Crabapple

Malus (/ˈmeɪləs/^[3] or /ˈmæləs/) is a genus of about 32–57 species^[4] of small deciduous trees or shrubs in the family Rosaceae, including the domesticated orchard apple, crab apples (sometimes known in North America as crabapples) and wild apples.

The genus is native to the temperate zone of the Northern Hemisphere.

Description

Apple trees are typically 4–12 metres (13–39 feet) tall at maturity, with a dense, twiggy crown. The leaves are 3–10 centimetres (1+1⁄4–4 inches) long, alternate, simple, with a serrated margin. The flowers are borne in corymbs, and have five petals, which may be white, pink, or red, and are perfect, with usually red stamens that produce copious pollen, and a half-inferior ovary; flowering occurs in the spring after 50–80 growing degree-days, varying greatly according to subspecies and cultivar.^{[citation needed]}

Many apples require cross-pollination between individuals by insects (typically bees, which freely visit the flowers for both nectar and pollen); these are called self-sterile, so self-pollination is impossible, making pollinating insects essential.^[5]

A number of cultivars are self-pollinating, such as "Granny Smith" and "Golden Delicious", but are considerably fewer in number compared to their cross-pollination dependent counterparts.^{[citation needed]} Several Malus species, including domestic apples, hybridize freely.^[6]

The fruit is a globose pome, varying in size from 1–4 cm (1⁄2–1+1⁄2 in) in diameter in most of the wild species, to 6 cm (2+1⁄4 in) in M. sylvestris sieversii, 8 cm (3 in) in M. domestica, and even larger in certain cultivated orchard apples. The centre of the fruit contains five carpels arranged star-like, each containing one or two seeds.^{[citation needed]}

Trunk
Crabapple blossoms
Eastern Siberia

Subdivision

36 species and 4 hybrids are accepted.^[2] The genus Malus is subdivided into eight sections (six, with two added in 2006 and 2008).^{[citation needed]} The oldest fossils of the genus date to the Eocene (Lutetian), which are leaves belonging to the species Malus collardii and Malus kingiensis from western North America (Idaho) and the Russian Far East (Kamchatka), respectively.^[7]

Species

36 species and four natural hybrids are accepted:^[2]

Malus angustifolia (Aiton) Michx. – southern crabapple
Malus asiatica Nakai – Chinese pearleaf crabapple
Malus baccata (L.) Borkh. – Siberian crabapple
Malus brevipes – shrub apple
Malus coronaria (L.) Mill. – sweet crabapple
Malus crescimannoi Raimondo
Malus daochengensis C.L.Li
Malus domestica (Suckow) Borkh. – domestic or orchard apple
Malus doumeri (Bois) A.Chev. – Taiwan crabapple
Malus florentina (Zuccagni) C.K.Schneid. – Florentine crabapple, hawthorn-leaf crabapple
Malus fusca (Raf.) C.K.Schneid. – Oregon or Pacific crabapple
Malus halliana Koehne – Hall crabapple
Malus honanensis Rehder
Malus hupehensis (Pamp.) Rehder – tea crabapple
Malus ioensis (Alph.Wood) Britton – prairie crabapple
Malus jinxianensis J.Q.Deng & J.Y.Hong
Malus kansuensis (Batalin) C.K.Schneid. – Calva crabapple
Malus komarovii (Sarg.) Rehder
Malus leiocalyca S.Z.Huang
Malus mandshurica (Maxim.) Kom. ex Skvortsov
Malus muliensis T.C.Ku
Malus niedzwetzkyana – Niedzwetzky's Apple
Malus ombrophila Hand.-Mazz.
Malus orientalis Uglitzk.
Malus prattii (Hemsl.) C.K.Schneid. – Pratt's crabapple
Malus prunifolia (Willd.) Borkh. – plum-leaf crabapple, Chinese crabapple
Malus rockii Rehder – native to China and Bhutan
Malus sikkimensis (Wenz.) Koehne – Sikkim crabapple
Malus spectabilis (Aiton) Borkh. – Asiatic apple, Chinese crabapple
Malus spontanea (Makino) Makino - nokaidō
Malus sylvestris (L.) Mill. – European crabapple
Malus toringo (Siebold) de Vriese (syns. Malus sargentii, Malus sieboldii) – Sargent crabapple, Toringo crabapple, or Siebold's crabapple
Malus toringoides (Rehder) Hughes – cut-leaf crabapple
Malus transitoria (Batalin) C.K.Schneid. – cut-leaf crabapple
Malus trilobata (Labill. ex Poir.) C.K.Schneid. – Lebanese wild apple, erect crabapple, or three-lobed apple tree
Malus turkmenorum Juz. & Popov (syn. Malus sieversii) – wild ancestor of cultivated species Malus domestica
Malus yunnanensis (Franch.) C.K.Schneid. – Yunnan crabapple
Malus zhaojiaoensis N.G.Jiang

