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Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Rosids
Cladus: Eurosids I
Ordo: Rosales

Familia: Rosaceae
Subfamilia: Amygdaloideae
Tribus: Maleae
Subtribus: Malinae
Genus: Crataegus
Overview of species
a

C. aemula –C. aestivalis – C. alabamensis – C. alleghaniensis – C. × almaatensis – C. altaica – C. ambigua – C. × anamesa – C. annosa – C. apiomorpha – C. aprica – C. aquacervensis – C. arborea – C. arcana – C. × armena – C. arrogans – C. ashei – C. ater – C. × atrorubella – C. × atrorubens – C. atrosanguinea – C. atrovirens – C. attrita – C. aurantia – C. austromontana – C. azarolus
b

C. beadlei – C. beata – C. berberifolia – C. × bicknellii – C. biltmoreana – C. × bornmuelleri – C. boyntonii – C. brachyacantha – C. brainerdii – C. brazoria – C. brittonii – C. buckleyi
c

C. calpodendron – C. canadensis – C. × canescens – C. carrollensis – C. castlegarensis – C. caucasica – C. chlorocarpa – C. chlorosarca – C. christensenii – C. chrysocarpa – C. chrysophyta – C. chungtienensis – C. coccinea – C. coccinioides – C. cognata – C. × cogswellii – C. × coleae – C. × collicola – C. collina – C. colonica – C. communis – C. compacta – C. compta – C. condigna – C. consanguinea – C. contrita – C. coriifolia – C. corusca – C. christensenii – C. craytonii – C. crocea – C. crus-galli – C. cuneata – C. cupressocollina – C. curonica – C. curvisepala
d

C. dahurica – C. dallasiana – C. delawarensis – C. desueta – C. dilatata – C. × dippeliana – C. disjuncta – C. dispar – C. × disperma – C. × dispessa – C. distincta – C. dodgei – C. douglasii – C. dsungarica – C. dunensis – C. × durobrivensis – C. dzhairensis
e

C. egens – C. egregia – C. ellwangeriana – C. enderbyensis – C. engelmannii – C. erythrocarpa – C. erythropoda – C. estonica – C. exilis – C. eximia – C. extraria
f

C. fecunda – C. ferganensis – C. flabellata – C. flava – C. florens – C. floridana – C. florifera – C. fragilis – C. × fretalis – C. fluviatilis – C. forbesae – C. formosa – C. frugiferens – C. fulleriana – C. furtiva
g

C. gattingeri – C. gaylussacia – C. germanica – C. × gillotii – C. gilva – C. glareosa – C. gracilior – C. granatensis – C. grandifolia – C. grandis – C. greggiana – C. × grignonensis – C. grossidentata
h

C. × habereri – C. × haemacarpa – C. harbisonii – C. × hafniensis – C. harveyana – C. hatamii – C. heldreichii – C. helvina – C. heterophylla – C. heterophylloides – C. × hiemalis – C. hissarica – C. holmesiana – C. × hudsonica – C. hupehensis
i

C. × ideae – C. ignave – C. × immanis – C. impar – C. inanis – C. × incaedua – C. incilis – C. indicens – C. insidiosa – C. × inexpectans – C. integra – C. intricata – C. invicta – C. iracunda – C. irrasa – C. isfajramensis
j

C. jesupii – C. johnstonii – C. jonesiae
k

C. kansuensis – C. karadaghensis – C. keepii – C. × kelloggii – C. × kennedyi – C. khatamsazae – C. × killinica – C. kingstonensis – C. knieskerniana – C. knorringiana – C. komarovii – C. kurdistanica – C. × kyrtostyla – C. kupfferi
l

C. laciniata – C. lacrimata – C. laevigata – C. × lambertiana – C. lanata – C. lancei – C. × laneyi – C. lanuginosa – C. lassa – C. × latebrosa – C. laurentiana – C. × lauta – C. × lavalleei – C. lemingtonensis – C. leonensis – C. lepida – C. × lettermanii – C. levis – C. limata – C. limnophila – C. limophila – C. lindmanii – C. × lobata – C. longipes – C. longispina – C. × lucorum – C. lumaria
m

