page_title: Platanus
section_title: Botany
hierarchical_section_title: Platanus / Botany
caption_attribution_description: English: Close up of a ripe plane tree fruit on the ground, under the tree.
context_page_description: Platanus is a genus consisting of a small number of tree species native to the Northern Hemisphere. They are the sole living members of the family Platanaceae.
  All members of Platanus are tall, reaching 30–50 m in height. All except for P. kerrii are deciduous, and most are found in riparian or other wetland habitats in the wild, though proving drought-tolerant in cultivation. The hybrid London plane has proved particularly tolerant of urban conditions, and has been widely planted in London and elsewhere in the United Kingdom.
  They are often known in English as planes or plane trees. Some North American species are called sycamores, although the term sycamore also refers to the fig Ficus sycomorus, the plant originally so named, and to the sycamore maple Acer pseudoplatanus. The genus name Platanus comes from Ancient Greek πλάτανος, which referred to Platanus orientalis.
context_section_description: The flowers are reduced and are borne in balls (globose heads); 3–7 hairy sepals may be fused at the base, and the petals are 3–7 and are spatulate. Male and female flowers are separate, but borne on the same plant (monoecious). The number of heads in one cluster (inflorescence) is indicative of the species (see table below). The male flower has 3–8 stamens; the female has a superior ovary with 3–7 carpels. Plane trees are wind-pollinated. Male flower-heads fall off after shedding their pollen.
  After being pollinated, the female flowers become achenes that form an aggregate ball. The fruit is a multiple of achenes  (plant systematics, Simpson M. G., 2006).  Typically, the core of the ball is 1 cm in diameter and is covered with a net of mesh 1 mm, which can be peeled off. The ball is 2.5–4 cm in diameter and contains several hundred achenes, each of which has a single seed and is conical, with the point attached downward to the net at the surface of the ball. There is also a tuft of many thin stiff yellow-green bristle fibers attached to the base of each achene. These bristles help in wind dispersion of the fruits as in the dandelion.
  The leaves are simple and alternate. In the subgenus Platanus  they have a palmate outline. The base of the leaf stalk (petiole) is enlarged and completely wraps around the young stem bud in its axil. The axillary bud is exposed only after the leaf falls off.
  The mature bark peels off or exfoliates easily in irregularly shaped patches, producing a mottled, scaly appearance. On old trunks, bark may not flake off, but thickens and cracks instead.
caption: Ripe plane tree fruit
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