Symphyotrichum cordifolium, Clay County, US-NC, US

Symphyotrichum cordifolium (L.) G.L.Nesom

Beeweed, Blaue Wald-Herbstaster, Blue Wood Aster, Common Blue Heart-leaf Aster

Climate known 110 photographs

Every figure on this page is derived from public data by a stated rule and says its source; nothing here is written by a person or a model, except the Wikipedia passage, which is quoted and marked as such. How it is made.

Summary

Symphyotrichum cordifolium, commonly known as common blue wood aster, heartleaf aster, and blue wood-aster, is a perennial herbaceous flowering plant in the family Asteraceae native to central and eastern North America. It reaches heights of up to 1.2 meters and has bluish daisy-like flowers which bloom late-summer and fall in its range.

Text from Wikipedia, “Symphyotrichum cordifolium”, CC BY-SA 4.0, quoted as written. Kept separate from everything derived here.

About the genus · Symphyotrichum

Symphyotrichum is a genus of over 100 species and naturally occurring hybrids of herbaceous annual and perennial plants in the composite family, Asteraceae, most which were formerly treated within the genus Aster. The majority are endemic to North America, but several also occur in the West Indies, Central and South America, as well as one species in eastern Eurasia. Several species have been introduced to Europe as garden specimens, most notably New England aster and New York aster.

Text from Wikipedia, “Symphyotrichum”, CC BY-SA 4.0, quoted as written.

Family

Asteraceae

Described by

(L.) G.L.Nesom

Native to

Manitoba, New Brunswick, Nova Scotia +35

Wild records

1850 in range· 645 open

At a glance

Warmest month

27°C

Jul, mean day; nights 18 °C (CHELSA)

Rain

1143mm/yr

12 wet months · peak Jul 110 mm (CHELSA)

Light

10–39DLI

mol/m²/day, winter to summer, open sky (CHELSA shortwave)

In short condensed by rule from the cultivation cards · not written by a person

Rain rule: no season, 70% of the rain takes 8 months (April to November in the northern hemisphere). Habitat rain 1143 mm a year, wettest July at 110 mm, driest February at 73 mm (habitat calendar, northern hemisphere). Open sky over the habitat: 10 to 39 mol/m²/day. Cold floor -18.7 °C (1st-percentile habitat night, NASA POWER).

Each sentence is one card's own one-line form, written by the same rule as the card (Its year, Rain, Light, Temperature); the note cannot say what a card does not. Months are given for the northern hemisphere (set your site in Settings to change this), and the habitat's own alongside. The cards · the figures.

Also known as Aster cordifolius L.; Aster cordifolius subsp. cordifolius; Aster cordifolius subsp. laevigatus (Porter) A.G.Jones; Aster cordifolius subsp. sagittifolius (Wedem. ex Willd.) A.G.Jones; Aster cordifolius var. alvearius E.S.Burgess and 45 more.

Cultivation

Its year Rain rule: no season, 70% of the rain takes 8 months (April to November in the northern hemisphere).

This species’ habitat figures, and what two fixed rules read from them.

The rain rule reads no season: 70% of the year's rain (811 mm of 1143 mm) takes 8 months, April to November. Mean temperature moves 25.8 °C between the warmest and coldest month. Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: October to May.

Read from the median year of CHELSA monthly rainfall and mean temperature across the envelope cells: 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 gives a season to reverse. A reading of the curves, not an observation of the plant.

Rain Habitat rain 1143 mm a year, wettest July at 110 mm, driest February at 73 mm (habitat calendar, northern hemisphere).

This species’ habitat figures, with their source.

1143 mm a year at the habitat, 811 mm of it April to November. Wettest month July at 110 mm, driest February at 73 mm. Across the envelope cells the year's total runs 922 mm to 1388 mm (10th to 90th percentile of each cell's own year) (median year across the envelope cells, CHELSA; habitat calendar, northern hemisphere).

CHELSA monthly precipitation, median year across the envelope cells. The rain that falls where the species is recorded; nothing about how the plant takes water.

Light Open sky over the habitat: 10 to 39 mol/m²/day.

This species’ habitat figures, with their source.

Open sky over the habitat: 10 to 39 mol/m²/day across the year (daily light integral, median year across the envelope cells, CHELSA; the lowest 10th-percentile month across the cells is 8, the highest 90th-percentile month 41).

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.

Warmth and air Cold floor -18.7 °C (1st-percentile habitat night, NASA POWER).

This species’ habitat figures, with their source.

Temperature

Coldest: the 1st-percentile night over 44 years at the typical cell is -18.7 °C, the absolute minimum -30.2 °C, about 137 frost nights a year (NASA POWER daily minima). Warmest: the 99th-percentile day is 33.7 °C. Monthly means: coldest night -7.7 °C in January (across the envelope cells -14.6 °C to -3.3 °C), warmest day 26.6 °C in July (median year across the envelope cells, CHELSA). Cold floor: -18.7 °C, which is the 1st-percentile night over 44 years at the typical cell (NASA POWER).