Hybrids

Malus × floribunda Siebold ex Van Houtte – Japanese flowering crabapple
Malus × kaido (Wenz.) Pardé (syn. Malus × micromalus) – midget crabapple
Malus × soulardii (L.H.Bailey) Britton
Malus × zumi (Matsum.) Rehder

Formerly placed here

Macromeles tschonoskii (Maxim.) Koidz. (as Malus tschonoskii (Maxim.) C.K.Schneid.) – Chonosuki crabapple and pillar apple^{[citation needed]}

Selected artificial hybrids

Malus × sublobata – yellow autumn crabapple (M. asiatica × M. toringo)

Fossil species

After^[7]

Malus collardii Axelrod, North America (Idaho), Eocene
Malus kingiensis Budants, Kamchatka Peninsula, Russia, Eocene
Malus florissantensis (Cockerell) MacGinitie Green River Formation, North America (Colorado) Eocene
Malus pseudocredneria (Cockerell) MacGinitie Green River Formation, North America (Colorado) Eocene
Malus idahoensis R.W.Br. North America (Idaho), Miocene
Malus parahupehensis J.Hsu and R.W.Chaney Shanwang, Shandong, China, Miocene
Malus antiqua Doweld Romania, Pliocene
Malus pseudoangustifolia E.W.Berry North America (South Carolina), Pleistocene

Cultivation

Crabapples are popular as compact ornamental trees, providing blossom in spring and colourful fruit in autumn. The fruits often persist throughout winter. Numerous hybrid cultivars have been selected.^{[citation needed]}

Some crabapples are used as rootstocks for domestic apples to add beneficial characteristics.^[8] For example, the rootstocks of Malus baccata varieties are used to give additional cold hardiness to the combined plants for orchards in cold northern areas.^[9]

They are also used as pollinizers in apple orchards. Varieties of crabapple are selected to bloom contemporaneously with the apple variety in an orchard planting, and the crabs are planted every sixth or seventh tree, or limbs of a crab tree are grafted onto some of the apple trees. In emergencies, a bucket or drum bouquet of crabapple flowering branches is placed near the beehives as orchard pollenizers.^{[citation needed]}

Because of the plentiful blossoms and small fruit, crabapples are popular for use in bonsai culture.^[10]^[11]^[12]

Cultivars

These cultivars have won the Royal Horticultural Society's Award of Garden Merit:^[13]

'Adirondack'^[14]
'Butterball'^[15]
'Comtesse de Paris'^[16]
'Evereste'^[17]
'Jelly King'='Mattfru'^[18]
'Laura'^[19]
Malus × robusta 'Red Sentinel'^[20]
'Sun Rival'^[21]

Other varieties are dealt with under their species names.

Toxicity

The seeds contain cyanide compounds.^[22]

Uses

330px Crabapples - Crabapple — Ripe apples (*M. domestica*)

330px Lee Russell Farm Security Administration 1939 Crab Apples - Crabapple — Baskets of crab apples for sale in Connecticut in 1939

Crabapple fruit is not an important crop in most areas, being extremely sour due to malic acid (which like the genus derives from the Latin name mālum), and in some species woody, so is rarely eaten raw. In some Southeast Asian cultures, they are valued as a sour condiment, sometimes eaten with salt and chilli or shrimp paste.^{[citation needed]}

Some crabapple varieties are an exception to the reputation of being sour, and can be very sweet, such as the 'Chestnut' cultivar.^[23]

Crabapples are an excellent source of pectin. Using sugar and spices such as ginger, nutmeg, cinnamon, and allspice, their juice can be made into ruby-coloured crab apple jelly with a full, spicy flavour.^[24] A small percentage of crabapples in cider makes a more interesting flavour.^[25] As Old English Wergulu, the crab apple is one of the nine plants invoked in the pagan Anglo-Saxon Nine Herbs Charm, recorded in the 10th century.