C. macracantha – C. × macrocarpa – C. macrosperma – C. magniflora – C. × maligna – C. margarettae – C. maritima – C. marshallii – C. maximowiczii – C. × media – C. membranacea – C. menandiana – C. mendosa – C. meridiana – C. meridionalis – C. mexicana – C. meyeri – C. microphylla – C. mira – C. mollis – C. monogyna – C. × mordenensis – C. multiflora – C. munda
n

C. nananixonii – C. necopinata – C. nelsonii – C. neobushii – C. nigra – C. nikotinii – C. × nina-celottiae – C. nitida – C. nitidula – C. noelensis – C. × notha – C. nuda
o

C. oakesiana – C. okanaganensis – C. okennonii – C. opaca – C. opima – C. opulens – C. orbicularis – C. oreophila – C. oresbia – C. orientalis – C. × osiliensis – C. ouachitensis
p

C. padifolia – C. pallasii – C. palmstruchii – C. paludosa – C. pamiroalaica – C. panda – C. pearsonii – C. × peckietta – C. pedicellata – C. × peloponnesiaca – C. penita – C. pennsylvanica – C. pentagyna – C. pequotorum – C. × peregrina – C. perjucunda – C. × permixta – C. persimilis – C. peshmenii – C. petrodavisii – C. pexa – C. phaenopyrum – C. phippsii – C. × pilosa – C. pinetorum – C. pinnatifida – C. piperi – C. × poliophylla – C. polita – C. poloniensis – C. × polyacantha – C. pontica – C. × poplavskae – C. populnea – C. porrecta – C. praestans – C. pratensis – C. pringlei – C. prona – C. pruinosa – C. × pseudoambigua – C. × pseudoazarolus – C. pseudoheterophylla – C. pseudomelanocarpa – C. pseudosanguinea – C. × puberis – C. pubescens – C. pulcherrima – C. punctata – C. purpurella – C. putata – C. putnamiana – C. pycnoloba
q

C. quaesita
r

C. ravida – C. remotilobata – C. resima – C. reverchonii – C. rhipidophylla – C. rhodella – C. rigens – C. rivularis – C. rivuloadamensis – C. rivulopugnensis – C. robinsonii – C. roribacca – C. rosei – C. rubella – C. rubribracteolata – C. × rubrinervis – C. × rubrocarnea – C. × rufula – C. × ruscinonensis – C. russanovii
s

C. sakranensis – C. saligna – C. sanguinea – C. sargentii – C. scabrida – C. scabrifolia – C. schizophylla – C. schuettei – C. segnis – C. senta – C. sera – C. serratissima – C. sextilis – C. shaferi – C. shandongensis – C. sheila-phippsiae – C. shensiensis – C. sheridana – C. shuswapensis – C. × sicca – C. × silicensis – C. × simulata – C. × sinaica – C. songarica – C. sororia – C. spathulata – C. spatiosa – C. spes-aestatum – C. sphaenophylla – C. spissa – C. stenosepala – C. stevenii – C. stolonifera – C. stonei – C. subheterophylla – C. submollis – C. suborbiculata – C. succulenta – C. suksdorfii – C. sulfurea
t

C. talyschensis – C. tanacetifolia – C. tanuphylla – C. tecta – C. tenuior – C. teres – C. texana – C. theodori – C. thermopegaea – C. tianschanica – C. tinctoria – C. tkatschenkoi – C. × tournefortii – C. tracyi – C. triflora – C. turcicus – C. turkestanica – C. turnerorum
u

C. ulotricha – C. uniflora – C. ursopedensis – C. uvaldensis
v

C. × vailiae – C. valida – C. venusta – C. versuta – C. viidumaegica – C. viridis – C. visenda – C. vulsa
w

C. warneri – C. wattiana – C. × websteri – C. × whitakeri – C. williamsii – C. wilsonii – C. wootoniana
x

C. xanthophylla
y

C. yaltirikii
z

C. zagrica – C. × zangezura – C. zarrei
Name

Crataegus L., 1753, nom. cons. prop. (2008)

Type species: C. rhipidophylla Gand. (C. oxyacantha L., nom. rej.)

