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Amaranthus pumilus; photograph (c) Sean Rigney, some rights reserved (CC BY) CC BY(c) Sean Rigney, some rights reserved (CC BY) · observed growing wild · 2020-09-14

Amaranthus pumilus Raf.

Coast amaranth; Seabeach amaranthus; Seabeach pigweed; Seaside amaranth

Amaranthaceae · Connecticut, New York +6

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Amaranthus pumilus, photograph author not stated, no rights reservedAmaranthus pumilus, photograph (c) Sean Rigney, some rights reserved (CC BY)Amaranthus pumilus, photograph (c) Sean Rigney, some rights reserved (CC BY)Amaranthus pumilus, photograph (c) Sean Rigney, some rights reserved (CC BY)Amaranthus pumilus, photograph author not stated, no rights reservedAmaranthus pumilus, photograph (c) harrier, some rights reserved (CC BY) 63 photographs ›
Habitat figuresfrom few records
Cold floor (1 night in 100)
-12.1°C
Record low -19.8 °C in 44 years, at a typical spot in the range NASA POWER
Warmest month, mean daily high
25°C
Jul and Aug at the habitat CHELSA
Rain a year (median across the range)
1,210mm
12 months of 25 mm or more in the median year CHELSA
Open-sky light
11–40DLI
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
Rain spread: 70% of the median year's rain takes 9 months, so no short rainy season. rain rule, CHELSA
Northern hemisphere unless you set your site. The chart is in the habitat's months.

From few records: 8 records in 8 grid cells. The records.

Summary

Amaranthus pumilus, the seaside amaranth or seabeach amaranth, is a species of amaranth. This annual plant is now a threatened species, although it was formerly scattered along the eastern coast of the United States, its native range.

Quoted from Wikipedia, "Amaranthus pumilus", CC BY-SA 4.0.

Cultivation

Seasons

The rain rule reads no short rainy season: 70% of the median year's rain (931 mm of 1,196 mm) takes 9 months, March to June and August to December. Mean temperature moves 22.3 °C between the warmest and coldest month. Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: February to June and September to December.

Rain

1,196 mm in the median year at the habitat, 931 mm of it March to June and August to December. Wettest month March at 115 mm, driest month February at 85 mm. Across the grid cells of the range the year's total runs 1,164 mm to 1,267 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 1,210 mm, is the year's rain at the top of the page; the 1,196 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: 11 to 40 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 11, the highest 90th-percentile month 42).

Warmth and air
Temperature

Coldest: the 1st-percentile night over 44 years at a typical spot in the range is -12.1 °C, the absolute minimum -19.8 °C, 3,845 frost nights in 44 years, 87.4 a year (NASA POWER daily minima). Warmest: the 99th-percentile day is 29.9 °C. Monthly means: the coldest month's mean nightly low -2.1 °C in January (across the grid cells of the range -3.2 °C to -1.1 °C), the warmest month's mean daily high 24.9 °C in July (median year across the grid cells of the range, CHELSA). Cold floor: -12.1 °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: 57 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 -7 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

From few records: this habitat climate is read from 8 records in 8 grid cells; a page says so under 12 records or 5 cells, and shows the figures as read.

Habitat months, northern hemisphere

Habitat climate of Amaranthus pumilus through the yearWarmest months July and August, mean daily high 25 °C; coldest month January, mean nightly low -2.1 °C; 1,196 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, northern hemisphere.-30°-20°-10°0°10°20°30°40°frost29.9° 99th-percentile day, NASA POWER-19.8° lowest night in 44 years, NASA POWER°C · day and nightcold quarter0255075100125150mm rainDLI 11–40RH 57–64%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 8 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 °C4 / 3–44 / 4–57 / 6–911 / 9–1516 / 14–2022 / 19–2525 / 22–2825 / 23–2722 / 20–2316 / 16–1712 / 11–127 / 6–7
Night °C-2 / -3–-1-2 / -3–-12 / 1–26 / 6–711 / 10–1217 / 16–1821 / 19–2121 / 19–2118 / 16–1812 / 11–137 / 6–81 / 0–2
Rain mm89 / 85–9385 / 76–92115 / 105–128112 / 105–11995 / 91–107100 / 96–10791 / 88–120100 / 96–10999 / 92–110103 / 100–10799 / 94–117108 / 101–114
DLI13 / 13–1420 / 19–2026 / 26–2733 / 32–3437 / 37–3940 / 39–4239 / 38–4135 / 34–3728 / 27–2921 / 20–2114 / 14–1411 / 11–12
RH %58 / 57–5857 / 55–5758 / 56–5859 / 56–6061 / 58–6263 / 59–6463 / 58–6564 / 60–6561 / 59–6359 / 58–6058 / 58–5957 / 57–58
How this section is made
Each figure is the median across the 8 grid cells on land that hold in-range records (8 records in those cells; 2 more cells hold records but no land by the elevation layer, so those records sit at sea and the cells are left out), 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 970:2174 (41.475, -71.275). Over 44 years there: absolute minimum -19.8 °C, 1st-percentile night -12.1 °C, 99th-percentile day 29.9 °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 8 distinct grid cells holding 8 of the 10 in-range records (2 further cells with records at sea, by the elevation layer, left out); extremes and elevation at the typical cell 970:2174 (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 41.50_-71.250, lapse-corrected -7 m at 6.5 °C/km. Elevation: ETOPO 2022, 10 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.
NativeConnecticut, New York, Pennsylvania, Rhode I., Delaware, Maryland, North Carolina, South Carolina · 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 marker40.537, -73.461 · in the densest population, 113 records (64% of those in range)
Extinct inMassachusetts, New Jersey, Virginia · recorded as extinct by WCVP: history, not habitat; no records are tested against these regions
Kew's description“annual” · “temperate” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 177 georeferenced records inside the native range; the climate across the range on the 8 of them in the land cells it reads, of 10 placed to within 10 km; the map shows only the 43 openly licensed ones, which alone would put the marker 7 km away. 89 records outside the WCVP native range not used. Under a dozen records behind the climate. 167 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.
How this section is made
The map marker: the openly licensed record nearest the middle of the densest 1° population of the 177 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Amaranthus pumilus, photograph 1did not loadAmaranthus pumilus, photograph 2did not loadAmaranthus pumilus, photograph 3did not loadAmaranthus pumilus, photograph 4did not loadAmaranthus pumilus, photograph 5did not loadAmaranthus pumilus, photograph 6did not load

