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Scutellaria serrata; photograph (c) Christopher Evans, some rights reserved (CC BY) CC BY(c) Christopher Evans, some rights reserved (CC BY) · observed growing wild · 2026-05-25

Scutellaria serrata Andrews

Showy skullcap

Lamiaceae · Illinois, New York +11

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Scutellaria serrata, photograph author not stated, no rights reservedScutellaria serrata, photograph author not stated, no rights reservedScutellaria serrata, photograph author not stated, no rights reservedScutellaria serrata, photograph author not stated, no rights reservedScutellaria serrata, photograph author not stated, no rights reservedScutellaria serrata, photograph (c) Christopher Evans, some rights reserved (CC BY) 79 photographs ›
Habitat figures
Cold floor (1 night in 100)
-13.4°C
Record low -25.5 °C in 44 years, at a typical spot in the range NASA POWER
Warmest month, mean daily high
28°C
Jul and Aug at the habitat CHELSA
Rain a year (median across the range)
1,149mm
12 months of 25 mm or more in the median year CHELSA
Open-sky light
13–39DLI
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 8 months, so no short rainy season. rain rule, CHELSA
Northern hemisphere unless you set your site. The chart is in the habitat's months.

Summary

Scutellaria serrata, commonly known as showy skullcap or serrate skullcap, is a species of flowering plant in the mint family (Lamiaceae). It is a perennial herb native to the eastern United States, where it occurs in rich forests and other upland wooded habitats.

Quoted from Wikipedia, "Scutellaria serrata", CC BY-SA 4.0.

About the genus · Scutellaria

Scutellaria is a genus of flowering plants in the mint family, Lamiaceae. They are known commonly as skullcaps. The generic name is derived from the Latin scutella, meaning "a small dish, tray or platter", or "little dish", referring to the shape of the calyx. More on Wikipedia ›

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

Cultivation

Seasons

The rain rule reads no short rainy season: 70% of the median year's rain (819 mm of 1,152 mm) takes 8 months, March to September and 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: September to March and June.

Rain

1,152 mm in the median year at the habitat, 819 mm of it March to September and December. Wettest month July at 118 mm, driest month February at 80 mm. Across the grid cells of the range the year's total runs 1,034 mm to 1,385 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 1,149 mm, is the year's rain at the top of the page; the 1,152 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: 13 to 39 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 40).

Warmth and air
Temperature

Coldest: the 1st-percentile night over 44 years at a typical spot in the range is -13.4 °C, the absolute minimum -25.5 °C, 4,768 frost nights in 44 years, 108.4 a year (NASA POWER daily minima). Warmest: the 99th-percentile day is 33.8 °C. Monthly means: the coldest month's mean nightly low -3.2 °C in January (across the grid cells of the range -4.5 °C to -1.6 °C), the warmest month's mean daily high 28.2 °C in July (median year across the grid cells of the range, CHELSA). Cold floor: -13.4 °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: 55 to 61% 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 -31 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 Scutellaria serrata through the yearWarmest months July and August, mean daily high 28 °C; coldest month January, mean nightly low -3.2 °C; 1,152 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°frost33.8° 99th-percentile day, NASA POWER-25.5° lowest night in 44 years, NASA POWER°C · day and nightcold quarter0255075100125150mm rainDLI 13–39RH 55–61%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 202 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 °C6 / 4–88 / 6–1012 / 11–1418 / 16–2022 / 20–2426 / 24–2928 / 26–3128 / 25–3024 / 22–2619 / 17–2013 / 12–147 / 6–9
Night °C-3 / -5–-2-2 / -3–02 / 0–47 / 5–812 / 10–1316 / 15–1819 / 17–2118 / 16–2015 / 13–169 / 7–104 / 2–5-1 / -3–0
Rain mm84 / 70–11580 / 69–121100 / 87–12395 / 85–115114 / 99–133108 / 97–131118 / 101–14698 / 85–12397 / 77–11782 / 65–9587 / 76–10389 / 75–119
DLI15 / 13–1720 / 18–2127 / 25–2834 / 33–3537 / 36–3839 / 39–4038 / 37–3934 / 34–3528 / 28–2923 / 21–2416 / 14–1813 / 11–15
RH %58 / 56–5957 / 55–5856 / 54–5755 / 54–5758 / 56–6060 / 57–6260 / 57–6361 / 58–6360 / 58–6258 / 57–6058 / 57–5958 / 56–60
How this section is made
Each figure is the median across the 202 grid cells holding the 313 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 1056:1991 (37.175, -80.425). Over 44 years there: absolute minimum -25.5 °C, 1st-percentile night -13.4 °C, 99th-percentile day 33.8 °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 202 distinct grid cells holding 313 of the 313 in-range records; extremes and elevation at the typical cell 1056:1991 (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 37.00_-80.625, lapse-corrected -31 m at 6.5 °C/km. Elevation: ETOPO 2022, 632 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.
NativeIllinois, New York, Ohio, Pennsylvania, West Virginia, Alabama, Kentucky, Maryland, North Carolina, South Carolina, Tennessee, Virginia, District of Columbia · 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 marker38.892, -78.146 · in the densest population, 297 records (73% of those in range)
Kew's description“perennial” · “temperate” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 405 georeferenced records inside the native range; the climate across the range on the 313 of them placed to within 10 km; the map shows only the 111 openly licensed ones, which alone would put the marker 369 km away. 5 records outside the WCVP native range not used. 92 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 inside the densest 2° block of the 405 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Scutellaria serrata, photograph 1did not loadScutellaria serrata, photograph 2did not loadScutellaria serrata, photograph 3did not loadScutellaria serrata, photograph 4did not loadScutellaria serrata, photograph 5did not loadScutellaria serrata, photograph 6did not load