Synonyms

Heterotypic
× Cratae-mespilus E.G.Camus in Morot (ed.) J. Bot., 13: 326. 1899, nom. superfl.
+ Crataego-mespilus Simon-Louis ex Bellair, Rev. Hort. (Paris) 71: 482. 1899.
Mespilus L. in Sp. Pl.: 478. 1 Mai 1753, nom. rej. prop. (2008).

References

Linnaeus, C. 1753. Species Plantarum. Tomus I: 475. Reference page.
Christensen, K.I. et al. 2014: Crataegus ×ninae-celottiae and C. ×cogswellii (Rosaceae, Maleae), two spontaneously formed intersectional nothospecies. PhytoKeys, 36: 1–26. DOI: 10.3897/phytokeys.36.6784 Reference page.
Rushforth, K.D. 2018. The Whitebeam problem, and a solution. Phytologia 100(4): 222–247. PDF Reference page.
Crataegus at the Euro+Med PlantBase
Ku, T.C. & Spongberg, S.A. 2003. Crataegus. Pp. 111-117 in Wu, Zh.Y. , Raven, P.H. & Hong, D.Y. (eds.), Flora of China. Volume 9: Pittosporaceae through Connaraceae. Science Press, Beijing & Missouri Botanical Garden Press, St. Louis, ISBN 1-930723-14-8. efloras PDF Reference page.
USDA, ARS, Germplasm Resources Information Network. Crataegus in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service.
Crataegus at USDA NRCS

Vernacular names
العربية: زعرور
azərbaycanca: Yemişan
žemaitėška: Graužoks
беларуская (тарашкевіца): Глог
беларуская: Глог
български: Глог
བོད་ཡིག: སྐྱུ་རུ་དམན་པ།
català: Crataegus
Mìng-dĕ̤ng-ngṳ̄: Săng-că
Cebuano: Crataegus
کوردی: گۆیژ
čeština: hloh
чӑвашла: Катăркас
dansk: Hvidtjørn
Deutsch: Weißdorne
dolnoserbski: Głog
Ελληνικά: Κράταιγος
English: Hawthorn
Esperanto: Kratago
español: Espino
eesti: Viirpuu
فارسی: زالزالک
suomi: Orapihlajat
Nordfriisk: Haageduurn
français: Aubépine
Frysk: Hagedoarn
Gàidhlig: Sgìtheach
עברית: עוזרר
hrvatski: Glog
hornjoserbsce: Hłohonc
magyar: Galagonya
հայերեն: Ալոճենի
Ido: Kratego
italiano: Biancospino
日本語: サンザシ
ქართული: კუნელი
қазақша: Долана
한국어: 산사나무속
kurdî: Guhîj
кыргызча: Долоно
Lëtzebuergesch: Hodar
lietuvių: Gudobelė
latviešu: Vilkābeles
македонски: Глог
مازِرونی: ولیگ
Nedersaksies: Smoapoeper
Nederlands: Meidoorn
norsk: Hagtorner
ирон: Дурвæткъуы
polski: Głóg
português: Espinheiro
русский: Боярышник
саха тыла: Долохуна
srpskohrvatski / српскохрватски: Glog
Simple English: Hawthorn
slovenčina: hloh
slovenščina: Glog
shqip: Bima e murrizit
српски / srpski: Глог
Seeltersk: Hoageltouden
svenska: Hagtornssläktet
Türkçe: Alıç
удмурт: Атасгурӟон
українська: Глід
oʻzbekcha/ўзбекча: Doʻlana
Tiếng Việt: Chi Sơn tra
walon: Årdispene
Vahcuengh: Sanhcah
粵語: 山楂
中文: 山楂

Crataegus (/krəˈtiːɡəs/[2]), commonly called hawthorn, quickthorn,[3] thornapple,[4] May-tree,[5] whitethorn,[5] Mayflower, or hawberry, is a genus of several hundred species of shrubs and trees in the family Rosaceae,[6] native to temperate regions of the Northern Hemisphere in Europe, Asia, North Africa, and North America. The name "hawthorn" was originally applied to the species native to northern Europe, especially the common hawthorn C. monogyna, and the unmodified name is often so used in Britain and Ireland. The name is now also applied to the entire genus and to the related Asian genus Rhaphiolepis.