Photographs: author not stated, no rights reserved · CC0 (2); (c) Sean Rigney, some rights reserved (CC BY) (3); (c) harrier, some rights reserved (CC BY).

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

Pityopsis falcata Pityopsis falcata Sickleleaf silkgrass Photo: CC BY, Bonnie SemmlingPrunus maritima Prunus maritima Beach plum Photo: CC BY, Jonathan LaymanHypericum adpressum Hypericum adpressum Creeping St. Johnswort Photo: CC BY, Ryan SorrellsCoreopsis rosea Coreopsis rosea Pink tickseed Photo: CC BY, Bob SchwartzSabatia kennedyana Sabatia kennedyana Plymouth rose gentian Photo: CC BY-SA, bobkennedySalicornia virginica Salicornia virginica Virginia glasswort Photo: CC BY, Justin Quintanilla

Other Amaranthus 23 in the reference

Amaranthus albus Amaranthus albus White pigweed Photo: CC0, author not statedAmaranthus australis Amaranthus australis Southern amaranth Photo: CC0, author not statedAmaranthus blitoides Amaranthus blitoides Prostrate pigweed Photo: CC BY, Tatyana SovaAmaranthus blitum Amaranthus blitum Purple amaranth Photo: CC BY, Jason GrantAmaranthus caudatus Amaranthus caudatus Love-lies-bleeding Photo: CC BY, Evgenij SamarinAmaranthus cruentus Amaranthus cruentus Purple amaranth Photo: CC0, author not statedAmaranthus deflexus Amaranthus deflexus Perennial pigweed Photo: CC BY-SA, Pere BarnolaAmaranthus dubius Amaranthus dubius Spleen Amaranth Photo: CC BY, scallionsAmaranthus fimbriatus Amaranthus fimbriatus Amaranthaceae Photo: CC BY, Jo Roberts Amaranthus floridanus Florida amaranth Amaranthus graecizans Amaranthus graecizans Mediterranean amaranth Photo: CC BY, Michael AndresekAmaranthus hybridus Amaranthus hybridus Green amaranth Photo: CC BY, zebedeugalinha all 24 ›

Names & registers

Also known as Euxolus pumilus. (GBIF Backbone)

GBIFPOWOIPNIWFOWikidataWikipediaiNaturalist

The record

Family
Amaranthaceae
Described by
Raf.
Native to
Connecticut, New York, Pennsylvania +5
Wild records
177 in range · 43 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 2026-10-21
GBIF species record gbif.species answeredasked 2026-10-21
GBIF synonyms gbif.synonyms answeredasked 2026-10-21
GBIF common names gbif.vernacular answeredasked 2026-10-21names fetched 2026-10-21
WCVP native range wcvp.distribution answeredas of 2026-06-04
GBIF occurrence records gbif.occurrences answeredas of 2026-10-21GBIF occurrence download https://doi.org/10.15468/dl.hbdw64, of 2026-10-21
Habitat climate climate answeredasked 2026-10-21
Daily extremes (NASA POWER) climate.extremes answeredasked 2026-10-21NASA POWER (MERRA-2) daily 1981–2024, cell 41.50_-71.250, lapse-corrected -7 m at 6.5 °C/km
Wikidata wikidata answeredasked 2026-10-21
Wikipedia wikipedia answeredasked 2026-10-21
iNaturalist photographs, wild inat.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 2026-10-22
iNaturalist photographs, cultivated inat.photos.cultivated not asked
GBIF media gbif.media answeredasked 2026-10-21
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 6 datasets via GBIF.org; each carries its own licence.

Cultifolio

Opening your plants…