Applewood gives off a pleasant scent when burned, and smoke from an applewood fire gives an excellent flavour to smoked foods.^[26] It is easier to cut when green; dry applewood is exceedingly difficult to carve by hand.^[26] It is a good wood for cooking fires because it burns hot and slow, without producing much flame.^[26] Applewood is used to make handles of hand saws; in the early 1900s 2,000,000 board feet of applewood were used annually for this purpose.^[27]

References

^ Cirrus Digital Purple Prince Crabapple
^ ^a ^b ^c "Malus Mill". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 17 December 2023.
^ Sunset Western Garden Book, 1995:606–607
^ Phipps, James B.; Robertson, Kenneth R.; Smith, Paul G.; Rohrer, Joseph R. (1990). "A checklist of the subfamily Maloideae (Rosaceae)". Can. J. Bot. 68 (10): 2209–2269. doi:10.1139/b90-288.
^ coreyrametta (2019-06-11). "Are Apple Trees Self Pollinating?". Cold Hardy Fruits. Retrieved 2024-05-02.
^ Ken Wilson and D.C. Elfving. "Crabapple Pollenizers for Apples". Ontario Ministry of Agriculture and Food. Retrieved 12 Sep 2013.
^ ^a ^b Liu, Bin-Bin; Ren, Chen; Kwak, Myounghai; Hodel, Richard G.J.; Xu, Chao; He, Jian; Zhou, Wen-Bin; Huang, Chien-Hsun; Ma, Hong; Qian, Guan-Ze; Hong, De-Yuan; Wen, Jun (May 2022). "Phylogenomic conflict analyses in the apple genus Malus s.l. reveal widespread hybridization and allopolyploidy driving diversification, with insights into the complex biogeographic history in the Northern Hemisphere". Journal of Integrative Plant Biology. 64 (5): 1020–1043. doi:10.1111/jipb.13246. ISSN 1672-9072. PMID 35274452. S2CID 247384781.
^ Apple Tree Rootstocks Ecogardening Factsheet #21, Summer 1999
^ Apple Rootstocks, Alaska Department of Natural Resources Archived 2008-07-19 at the Wayback Machine
^ Biel, John. "Collecting and Training Crab Apples | American Bonsai Society". www.absbonsai.org. American Bonsai Society. Archived from the original on 3 July 2016. Retrieved 2 August 2016.
^ "Crabapple (Malus) - Bonsai Empire". www.bonsaiempire.com. Retrieved 2 August 2016.
^ Walston, Brent. "Crabapples for Bonsai". evergreengardenworks.com. Retrieved 2 August 2016.
^ "AGM Plants - Ornamental" (PDF). Royal Horticultural Society. July 2017. p. 63. Retrieved 2 April 2018.
^ "RHS Plantfinder - Malus 'Adirondack'". Retrieved 25 March 2018.
^ "RHS Plantfinder - Malus 'Butterball'". Retrieved 25 March 2018.
^ "Malus 'Comtesse de Paris'". RHS. Retrieved 6 January 2021.
^ "RHS Plantfinder -Malus 'Evereste'". Retrieved 25 March 2018.
^ "RHS Plantfinder - Malus Jelly King = 'Mattfru'". Retrieved 25 March 2018.
^ "RHS Plantfinder - Malus 'Laura'". Retrieved 25 March 2018.
^ "RHS Plantfinder - Malus × robusta 'Red Sentinel'". Retrieved 25 March 2018.
^ "RHS Plantfinder - Malus 'Sun Rival'". Retrieved 25 March 2018.
^ The Complete Guide to Edible Wild Plants. United States Department of the Army. New York: Skyhorse Publishing. 2009. p. 113. ISBN 978-1-60239-692-0. OCLC 277203364.{{cite book}}: CS1 maint: others (link)
^ "The Growing Guide". Stark Bro's Nurseries & Orchards Co. Archived from the original on 2014-07-26.
^ Rombauer, I.; Becker, M. R.; Becker, E. (2002) [2002]. All About Canning & Preserving (The Joy of Cooking series). New York: Scribner. p. 72. ISBN 0-7432-1502-8.
^ "The Science of Cidermaking". Andrew Lea. Retrieved November 14, 2013.
^ ^a ^b ^c Fraser, Anna (22 August 2005). "Properties of different trees as firewood". Retrieved 17 July 2008.
^ Burks, Jeff (2015). "Woods Used in Saw Handles". Lost Art Press, Traditional Hand-tool Skills. blog.lostartpress.com.

External links

Germplasm Resources Information Network: Malus
Flora of China: Malus
Virginia Cooperative Extension - Disease resistant crabapples Archived 8 February 2007 at the Wayback Machine
The PRI disease resistant apple breeding program: a cooperative among Purdue University, Rutgers University, and the University of Illinois.

[1] Cirrus Digital Purple Prince Crabapple

[powo-2] "Malus Mill". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 17 December 2023.

[3] Sunset Western Garden Book, 1995:606–607

[4] Phipps, James B.; Robertson, Kenneth R.; Smith, Paul G.; Rohrer, Joseph R. (1990). "A checklist of the subfamily Maloideae (Rosaceae)". Can. J. Bot. 68 (10): 2209–2269. doi:10.1139/b90-288.