Etymology

The generic epithet, Crataegus, is derived from the Greek kratos "strength" because of the great strength of the wood and akis "sharp", referring to the thorns of some species.[7] The name haw, originally an Old English term for hedge (from the Anglo-Saxon term haguthorn, "a fence with thorns"),[8] also applies to the fruit.[9]
Description
Plant of Crataegus monogyna
Close-up of the flowers of C. monogyna

Crataegus species are shrubs or small trees, mostly growing to 5–15 m (15–50 ft) tall,[9] with small pome fruit and (usually) thorny branches. The most common type of bark is smooth grey in young individuals, developing shallow longitudinal fissures with narrow ridges in older trees. The thorns are small sharp-tipped branches that arise either from other branches or from the trunk, and are typically 1–3 cm (1⁄2–1 in) long (recorded as up to 11.5 cm or 4+1⁄2 inches in one case[9]). The leaves grow spirally arranged on long shoots, and in clusters on spur shoots on the branches or twigs. The leaves of most species have lobed or serrated margins and are somewhat variable in shape. The fruit, sometimes known as a "haw", is berry-like but structurally a pome containing from one to five pyrenes that resemble the "stones" of plums, peaches, etc., which are drupaceous fruit in the same subfamily.
Taxonomy

The number of species in the genus depends on taxonomic interpretation. Some botanists in the past recognised 1000 or more species,[10] many of which are apomictic microspecies. A reasonable number is estimated to be 200 species.[9] The genus likely first appeared in the Eocene, with the ancestral area likely being Eastern North America and in Europe, which at that time remained closely linked due to the North Atlantic Land Bridge. The earliest known leaves of the genus from the Eocene of North America, with the earliest leaves from Europe being from the Oligocene.[11]

The genus is classified into sections which are further divided into series.[12][13] Series Montaninsulae has not yet been assigned to a section.[13][14][15] The sections are:

section Brevispinae
section Crataegus
section Coccineae
section Cuneatae
section Douglasia
section Hupehensis
section Macracanthae
section Sanguineae

Selected species
Main articles: List of hawthorn species with yellow fruit and List of hawthorn species with black fruit

