Crataegus calpodendron(Ehrh.) Medik.

pear hawthorn

WFO wfo-0001010107 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h · 2 observations

This species has been photographed under an open licence only 2 times, so some figures below are different views of the same plant, taken on the same day, rather than different individuals. They are usually different parts of it: the leaf, the flower, the bark.

Crataegus calpodendron, photographed by John Kees
fig. a John Kees, CC0 1.0 / 2021-05-16 / obs. 129485794
Crataegus calpodendron, photographed by Will McFarland
fig. b Will McFarland, CC BY 4.0 / obs. 50839693
Crataegus calpodendron, photographed by John Kees
fig. c John Kees, CC0 1.0 / obs. 129485823
Crataegus calpodendron, photographed by Will McFarland
fig. d Will McFarland, CC BY 4.0 / obs. 50839730
Crataegus calpodendron, photographed by John Kees
fig. e John Kees, CC0 1.0 / obs. 129485845
Crataegus calpodendron, photographed by Will McFarland
fig. f Will McFarland, CC BY 4.0 / obs. 50839761
Crataegus calpodendron, photographed by John Kees
fig. g John Kees, CC0 1.0 / obs. 129485872
Crataegus calpodendron, photographed by Will McFarland
fig. h Will McFarland, CC BY 4.0 / obs. 50839841

Every figure is a research-grade observation under CC0, CC BY or CC BY-SA, rehosted with the photographer’s name, the licence and the observation it came from. Photographs under a NonCommercial licence are excluded from this site and are never stored, which costs us a great many pictures and is not negotiable.

Native range 22 botanical countries

Regions where Crataegus calpodendron is native: Alabama, Arkansas, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Maryland, Michigan, Minnesota, Mississippi, Nebraska, New York, Ohio, Oklahoma, Ontario, Pennsylvania, Tennessee, Virginia, West Virginia, Wisconsin AlabamaArkansasGeorgiaIllinoisIndianaIowaKansasKentuckyMarylandMichiganMinnesotaMississippiNebraskaNew YorkOhioOklahomaOntarioPennsylvaniaTennesseeVirginiaWest VirginiaWisconsin
Native distribution of Crataegus calpodendron, after Kew’s World Checklist of Vascular Plants. Introduced, extinct and doubtful records are excluded, so this is where the plant is from, not everywhere it now grows.
RegionTDWG codeContinent
Alabama ALA NORTHERN AMERICA
Arkansas ARK
Georgia GEO
Illinois ILL
Indiana INI
Iowa IOW
Kansas KAN
Kentucky KTY
Maryland MRY
Michigan MIC
Minnesota MIN
Mississippi MSI
Nebraska NEB
New York NWY
Ohio OHI
Oklahoma OKL
Ontario ONT
Pennsylvania PEN
Tennessee TEN
Virginia VRG
West Virginia WVA
Wisconsin WIS

Region boundaries approximated from Natural Earth (public domain) and mapped to TDWG World Geographical Scheme for Recording Plant Distributions (WGSRPD) level-3 botanical countries (Brummitt 2001). Indicative, not the official WGSRPD geometry.

Where it actually grows measured, from 51 observations

Condition 5th percentile Median 95th percentile
Coldest month, mean daily low -9.1 °C -6.3 °C 1.0 °C
Warmest month, mean daily high 25.6 °C 27.6 °C 32.2 °C
Annual rainfall 954 mm 1,064 mm 1,442 mm
Rainfall in the driest quarter 157 mm 217 mm 287 mm

It is found where winters bring hard frost. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 51 research-grade observations of Crataegus calpodendron that carry a coordinate, and this is the range those places actually span. The 5th and 95th percentiles are used rather than the minimum and maximum, because a single cultivated specimen in a heated conservatory should not widen a tropical plant's range to the Arctic.

This is not a hardiness zone. A USDA zone is the average annual extreme minimum temperature. The figure above is the mean daily minimum of the coldest month, which is a different quantity and is typically far warmer. Reading one as the other would place a plant several zones too warm, so we do not publish a hardiness zone, because we do not have one.

Also published as 50 synonyms

A synonym is not an error. It is a record of botanists disagreeing, in print, about where this plant belongs. Each of these was somebody’s considered answer.

  • Crataegus acanthacolonensis Laughlin
  • Crataegus calpodendron var. calpodendron
  • Crataegus calpodendron var. gigantea Kruschke
  • Crataegus calpodendron var. globosa (Sarg.) E.J.Palmer
  • Crataegus calpodendron var. hispida (Sarg.) E.J.Palmer
  • Crataegus calpodendron var. hispidula (Sarg.) E.J.Palmer
  • Crataegus calpodendron var. microcarpa (Chapm.) E.J.Palmer
  • Crataegus calpodendron var. mollicula (Sarg.) E.J.Palmer
  • Crataegus calpodendron var. obesa (Ashe) E.J.Palmer
  • Crataegus carrollensis Sarg.
  • Crataegus chapmanii (Beadle) Ashe
  • Crataegus chapmanii var. plukenetii Eggl.
  • Crataegus crus-galli Mill.
  • Crataegus crus-galli var. fontanesiana (Spach) Dippel
  • Crataegus fontanesiana (Spach) Steud.
  • Crataegus globosa Sarg.
  • Crataegus hispidula Sarg.
  • Crataegus latifolia (Poir.) Pers.
  • Crataegus leucophleos Moench
  • Crataegus lutea (Poir.) DC.
  • Crataegus mollicula Sarg.
  • Crataegus obesa Ashe
  • Crataegus pubifolia Ashe
  • Crataegus pyrifolia Aiton

and 26 more.

Sourcesevery claim on this page

  1. World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
  2. iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
  3. Wikidata. common name (P1843), joined on the World Flora Online identifier (P7715). CC0. Retrieved 2026-07-13.
  4. Kew, World Checklist of Vascular Plants (WCVP v16). native distribution by TDWG level-3 botanical country, and life form. CC BY 3.0. Retrieved 2026-06-04.

We publish what we can source and we say so when we cannot. This page has no care advice and no toxicity claim, because we do not yet have those from a source we can cite.