Photographs: author not stated, no rights reserved · CC0 (5); (c) Christopher Evans, some rights reserved (CC BY).

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

Penstemon canescens Penstemon canescens Eastern gray beardtongue Photo: CC BY, Scott CavePhlox ovata Phlox ovata Allegheny phlox Photo: CC0, author not statedAesculus flava Aesculus flava Yellow buckeye Photo: CC BY, Sandy WolkenbergOxalis grandis Oxalis grandis Great yellow woodsorrel Photo: CC BY, Terry LoebSedum ternatum Sedum ternatum Wild stonecrop Photo: CC BY, Evan M. RaskinUvularia perfoliata Uvularia perfoliata Perfoliate bellwort Photo: CC BY, Bryan Connolly

Other Scutellaria 56 in the reference

Scutellaria albida Scutellaria albida Lamiaceae Photo: CC BY, Eleftherios KatsillisScutellaria alpina Scutellaria alpina Alpine scullcap Photo: CC BY, Ben CostamagnaScutellaria altissima Scutellaria altissima Somerset skullcap Photo: CC BY, Aleksei BaushevScutellaria arenicola Scutellaria arenicola Florida scrub skullcap Photo: CC BY, Athena PhilipsScutellaria aurata Scutellaria aurata Lamiaceae Photo: CC BY-SA, Cymothoa exiguaScutellaria austrotaiwanensis Scutellaria austrotaiwanensis Lamiaceae Photo: CC BY, 槲蕨MiuScutellaria baicalensis Scutellaria baicalensis Baikal skullcap Photo: CC BY, Святослав ВласенкоScutellaria barbata Scutellaria barbata Barbed skullcap Photo: CC BY, 葉淑蓮Scutellaria brevibracteata Scutellaria brevibracteata Lamiaceae Photo: CC BY, yelena_antipovaScutellaria brittonii Scutellaria brittonii Britton's skullcap Photo: CC BY, Stephen HornbeckScutellaria californica Scutellaria californica California scullcap Photo: CC BY, gretchenparadisScutellaria coccinea Scutellaria coccinea Lamiaceae Photo: CC BY, Esteban Poveda all 57 ›

Names & registers

Also known as Scutellaria serrata var. montana; Scutellaria serrata var. serrata. (GBIF Backbone)

Under another author Scutellaria integrifolia Pursh is an older name of this species, not Scutellaria integrifolia, a species of the reference. (GBIF Backbone)

GBIFPOWOIPNIWFOWikidataWikipediaiNaturalist

The record

Family
Lamiaceae
Described by
Andrews
Native to
Illinois, New York, Ohio +10
Wild records
405 in range · 111 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; 12 records within 1 km of a botanic garden, herbarium or zoo left out (10 at a botanic garden or arboretum, 2 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 37.00_-80.625, lapse-corrected -31 m at 6.5 °C/km
Wikidata wikidata answeredasked 2026-10-22IPNI and POWO linked by Kew's number for Scutellaria serrata Andrews (the item's: IPNI 458652-1, POWO 458653-1)
Wikipedia wikipedia answeredasked 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 40 datasets via GBIF.org; each carries its own licence.

Cultifolio

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