Crataegus aemula – Rome hawthorn
Crataegus aestivalis – May hawthorn
Crataegus altaica – Altai hawthorn
Crataegus ambigua – Russian hawthorn
Crataegus ambitiosa – Grand Rapids hawthorn
Crataegus anamesa – Fort Bend hawthorn
Crataegus ancisa – Mississippi hawthorn
Crataegus annosa – Phoenix City hawthorn
Crataegus aprica – sunny hawthorn
Crataegus arborea – Montgomery hawthorn
Crataegus arcana – Carolina hawthorn
Crataegus ater – Nashville hawthorn
Crataegus austromontana – valley head hawthorn
Crataegus azarolus – Azarole hawthorn
Crataegus berberifolia – barberry hawthorn
Crataegus biltmoreana – Biltmore hawthorn
Crataegus boyntonii – stinking hawthorn
Crataegus brachyacantha – blueberry hawthorn[16][17]
Crataegus brainerdii – Brainerd's hawthorn
Crataegus calpodendron – late hawthorn
Crataegus canbyi
Crataegus chlorosarca
Crataegus chrysocarpa – fireberry hawthorn
Crataegus coccinea – scarlet hawthorn
Crataegus coccinioides – Kansas hawthorn
Crataegus collina – hillside hawthorn
Crataegus crus-galli – cockspur hawthorn
Crataegus cuneata – Japanese hawthorn
Crataegus cupulifera
Crataegus dahurica
Crataegus dilatata – broadleaf hawthorn, Apple-leaf hawthorn
Crataegus douglasii – black hawthorn, Douglas hawthorn
Crataegus ellwangeriana
Crataegus erythropoda – cerro hawthorn
Crataegus flabellata – Gray's hawthorn, fanleaf hawthorn
Crataegus flava – yellow-fruited hawthorn
Crataegus fluviatilis
Crataegus fontanesiana
Crataegus harbisonii – Harbison's hawthorn
Crataegus heldreichii
Crataegus heterophylla – various-leaved hawthorn
Crataegus holmesiana – Holmes' hawthorn
Crataegus hupehensis
Crataegus intricata – thicket hawthorn, intricate hawthorn
Crataegus iracunda – stolon–bearing hawthorn
Crataegus jackii
Crataegus jonesae
Crataegus kansuensis – Gansu hawthorn
Crataegus laevigata – Midland hawthorn, English hawthorn
Crataegus lassa – sandhill hawthorn
Crataegus lepida
Crataegus macrosperma – big-fruit hawthorn
Crataegus marshallii – parsley-leaved hawthorn
Crataegus maximowiczii
Crataegus mercerensis
Crataegus mexicana – tejocote, Mexican hawthorn
Crataegus mollis – downy hawthorn
Crataegus monogyna – common hawthorn, oneseed hawthorn
Crataegus nigra – Hungarian hawthorn
Crataegus okanaganensis – Okanagan Valley hawthorn
Crataegus orientalis – oriental hawthorn
Crataegus pedicellata – scarlet hawthorn
Crataegus pennsylvanica – Pennsylvania thorn
Crataegus pentagyna – small-flowered black hawthorn
Crataegus peregrina
Crataegus persimilis – plumleaf hawthorn
Crataegus phaenopyrum – Washington hawthorn
Crataegus phippsii
Crataegus pinnatifida – Chinese hawthorn
Crataegus populnea – poplar hawthorn
Crataegus pratensis – prairie hawthorn
Crataegus pruinosa – frosted hawthorn
Crataegus pulcherrima – beautiful hawthorn
Crataegus punctata – dotted hawthorn, white hawthorn: sometimes claimed as the state flower of Missouri,[18] though the legislation does not specify a species[19]
Crataegus purpurella
Crataegus putnamiana
Crataegus pycnoloba
Crataegus rhipidophylla
Crataegus rivularis – river hawthorn
Crataegus saligna – willow hawthorn
Crataegus sanguinea – redhaw hawthorn, Siberian hawthorn
Crataegus sargentii – Sargent's hawthorn
Crataegus scabrida – rough hawthorn
Crataegus scabrifolia
Crataegus songarica
Crataegus spathulata – littlehip hawthorn
Crataegus submollis – Quebec hawthorn
Crataegus succulenta – fleshy hawthorn
Crataegus tanacetifolia – tansy–leaved thorn
Crataegus tracyi – Tracy hawthorn
Crataegus triflora – three-flowered hawthorn
Crataegus uniflora – one-flowered hawthorn, dwarf hawthorn
Crataegus viridis – green hawthorn, including cultivar 'Winter King'
Crataegus visenda
Crataegus vulsa – Alabama hawthorn
Crataegus wattiana
Crataegus wilsonii – Wilson hawthorn

Selected hybrids

Crataegus × ariifolia (= C. ariaefolia)
Crataegus × dsungarica
Crataegus × grignonensis – Grignon hawthorn, an unpublished name
Crataegus × lavalleei – Lavallée hawthorn, including Crataegus × carrierei
Crataegus × macrocarpa
Crataegus × media – the name for C. monogyna–C. laevigata hybrids
Crataegus × mordenensis – Morden hawthorn, including 'Toba' and 'Snowbird'
Crataegus × sinaica – za'rur
Crataegus × smithiana – red Mexican hawthorn, an unpublished name
Crataegus × vailiae

Ecology

Hawthorns provide food and shelter for many species of birds and mammals, and the flowers are important for many nectar-feeding insects. Hawthorns are also used as food plants by the larvae of a large number of Lepidoptera species, such as the small eggar moth, E. lanestris. Haws are important for wildlife in winter, particularly thrushes and waxwings; these birds eat the haws and disperse the seeds in their droppings.
Uses
Culinary use
Crataegus monogyna 'Crimson Cloud' in Elko, Nevada

