|Malus ‘Purple Prince'|
Malus (/ˈmeɪləs/ or /ˈmæləs/) is a genus of about 30–55 species of small deciduous trees or shrubs in the family Rosaceae, including the domesticated orchard apple, crab apples and wild apples.
The genus is native to the temperate zone of the Northern Hemisphere.
Apple trees are typically 4–12 metres (13–39 feet) talI 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).
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.
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.
Several Malus species, including domestic apples, hybridize freely.
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.
32 species and hybrids are accepted.  The genus Malus is subdivided into eight sections (six, with two added in 2006 and 2008). 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.
|Image||Scientific name||Common name||Distribution|
|Malus angustifolia (Aiton) Michx.||Southern crabapple||Eastern and south-central United States from Florida west to eastern Texas and north to New Jersey, Pennsylvania, Illinois, and Missouri|
|Malus coronaria (L.) Mill.||Sweet crabapple||Great Lakes Region and in the Ohio Valley, United States|
|Malus ioensis (Alph.Wood) Britton||Prairie crabapple||Upper Mississippi Valley, United States|
|Malus brevipes (Rehder) Rehder||Shrub apple|
|Section Docyniopsis Schneid.||Malus doumeri (Bois) A.Chev.||Taiwan crabapple||China (Guangdong, Guangxi, Guizhou, Hunan, Jiangxi, Yunnan, Zhejiang), Taiwan, Laos, Vietnam|
|Malus leiocalyca S. Z. Huang||China (Anhui, Fujian, Guangdong, Guangxi, Hunan, Jiangxi, Yunnan, Zhejiang)|
|Malus tschonoskii (Maxim.) C.K.Schneid.||Chonosuki crabapple and pillar apple||Japan|
|Section Eriolobus (Seringe) Schneid||Malus trilobata (Poir.) C.K.Schneid.||Lebanese wild apple, erect crabapple, or three-lobed apple tree||Asia includes West and South Anatolia, Syria, Lebanon, and North Palestine, Europe from east section of Greek Thrace (Evros Prefecture) and southeastern Bulgaria|
|Section Florentinae (Rehder) M.H.Cheng ex G.Z.Qian||Malus florentina (Zucc.) C.K.Schneid.||Florentine crabapple, hawthorn-leaf crabapple||Balkan Peninsula and Italy|
|Section Gymnomeles Koehne||Malus baccata (L.) Borkh. 1803||Siberian crabapple||Russia, Mongolia, China, Korea, Bhutan, India, and Nepal|
|Malus halliana Koehne 1890||Hall crabapple||Japan and China|
|Malus hupehensis (Pamp.) Rehder 1933||Tea crabapple||China|
|Malus mandshurica (Maxim.) Kom. ex Skvortsov||Manchurian crabapple||China, Japan, eastern Russia|
|Malus sikkimensis Wenz.) Koehne ex C.K.Schneid.||Sikkim crabapple||China, Nepal, Bhutan, and India|
|Malus spontanea (Makino) Makino||Japan|
|Section Malus Langenfelds||Malus asiatica Nakai||Chinese pearleaf crabapple||China and Korea|
|Malus chitralensis Vassilcz.||Chitral crab apple||India, Pakistan|
|Malus crescimannoi Raimondo||North-eastern Sicily|
|Malus floribunda Siebold ex Van Houtte||Japanese flowering crabapple||Japan and East Asia|
|Malus muliensis T.C.Ku||China (Sichuan)|
|Malus orientalis Uglitzk.||Armenia, Georgia, Turkey, and Russia|
|Malus prunifolia (Willd.) Borkh.||Plum-leaf crabapple, Chinese crabapple||China|
|Malus domestica Miller, 1768||Orchard apple, includes Malus niedzwetzkyana and M. pumila||Central Asia (mountains of Kazakhstan)|
|Malus sieversii (Ledeb.) M.Roem.||Southern Kazakhstan|
|Malus spectabilis (Aiton) Borkh.||Asiatic apple, Chinese crabapple||China (Hebei, Jiangsu, Liaoning, Qinghai, Shaanxi, Shandong, Sichuan, Yunnan, and Zhejiang)|
|Malus sylvestris (L.) Mill.||European crabapple||Europe|
|Malus zhaojiaoensis N.G.Jiang||Zhaojiao crab apple||China (Sichuan)|
|Section Sorbomalus Zabel||Malus fusca (Raf.) C.K.Schneid.||Oregon or Pacific crabapple||Western North America from Alaska, through British Columbia, to northwestern California|
|Malus kansuensis (Batalin) C. K. Schneider||Calva crabapple||China (Gansu, Henan, Hubei, Shaanxi, Sichuan)|
|Malus komarovii (Sarg.) Rehder||China, Manchuria, and North Korea|
|Malus sargentii Rehder.||Sargent crabapple||Japan|
|Malus toringo (Siebold) de Vriese||Toringo crabapple or Siebold's crabapple||Eastern temperate Asia, in China, Japan, and Korea|
|Malus toringoides Hughes||Cut-leaf crabapple||China (Shaanxi, Gansu, Ningxia, Qinghai, and Sichuan)|
|Malus transitoria C.K.Schneid.||Cut-leaf crabapple||China (Gansu, Nei Mongol, Qinghai, Shaanxi, Sichuan, E Xizang)|
|Malus × zumi (Matsum.) Rehder||Japan (Honshu)|
|Section Yunnanenses (Rehd.) G.Z.Qian||Malus honanensis Rehder.||Honan Crabapple||China (Gansu, Hebei, Henan, Hubei, Shaanxi, Shanxi)|
|Malus ombrophila Handel-Mazzetti||China (Sichuan, Xizang,Yunnan)|
|Malus prattii (Hemsl.) C.K.Schneid.||Pratt's crabapple||China (Guangdong, Guizhou, west Sichuan, and northwest Yunnan)|
|Malus yunnanensis C.K.Schneid.||Yunnan crabapple||China (Yunnan)|
See also: Fruit tree pollination
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.
Some crabapples are used as rootstocks for domestic apples to add beneficial characteristics. 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.
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.
Because of the plentiful blossoms and small fruit, crabapples are popular for use in bonsai culture.
These cultivars have won the Royal Horticultural Society's Award of Garden Merit:-
Other varieties are dealt with under their species names.
The seeds contain cyanide compounds.
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.
Some crabapple varieties are an exception to the reputation of being sour, and can be very sweet, such as the 'Chestnut' cultivar.
Crabapples are an excellent source of pectin, and their juice can be made into a ruby-coloured preserve with a full, spicy flavour. A small percentage of crabapples in cider makes a more interesting flavour. 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. It is easier to cut when green; dry applewood is exceedingly difficult to carve by hand. It is a good wood for cooking fires because it burns hot and slow, without producing much flame. 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.
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