479 (Poikilacanthus tweedieanus (Nees) Lindau): Kew's file holds it as Poikilacanthus tweedieanus (Nees) Lindau (accepted); 65 records, from GBIF's download.
How this section is made
The map marker: the openly licensed record nearest the middle of the densest 1° population inside the densest 4° block of the 74 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Not checked. iNaturalist and GBIF media were skipped (not asked) when this page was built. Not a statement that none exist.

Similar habitat climate The 6 nearest by mean daily high, mean nightly low and rain, month by month. How.

Ruprechtia apetala Ruprechtia apetala Polygonaceae Photo: CC BY, Marcos GramagliaLippia turbinata Lippia turbinata Verbenaceae Photo: CC BY, Luis Martin StivanelloDyckia floribunda Dyckia floribunda Bromeliaceae Photo: CC BY, Tomás Carranza PeralesGymnocalycium quehlianum Gymnocalycium quehlianum Cactaceae Photo: CC BY, Lucas CarboneBougainvillea stipitata Bougainvillea stipitata Nyctaginaceae Photo: CC BY, Federico ActisEchinopsis aurea Echinopsis aurea Cactaceae Photo: CC0, author not stated

Names & registers

Also known as Adhatoda tweedieana var. angustifolia; Justicia viridis; Justicia tweedieana; Justicia diamantina; Justicia campestris and 5 more. (WCVP, RBG Kew)

IPNIPOWO

The record

Family
Acanthaceae
Described by
(Nees) Lindau
Native to
Bolivia, Argentina Northeast, Argentina Northwest +1
Wild records
74 in range · 36 open

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's names (WCVP) kew.names answeredas of 2026-06-04Kew's entry Poikilacanthus tweedieanus (Nees) Lindau (plant_name_id 2406597), read from Kew's names file
GBIF species record gbif.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 asked
GBIF synonyms gbif.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 asked
GBIF common names gbif.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 asked
WCVP native range wcvp.distribution answeredas of 2026-06-04
GBIF occurrence records gbif.occurrences answeredasked 2026-10-22this 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; 18 records of GBIF's key 4938648, Justicia tweedieana (Nees) Griseb. (Kew's file holds it as Justicia tweedieana (Nees) Griseb. (synonym under Poikilacanthus tweedieanus (Nees) Lindau)): the GBIF download; 0 records of GBIF's key 4938649, Adhatoda tweedieana Nees (Kew's file holds it as Adhatoda tweedieana Nees (synonym under Poikilacanthus tweedieanus (Nees) Lindau)): GBIF occurrence search API; 0 records of GBIF's key 5575637, Ecbolium tweedieanum (Nees) Kuntze (Kew's file holds it as Ecbolium tweedieanum (Nees) Kuntze (synonym under Poikilacanthus tweedieanus (Nees) Lindau)): GBIF occurrence search API; 2 records of GBIF's key 10758029, Justicia tweedieana (Nees) Benth. & Hook.f. (Kew's file holds it as Justicia tweedieana (Nees) Griseb. (synonym under Poikilacanthus tweedieanus (Nees) Lindau)): the GBIF download; 65 records of GBIF's key 10804479, Poikilacanthus tweedieanus (Nees) Lindau (Kew's file holds it as Poikilacanthus tweedieanus (Nees) Lindau (accepted)): the GBIF download
Habitat climate climate answeredasked 2026-10-22
Daily extremes (NASA POWER) climate.extremes answeredasked 2026-10-22NASA POWER (MERRA-2) daily 1981–2024, cell -32.50_-65.000, lapse-corrected -233 m at 6.5 °C/km
Wikidata wikidata nothing to reportasked 2026-10-22no item carries Kew's IPNI identifier 204841-2, POWO 204841-2
Wikipedia wikipedia nothing to reportasked 2026-10-22
iNaturalist taxon inat.taxon not asked
iNaturalist photographs, wild inat.photos.wild not asked
iNaturalist photographs, cultivated inat.photos.cultivated not asked
GBIF media gbif.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 asked
Wikimedia Commons commons nothing to reportasked 2026-10-22
OpenAlex papers openalex not askednot yet asked for this reference; a later fill takes the papers from OpenAlex's snapshot

Every 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 8 datasets via GBIF.org; each carries its own licence.

Cultifolio

Opening your plants…