[5] reyrametta (2019-06-11). "Are Apple Trees Self Pollinating?". Cold Hardy Fruits. Retrieved 2024-05-02.

[6] Ken Wilson and D.C. Elfving. "Crabapple Pollenizers for Apples". Ontario Ministry of Agriculture and Food. Retrieved 12 Sep 2013.

[:0-7] Liu, Bin-Bin; Ren, Chen; Kwak, Myounghai; Hodel, Richard G.J.; Xu, Chao; He, Jian; Zhou, Wen-Bin; Huang, Chien-Hsun; Ma, Hong; Qian, Guan-Ze; Hong, De-Yuan; Wen, Jun (May 2022). "Phylogenomic conflict analyses in the apple genus Malus s.l. reveal widespread hybridization and allopolyploidy driving diversification, with insights into the complex biogeographic history in the Northern Hemisphere". Journal of Integrative Plant Biology. 64 (5): 1020–1043. doi:10.1111/jipb.13246. ISSN 1672-9072. PMID 35274452. S2CID 247384781.

[8] Apple Tree Rootstocks Ecogardening Factsheet #21, Summer 1999

[9] Apple Rootstocks, Alaska Department of Natural Resources Archived 2008-07-19 at the Wayback Machine

[10] Biel, John. "Collecting and Training Crab Apples | American Bonsai Society". www.absbonsai.org. American Bonsai Society. Archived from the original on 3 July 2016. Retrieved 2 August 2016.

[11] "Crabapple (Malus) - Bonsai Empire". www.bonsaiempire.com. Retrieved 2 August 2016.

[12] Walston, Brent. "Crabapples for Bonsai". evergreengardenworks.com. Retrieved 2 August 2016.

[13] "AGM Plants - Ornamental" (PDF). Royal Horticultural Society. July 2017. p. 63. Retrieved 2 April 2018.

[14] "RHS Plantfinder - Malus 'Adirondack'". Retrieved 25 March 2018.

[15] "RHS Plantfinder - Malus 'Butterball'". Retrieved 25 March 2018.

[16] "Malus 'Comtesse de Paris'". RHS. Retrieved 6 January 2021.

[17] "RHS Plantfinder -Malus 'Evereste'". Retrieved 25 March 2018.

[18] "RHS Plantfinder - Malus Jelly King = 'Mattfru'". Retrieved 25 March 2018.

[19] "RHS Plantfinder - Malus 'Laura'". Retrieved 25 March 2018.

[20] "RHS Plantfinder - Malus × robusta 'Red Sentinel'". Retrieved 25 March 2018.

[21] "RHS Plantfinder - Malus 'Sun Rival'". Retrieved 25 March 2018.

[22] The Complete Guide to Edible Wild Plants. United States Department of the Army. New York: Skyhorse Publishing. 2009. p. 113. ISBN 978-1-60239-692-0. OCLC 277203364.{{cite book}}: CS1 maint: others (link)

[23] "The Growing Guide". Stark Bro's Nurseries & Orchards Co. Archived from the original on 2014-07-26.

[24] Rombauer, I.; Becker, M. R.; Becker, E. (2002) [2002]. All About Canning & Preserving (The Joy of Cooking series). New York: Scribner. p. 72. ISBN 0-7432-1502-8.

[25] "The Science of Cidermaking". Andrew Lea. Retrieved November 14, 2013.

[Fraser-26] Fraser, Anna (22 August 2005). "Properties of different trees as firewood". Retrieved 17 July 2008.

[27] Burks, Jeff (2015). "Woods Used in Saw Handles". Lost Art Press, Traditional Hand-tool Skills. blog.lostartpress.com.

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"Crabapple" or "Wild apple" (of the genus Malus)
Species, varieties and cultivars	Malus angustifolia (Southern) Malus asiatica (Chinese pearleaf) Malus baccata (Siberian) Malus bracteata Malus brevipes Malus coronaria (Sweet) Malus crescimannoi Malus doumeri Malus 'Evereste' Malus florentina Malus floribunda (Japanese) Malus fusca (Oregon/Pacific) Malus glabrata Malus glaucescens Malus halliana Malus honanensis Malus hupehensis (Tea) Malus ioensis (Prairie) Malus kansuensis Malus lancifolia Malus mandshurica (Manchurian) Malus niedzwetskyana Malus orientalis (Caucasian) Malus prattii Malus prunifolia Malus rockii Malus sargentii Malus sieboldii Malus sieversii (Asian wild/Almaty) Malus sikkimensis Malus spectabilis Malus sublobata Malus sylvestris (European wild) Malus toringoides Malus transitoria Malus trilobata Malus tschonoskii Malus yunnanensis
Topics	Apple Applecrab Malling series
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