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Geranium seemannii; photograph (c) Alexis López Hernández, some rights reserved (CC BY) CC BY(c) Alexis López Hernández, some rights reserved (CC BY) · observed growing wild · 2013-02-23

Geranium seemannii Peyr.

Seemann's geranium

Geraniaceae · Texas, Mexico Central +12

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Geranium seemannii, photograph (c) Neptalí Ramírez Marcial, some rights reserved (CC BY)Geranium seemannii, photograph (c) Neptalí Ramírez Marcial, some rights reserved (CC BY)Geranium seemannii, photograph (c) Juan Cruzado Cortés, some rights reserved (CC BY)Geranium seemannii, photograph (c) Brandon Corder, some rights reserved (CC BY)Geranium seemannii, photograph (c) Alexis López Hernández, some rights reserved (CC BY)Geranium seemannii, photograph (c) Alexis López Hernández, some rights reserved (CC BY) 63 photographs ›
Habitat figures
Cold floor (1 night in 100)
0.9°C
Record low -4.1 °C in 44 years, at a typical spot in the range NASA POWER
Warmest month, mean daily high
23°C
Apr and May at the habitat CHELSA
Rain a year (median across the range)
1,124mm
7 months of 25 mm or more in the median year CHELSA
Open-sky light
30–45DLI
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 June to September, read as a summer growing season. rain rule, CHELSA
Northern hemisphere unless you set your site. The chart is in the habitat's months.

About the genus · Geranium

Geranium is a genus of 422 species of annual, biennial, and perennial plants that are commonly known as geraniums, hardy geraniums, or cranesbills. They are found throughout the temperate regions of the world and the mountains of the tropics, with the greatest diversity in the eastern part of the Mediterranean region.

Quoted from Wikipedia, "Geranium", CC BY-SA 4.0.

Cultivation

Seasons

The rain rule reads a summer growing season: 70% of the median year's rain (807 mm of 1,092 mm) falls in June to September, warmer than the year (wet-season mean 16.0 °C against a yearly mean of 14.5 °C). Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: December to March.

Rain

1,092 mm in the median year at the habitat, 807 mm of it June to September. Wettest month July at 215 mm, driest month December at 13 mm. Across the grid cells of the range the year's total runs 590 mm to 1,929 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 1,124 mm, is the year's rain at the top of the page; the 1,092 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: 30 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 24, the highest 90th-percentile month 48).

Warmth and air
Temperature

Coldest: the 1st-percentile night over 44 years at a typical spot in the range is 0.9 °C, the absolute minimum -4.1 °C, 82 frost nights in 44 years, 1.9 a year (NASA POWER daily minima). Warmest: the 99th-percentile day is 30.9 °C. Monthly means: the coldest month's mean nightly low 5.3 °C in January (across the grid cells of the range 1.0 °C to 10.6 °C), the warmest month's mean daily high 22.9 °C in May (median year across the grid cells of the range, CHELSA). Cold floor: 0.9 °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: 50 to 67% 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 -269 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

Habitat climate of Geranium seemannii through the yearWarmest months April and May, mean daily high 23 °C; coldest month January, mean nightly low 5.3 °C; 1,092 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.-10°0°10°20°30°40°frost30.9° 99th-percentile day, NASA POWER-4.1° lowest night in 44 years, NASA POWER°C · day and nightcold quarter0100200300400mm rainDLI 30–45RH 50–67%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 746 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 °C18 / 13–2119 / 15–2321 / 17–2623 / 19–2823 / 19–2821 / 17–2720 / 16–2520 / 17–2520 / 16–2419 / 16–2419 / 15–2318 / 14–22
Night °C5 / 1–116 / 2–117 / 3–129 / 5–1410 / 7–1611 / 8–1711 / 7–1611 / 7–1611 / 7–169 / 6–157 / 3–136 / 2–11
Rain mm23 / 10–5917 / 10–5016 / 7–5433 / 10–8174 / 32–169186 / 83–346215 / 101–343208 / 96–332198 / 101–36287 / 45–20922 / 12–8913 / 7–58
DLI31 / 25–3437 / 30–3943 / 36–4545 / 39–4843 / 38–4738 / 32–4337 / 32–4236 / 32–4032 / 29–3632 / 28–3531 / 26–3430 / 24–32
RH %54 / 50–6452 / 48–6250 / 45–6151 / 45–6256 / 49–6563 / 57–6965 / 59–6965 / 59–6967 / 61–7163 / 57–6958 / 52–6755 / 51–65
How this section is made
Each figure is the median across the 746 grid cells on land that hold in-range records (1193 records in those cells; 1 more cell holds records but no land by the elevation layer, so those records sit at sea and the cell is 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 1409:1623 (19.525, -98.825). Over 44 years there: absolute minimum -4.1 °C, 1st-percentile night 0.9 °C, 99th-percentile day 30.9 °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 746 distinct grid cells holding 1193 of the 1194 in-range records (1 further cell with records at sea, by the elevation layer, left out); extremes and elevation at the typical cell 1409:1623 (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 19.50_-98.750, lapse-corrected -269 m at 6.5 °C/km. Elevation: ETOPO 2022, 2364 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.
NativeTexas, Mexico Central, Mexico Northeast, Mexico Gulf, Mexico Northwest, Mexico Southwest, Mexico Southeast, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama, Peru · introduced: Ecuador · 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 marker19.32, -98.85 · in the densest population, 655 records (42% of those in range)
Kew's description“perennial” · “subtropical” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 1548 georeferenced records inside the native range; the climate across the range on the 1193 of them in the land cells it reads, of 1194 placed to within 10 km; the map shows only the 1203 openly licensed ones, which alone would put the marker 16 km away. 9 records outside the WCVP native range not used. 354 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 1548 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Geranium seemannii, photograph 1did not loadGeranium seemannii, photograph 2did not loadGeranium seemannii, photograph 3did not loadGeranium seemannii, photograph 4did not loadGeranium seemannii, photograph 5did not loadGeranium seemannii, photograph 6did not load

