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The Callery Pear (Pyrus calleryana) is a species of pear native to China. The leaves are oval, 4-7 cm long, glossy dark green above, slightly paler below. The flowers are produced in early spring before the leaves expand fully, and are white, with five petals, and about 2-3 cm diameter. The fruit is about 2 cm diameter, hard, almost woody until softened by frost, after which it is readily taken by birds, which disperse the seeds in their droppings. In summerSummer is one of the four temperate seasons. Astronomically, it begins with the summer solstice (around 21 June in the Northern hemisphere, and 21 December in the Southern hemisphere) and ends with the autumn equinox (around 21 September in the Northern h, the foliage is dark green and very smooth, and in autumnWestonbirt Arboretum, Gloucestershire, England. Autumn (also called fall in American English; in England that usage was once standard, but has now become archaic) is one of the four temperate seasons, the transition between summer and winter. In the tempe the leaves consistently turn brilliant colors, everything from yellow and orange to more common red, pink, purple, and bronze. Sometimes, several of these colors my be present on an individual leaf, and often the tree will turn from the outer top to the inner bottom, like a mapleSee also Maple computer algebra system''. Acer campestre Field Maple Acer ginnala Amur Maple Acer griseum Paperbark Maple Acer japonicum Fullmoon Maple Acer macrophyllum Bigleaf Maple Acer micranthum Garden Maple Acer negundo Manitoba Maple Acer palmatum.

1 Cultivation

It is widely planted throughout North AmericaNorth America is the third largest continent in area and the fourth ranked in population. It is bounded on the north by the Arctic Ocean, on the east by the North Atlantic Ocean, on the south by the Caribbean Sea, and on the west by the North Pacific Ocea as an ornamental tree. The natural symmetrySymmetry is a characteristic of geometrical shapes, equations and other objects; we say that such an object is symmetric with respect to a given operation if this operation, when applied to the object, does not appear to change it. The three main symmetri of several cultivarA cultivar is a cultivated variety of a plant species. Modern cultivars are often, but not necessarily, hybrids between species; they may equally well represent particularly desirable selections from populations of a single species. Cultivars generally ars lends to their use in somewhat formal settings, such as office parks or industrial parks. It is commonly planted for its decorative value, but its hard little fruits are taken by birds. Its beautiful white blossoms can be seen in early spring along the boulevards of many Eastern US towns. Unfortunately, when in flower, the Callery Pear produces a sickly-sweet smell that some have likened to decaying crab meat, or jasmine and dog vomit.

The Callery Pear is proving to be an invasive species in some areas of North America, pushing out native American plants and trees. Self-sown plants often differ from the selected cultivars in less regular shape, and also in frequently being densely thorny.

There are several cultivars in commerce:

• 'Aristocrat'
• 'Autumn Blaze'
• 'Bradford' (Bradford Pear, the most commonly planted cultivar)
• 'Capital'
• 'Cleveland Select'
• 'Fauriei'
• 'Redspire'
• 'Whitehouse'

Bradford pear in flower, Hemingway, South Carolina The neat dense upward growth of 'Bradford', which makes it desirable in cramped urban spaces, also results in a multitude of narrow weak crotches unless corrected by selective pruning at an early stage. These weak crotches make the Bradford Pear susceptible to winter damage where snowfall is heavy or when ice storms occur, or during the high winds of severe thunderstorms. Because of this, and the relatively short lifespan that results, many groups have discouraged their use in landscaping in favor of other stronger trees including other Callery Pear cultivars like 'Cleveland Select', but also more locally native tree species.