NASA POWER daily minima and maxima 1981–2024 at the typical cell, lapse-corrected to its elevation; CHELSA monthly means, median year across the envelope cells, CHELSA. The cold floor is the figure named in its sentence. Not a measured survival limit for any plant in a pot.

Humidity

Relative humidity at the habitat: 56 to 61% across the year (monthly means, median year across the envelope cells, CHELSA). A figure about the air, saying nothing about how the plant takes water.

CHELSA relative humidity, median year across the envelope cells.

The figures the cards read from are in Climate below, and where they came from in Natural habitat.

Climate across the habitat

day night rain 10th–90th percentile across 1381 habitat cells cold quarter: the three months around the coldest night extremes over 44 years at the typical cell, marked at the edge: undated DLI, mol/m²/dayRH %each on its own scale

Figures by month

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Day °C	0 / -5–5	2 / -3–8	7 / 3–13	14 / 10–18	19 / 17–23	24 / 22–28	27 / 24–30	26 / 23–29	22 / 19–25	15 / 12–19	9 / 5–13	3 / -2–7
Night °C	-8 / -15–-3	-7 / -13–-2	-3 / -7–2	4 / 0–7	9 / 7–13	15 / 12–18	18 / 15–20	17 / 15–20	13 / 11–16	7 / 4–10	2 / -2–5	-4 / -10–-1
Rain mm	80 / 59–107	73 / 55–103	87 / 59–119	95 / 74–118	105 / 87–131	108 / 88–129	110 / 87–133	100 / 83–122	100 / 84–121	97 / 73–122	96 / 78–122	92 / 66–122
DLI	12 / 10–15	18 / 17–20	26 / 24–27	32 / 30–34	36 / 35–38	39 / 37–41	38 / 37–40	33 / 32–36	27 / 24–29	19 / 16–22	12 / 9–15	10 / 8–13
RH %	61 / 57–64	59 / 56–62	57 / 55–59	56 / 55–57	57 / 55–59	59 / 57–61	59 / 57–61	60 / 58–62	60 / 58–62	59 / 57–61	60 / 58–62	61 / 57–64

Each figure is the median across the 1381 grid cells holding the 1745 in-range records, with the 10th–90th percentile span across those cells after the slash where it differs. Extremes and elevation were read at the typical cell 939:2069 (43.025, -76.525). Over 44 years there: absolute minimum -30.2 °C, 1st-percentile night -18.7 °C, 99th-percentile day 33.7 °C. Normals: CHELSA V2.1 1981–2010 climatology, 0.05° cells (each the mean of ~36 1 km pixels). Envelope: median and 10th–90th percentile of each month across the 1381 distinct grid cells holding the 1745 in-range records; extremes and elevation at the typical cell 939:2069 (its coldest month's mean night nearest the median across cells); its position is the cell centre. Extremes: NASA POWER (MERRA-2) daily 1981–2024, cell 43.00_-76.250, lapse-corrected -49 m at 6.5 °C/km. Elevation: ETOPO 2022, 173 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 every in-range record's cell, not at the marker.

Openly licensed records inside the range, framed on where they fall.

NativeManitoba, New Brunswick, Nova Scotia, Ontario, Prince Edward I., Québec, Illinois, Iowa, Minnesota, Missouri, Nebraska, Oklahoma, South Dakota, Wisconsin, Connecticut, Indiana, Maine, Massachusetts, Michigan, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode I., Vermont, West Virginia, Texas, Alabama, Arkansas, Georgia, Kentucky, Maryland, North Carolina, South Carolina, Tennessee, Virginia, District of Columbia· introduced: Great Britain, Norway, Germany, Poland

Kew's description“perennial”· quoted from WCVP, RBG Kew (CC BY 4.0); not derived here

Map marker40.869, -74.208 · in the densest population, 810 records (44% of those in range)

Evidence usedThe map marker and the climate envelope rest on all 1850 georeferenced records inside the native range; the map shows only the 645 openly licensed ones, which alone would put the marker 1 km away. 4 records outside the range (gardens, roadsides, misidentifications) ignored. 105 in-range records are placed to worse than 10 km and stay on the map but off the climate.

The map markerthe map marker: the openly licensed record nearest the middle of the densest 1° population inside the densest 2° block of the 1850 in-range records; it decides nothing.

Photographs

Photographs: (c) Alan Rockefeller, some rights reserved (CC BY) (6); (c) Tom Norton, some rights reserved (CC BY) (2).

Photographs: iNaturalist did not answer when this page was built; what is shown came from the sources that did.

Papers naming this species

Works whose title or abstract names Symphyotrichum cordifolium, most cited first, from OpenAlex (CC0). A mention, not a cultivation source: nothing on this page is drawn from them.

New national and regional plant records: Contribution to the flora of the Old World countries

Marcin Nobis, Sławomir Wróbel, Ewelina Klichowska, Arkadiusz Nowak (2023) · Acta Societatis Botanicorum Poloniae

Occurrence Download

GBIF.Org User (2023) · Global Biodiversity Information Facility

Occurrence Download