The "haws" or fruits of the common hawthorn, C. monogyna, are edible. In the United Kingdom, they are sometimes used to make a jelly or homemade wine.[20] The leaves are edible, and if picked in spring when still young, are tender enough to be used in salads.[21] The young leaves and flower buds, which are also edible, are known as "bread and cheese" in rural England.[20] In the southern United States, fruits of three native species are collectively known as mayhaws and are made into jellies which are considered a delicacy. The Kutenai people of northwestern North America used red and black hawthorn fruit for food.

On Manitoulin Island, Ontario, some red-fruited species are called hawberries. During colonization, European settlers ate these fruits during the winter as the only remaining food supply. People born on the island are now called "haweaters".

The fruits of Crataegus mexicana are known in Mexico as tejocotes and are eaten raw, cooked, or in jam during the winter. They are stuffed in the piñatas broken during the traditional pre-Christmas celebration known as Las Posadas. They are also cooked with other fruits to prepare a Christmas punch. The mixture of tejocote paste, sugar, and chili powder produces a popular Mexican candy called rielitos, which is manufactured by several brands.

The 4 cm fruits of the species Crataegus pinnatifida (Chinese hawthorn) are tart, bright red, and resemble small crabapple fruits. They are used to make many kinds of Chinese snacks, including haw flakes and being coated in sugar syrup and put on a stick tanghulu. The fruits, which are called 山楂 shān zhā in Chinese, are also used to produce jams, jellies, juices, alcoholic beverages, and other drinks; these could in turn be used in other dishes (for instance, many older recipes for Cantonese sweet and sour sauce call for shānzhā jam). In South Korea, a liquor called sansachun (산사춘) is made from the fruits.

In Iran, the fruits of Crataegus (including Crataegus azarolus var. aronia, as well as other species) are known as zâlzâlak and eaten raw as a snack, or made into a jam known by the same name.

The fruits of North America's Crataegus greggiana are made into preserves.[22]
Research

A 2008 Cochrane Collaboration meta-analysis of previous studies concluded that evidence exists of "a significant benefit in symptom control and physiologic outcomes" for an extract of hawthorn used as an adjuvant in treating chronic heart failure.[23] A 2010 review[24] concluded that "Crataegus [hawthorn] preparations hold significant potential as a useful remedy in the treatment of cardiovascular disease". The review indicated the need for further study of the best dosages and concluded that although "many different theoretical interactions between Crataegus and orthodox medications have been postulated ... none have [yet] been substantiated.[24]

Phytochemicals found in hawthorn include tannins, flavonoids, oligomeric proanthocyanidins, and phenolic acids.[25]
Traditional medicine

Several species of hawthorn have been used in traditional medicine. The products used are often derived from C. monogyna, C. laevigata, or related Crataegus species, "collectively known as hawthorn", not necessarily distinguishing between these species.[9] The dried fruits of Crataegus pinnatifida (called shān zhā in Chinese) are used in traditional Chinese medicine, primarily as a digestive aid. A closely related species, Crataegus cuneata (Japanese hawthorn, called sanzashi in Japanese) is used in a similar manner. Other species (especially Crataegus laevigata) are used in herbal medicine where the plant is believed to strengthen cardiovascular function.[26]

The Kutenai people of northwestern North America used black hawthorn fruit (Kutenai language: kaǂa; approximate pronunciation: kasha) for food, and red hawthorn fruit (Kutenai language: ǂupǂi; approximate pronunciation: shupshi) in traditional medicine.[27]
Side effects

Overdose can cause cardiac arrhythmia and low blood pressure, while milder side effects include nausea and dizziness.[28] Patients taking digoxin should avoid taking hawthorn.[29][30]
Landscaping