Photographs: (c) Neptalí Ramírez Marcial, some rights reserved (CC BY) (2); (c) Juan Cruzado Cortés, some rights reserved (CC BY); (c) Brandon Corder, some rights reserved (CC BY); (c) Alexis López Hernández, some rights reserved (CC BY) (2).

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

Hesperocyparis lusitanica Cupressaceae Quercus crassifolia Quercus crassifolia Leather Leaf Mexican Oak Photo: CC BY, Neptalí Ramírez MarcialPinus montezumae Pinus montezumae Montezuma pine Photo: CC BY, Cody HinchliffQuercus laurina Quercus laurina Fagaceae Photo: CC BY, Neptalí Ramírez MarcialErythranthe glabrata Erythranthe glabrata Round-leaved monkeyflower Photo: CC BY, avephillCeanothus caeruleus Ceanothus caeruleus Rhamnaceae Photo: CC BY, Neptalí Ramírez Marcial

Other Geranium 106 in the reference

Geranium albanum Geranium albanum Geraniaceae Photo: CC BY-SA, Tom RiggleGeranium albiflorum Geranium albiflorum Geraniaceae Photo: CC BY, Alexander DubyninGeranium alboroseum Geranium alboroseum Geraniaceae Photo: CC BY, Thomas GyselinckGeranium argenteum Geranium argenteum Geraniaceae Photo: CC BY, Elias Geranium aristatum Geraniaceae Geranium asphodeloides Geranium asphodeloides Geraniaceae Photo: CC BY, Milan ChytrýGeranium bicknellii Geranium bicknellii Bicknell's cranesbill Photo: CC BY, Patrick JacksonGeranium bohemicum Geranium bohemicum Geraniaceae Photo: CC BY, Tatyana SovaGeranium brevicaule Geranium brevicaule Alpine Crane's Bill Photo: CC BY, Felix CollinsGeranium caespitosum Geranium caespitosum Pineywoods geranium Photo: CC0, author not statedGeranium carolinianum Geranium carolinianum Carolina crane's-bill Photo: CC0, author not statedGeranium cataractarum Geranium cataractarum Geraniaceae Photo: CC BY, Rafael Medina all 107 ›

Names & registers

Also known as Geranium mexicanum var. macranthum; Geranium seemannii var. macranthum. (GBIF Backbone)

GBIFPOWOIPNIWFOWikidataiNaturalist

The record

Family
Geraniaceae
Described by
Peyr.
Native to
Texas, Mexico Central, Mexico Northeast +11
Wild records
1548 in range · 1203 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
GBIF species record gbif.species answeredasked 2026-10-22
GBIF synonyms gbif.synonyms answeredasked 2026-10-22
GBIF common names gbif.vernacular answeredasked 2026-10-22names fetched 2026-10-22
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; 19 records within 1 km of a botanic garden, herbarium or zoo left out (6 at a botanic garden or arboretum, 9 at a herbarium, 4 at a zoo; Wikidata's list)
Habitat climate climate answeredasked 2026-10-22
Daily extremes (NASA POWER) climate.extremes answeredasked 2026-10-22NASA POWER (MERRA-2) daily 1981–2024, cell 19.50_-98.750, lapse-corrected -269 m at 6.5 °C/km
Wikidata wikidata answeredasked 2026-10-22
Wikipedia wikipedia nothing to reportasked 2026-10-22
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 2026-10-22
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 85 datasets via GBIF.org; each carries its own licence.

Cultifolio

Opening your plants…