Pollen Allergy in a Changing World by Jae-Won Oh

Author:Jae-Won Oh
Language: eng
Format: epub, pdf
Publisher: Springer Singapore, Singapore

5.3.1.8 Family Platanaceae

(1)Plane Tree, American Sycamore, Maple Leaf Sycamore

Plane tree is easily recognized by the bark, which exfoliates in large flakes, is renowned as a street tree, particularly in Europe. The origin of this hybrid is uncertain. It is found planted from southern and central Europe to western Asia, North America, South Africa, Australia and New Zealand, especially in urban areas. In America the tree probably crossed with a native variety and thus looks different from the European species. Over half of the trees on London streets are Plane trees, and called London plane tree.

The plane tree is wind-pollinated and a large deciduous tree in a spreading form, with heavy, slightly drooping branches, reaching 21–30 m in height, and normally with a single stem clear of branches to a considerable height. The bark is mottled cream, gray, olive, and light-brown and usually but not always flakes in patches, creating a dappled appearance. The trunk may look rugged. The triangular-ovate “maple-like” leaf is medium- to dark-green, paler on the underside, and mat to glossy on the top (Fig. 5.35a–c). The leaves turn yellow-brown in autumn. The green flowers are monoecious and appear in April in the Northern Hemisphere.

Fig. 5.35(a) Trees, (b) catkins, (c) bark of Eastern sycamore (Platanus occidentalis)

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