Many species and hybrids are used as ornamental and street trees. The common hawthorn is extensively used in Europe as a hedge plant. During the British Agricultural Revolution in the eighteenth and nineteenth centuries, hawthorn saplings were mass propagated in nurseries to create the new field boundaries required by the Inclosure Acts.[31] Several cultivars of the Midland hawthorn C. laevigata have been selected for their pink or red flowers. Hawthorns are among the trees most recommended for water conservation landscapes.
Grafting
Hawthorn rootstock on a medlar tree in Totnes, United Kingdom

Hawthorn can be used as a rootstock in the practice of grafting. It is graft-compatible with Mespilus (medlar), and with pear, and makes a hardier rootstock than quince, but the thorny suckering habit of the hawthorn can be problematic.[9]

Seedlings of Crataegus monogyna have been used to graft multiple species on the same trunk, such as pink hawthorn, pear tree, and medlar, the result being trees which give pink and white flowers in May and fruits during the summer. "Chip budding" has also been performed on hawthorn trunks to have branches of several varieties on the same tree. Such trees can be seen in Vigo, Spain, and in the northwest of France (mainly in Brittany).
Bonsai

Many species of Hawthorn make excellent bonsai trees.[32] They are grown and enjoyed for their display of flowers.
Other uses

The wood of some Crataegus species is hard and resistant to rot.[8] In rural North America, it was prized for use as tool handles and fence posts.[6][8] First Nations people of western Canada used the thorns for durable fish hooks and minor skin surgeries.[8]
Folklore

The Scots saying "Ne'er cast a cloot til Mey's oot" conveys a warning not to shed any cloots (clothes) before the summer has fully arrived and the Mayflowers (hawthorn blossoms) are in full bloom.[33][34]

The custom of employing the flowering branches for decorative purposes on 1 May is of very early origin, but since the adoption of the Gregorian calendar in 1752, the tree has rarely been in full bloom in England before the second week of that month. In the Scottish Highlands, the flowers may be seen as late as the middle of June. The hawthorn has been regarded as the emblem of hope, and its branches are stated to have been carried by the ancient Greeks in wedding processions, and to have been used by them to deck the altar of Hymenaios. The supposition that the tree was the source of Jesus's crown of thorns doubtless gave rise to the tradition among the French peasantry (current as late as 1911) that it utters groans and cries on Good Friday, and probably also to the old popular superstition in Great Britain and Ireland that ill luck attended the uprooting of hawthorns. Branches of Glastonbury thorn (C. monogyna 'Biflora',[9] sometimes called C. oxyacantha var. praecox), which flowers both in December and in spring, were formerly highly valued in England, on account of the legend that the tree was originally the staff of Joseph of Arimathea.[35]

Robert Graves, in his book The White Goddess,[5] traces and reinterprets many European legends and myths in which the whitethorn (hawthorn), also called the May-tree, is central.
Hawthorn trees demarcate a garden plot; according to legend, they are strongly associated with the fairies

In Celtic lore, the hawthorn plant was used commonly for inscriptions[36] along with yew and apple. It was once said to heal the broken heart. In Ireland, the red fruit is, or was, called the Johnny MacGorey or Magory.

Serbian folklore that spread across Balkan notes that hawthorn (Serbian глог or glog) is essential to kill vampires, and stakes used for their slaying must be made from the wood of the thorn tree.[37]

In Gaelic folklore, hawthorn (in Scottish Gaelic, sgitheach and in Irish, sceach) 'marks the entrance to the otherworld' and is strongly associated with the fairies.[38] Lore has it that it is very unlucky to cut the tree at any time other than when it is in bloom; however, during this time, it is commonly cut and decorated as a May bush (see Beltane).[39] This warning persists to modern times; it has been questioned by folklorist Bob Curran whether the ill luck of the DeLorean Motor Company was associated with the destruction of a fairy thorn to make way for a production facility.[40]

The superstitious dread of harming hawthorn trees prevalent in the British Isles may also be connected to an old belief that hawthorns, and more especially 'lone thorns' (self-seeded specimens standing in isolation from other trees) originate from lightning or thunderbolts and give protection from lightning strikes.[41]

Hawthorn trees are often found beside clootie wells; at these types of holy wells, they are sometimes known as rag trees, for the strips of cloth which are tied to them as part of healing rituals.[42] 'When all fruit fails, welcome haws' was once a common expression in Ireland.

