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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 (), which are leaves belonging to the species Malus collardii and Malus kingiensis from western North America (Idaho) and the Russian Far East (), respectively.
The wild apple is a deciduous small to medium-sized tree, but can also grow into a multi-stemmed bush. It can live 80–100 years and grow up to 14 metres (46 feet) tall with trunk diameters of usually 23–45 centimetres (9– 17 + 1 ⁄ 2 inches), although diameters exceeding 90 cm (35 in) have been recorded. [ 2 ]
Malus floribunda forms a round-headed, deciduous tree up to 12 m (39 ft) in height, with narrow leaves on arching branches. The flowers, appearing in spring, are white or pale pink, opening from crimson buds. The red or yellow fruit is about 1 cm in diameter, ripening in autumn. [5]
Malus florentina is a species of apple known by the common names Florentine crabapple and hawthorn-leaf crabapple. It is native to the Balkan Peninsula and Italy , and it is grown elsewhere as an ornamental tree .
Malus ioensis, known as the Iowa crab or prairie crabapple, is a species of crabapple tree native to the United States. The most common variety , M. ioensis var. ioensis , is found primarily in the prairie regions of the upper Mississippi Valley .
Fruit. Malus fusca is a deciduous tree growing up to 13 metres (43 feet) tall, with a trunk 20–25 centimetres (8–10 inches) thick. [2] The leaves are 5–8 cm (2–3 in) long, dark green above, and both pale and fibrous beneath; they turn bright orange to red in autumn.
Malus baccata is an Asian species of apple known by the common names Siberian crab apple, [2] Siberian crab, [3] Manchurian crab apple and Chinese crab apple. [ 4 ] [ 5 ] [ 6 ] It is native to many parts of Asia, but is also grown elsewhere as an ornamental tree and for rootstock .
Its fruit is the largest of any species of Malus except domestica, up to 7 cm in diameter, equal in size to many modern apple cultivars. Unlike domesticated varieties, its leaves go red in autumn: 62% of the trees in the wild do this compared to only 2.8% of the regular apple plant or the 2,170 English cultivated varieties.
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