According to a medieval legend, the Glastonbury thorn, C. monogyna 'Biflora', which flowers twice annually, was supposed to have miraculously grown from a walking stick planted by Joseph of Arimathea at Glastonbury in Somerset, England. The original tree was destroyed in the sixteenth century during the English Reformation, but several cultivars have survived. Since the reign of King James I, it has been a Christmas custom to send a sprig of Glastonbury thorn flowers to the Sovereign, which is used to decorate the royal family's dinner table.[43]

In the Victorian era, the hawthorn represented hope in the language of flowers.[44]

The hawthorn – species unspecified[19] – is the state flower of Missouri. The legislation designating it as such was introduced by Sarah Lucille Turner, one of the first two women to serve in the Missouri House of Representatives.[45]
Propagation

Although it is commonly stated that hawthorns can be propagated by cutting, this is difficult to achieve with rootless stem pieces. Small plants or suckers are often transplanted from the wild. Seeds require stratification and take one or two years to germinate.[46] Seed germination is improved if the pyrenes that contain the seed are subjected to extensive drying at room temperature, before stratification.[47] Uncommon forms can be grafted onto seedlings of other species.[46]
References

J. B. Phipps (1997). Monograph of northern Mexican Crataegus (Rosaceae, subfam. Maloideae). Sida, Botanical Miscellany. Vol. 15. Botanical Research Institute of Texas. p. 12. ISBN 9781889878294.
Sunset Western Garden Book, 1995:606–607
I remember the kitchen as being large and airy. , 1974, A Field Guide to the Trees of Britain and Northern Europe, Collins, London
Voss, E. G. 1985. Michigan Flora: A guide to the identification and occurrence of the native and naturalized seed-plants of the state. Part II: Dicots (Saururaceae–Cornaceae). Cranbrook Institute of Science and University of Michigan Herbarium, Ann Arbor, Michigan.
Graves, Robert. The White Goddess: A Historical Grammar of Poetic Myth, 1948, amended and enlarged 1966, New York: Farrar, Straus and Giroux.
"Crataegus species - The hawthorns". Plants For A Future. 2012. Retrieved 12 April 2019.
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"Black hawthorn (Crataegus douglasii)". Ministry of Forests, Lands, Natural Resource Operations and Rural Development, Government of British Columbia. 2019. Retrieved 12 April 2019.
Phipps, J.B., O'Kennon, R.J., Lance, R.W. (2003). Hawthorns and medlars. Royal Horticultural Society, Cambridge, U.K.
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Phipps, J.B. (2015), "Crataegus", in L. Brouillet; K. Gandhi; C.L. Howard; H. Jeude; R.W. Kiger; J.B. Phipps; A.C. Pryor; H.H. Schmidt; J.L. Strother; J.L. Zarucchi (eds.), Flora of North America North of Mexico, vol. 9: Magnoliophyta: Picramniaceae to Rosaceae, New York, Oxford: Oxford University Press, pp. 491–643, ISBN 978-0-19-534029-7
Crataegus Linnaeus (sect. Coccineae) ser. Punctatae (Loudon) Rehder, Man. Cult. Trees ed. 2. 365. 1940
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Tassell M, Kingston R, Gilroy D, Lehane M, Furey A (2010). "Hawthorn (Crataegus spp.) in the treatment of cardiovascular disease". Pharmacognosy Reviews. 4 (7): 32–41. doi:10.4103/0973-7847.65324. PMC 3249900. PMID 22228939. Archived from the original on 19 October 2018. Retrieved 11 November 2010.
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Tankenow Roberta; Tamer Helen R.; Streetman Daniel S.; Smith Scott G.; Welton Janice L.; Annesley Thomas; Aaronson Keith D.; Bleske Barry E. (2003). "Interaction Study between Digoxin and a Preparation of Hawthorn (Crataegus oxyacantha)" (PDF). J Clin Pharmacol. 43 (6): 637–642. doi:10.1177/0091270003253417. hdl:2027.42/97293. PMID 12817526. S2CID 9888330.
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