Editing Platanaceae (section)

== Hybrids ==
[[File:Platanus orientalis bark on trunk 02.jpg|thumb|left|Bark of ''P. orientalis'']]
The London plane or hybrid plane has long been considered a hybrid derived from the cross between ''P. occidentalis'' and ''P. orientalis'', despite this its origin is not clear. Some experts think it originated in London and others in Spain or even in natural or cultivated hybrid form (or not) in Turkey. The question has not been investigated with modern molecular methods. As a consequence, even its nomenclature is hotly debated, to the extent that until recently, some anglophone authors denied the priority of the name used by [[Otto von Münchhausen]] (following Maria da Luz de Oliveira Tavares Monteiro da Rocha Afonso, 1990, see References). The plant is not found in the wild, though it appears in a [[naturalisation (biology)|naturalised]] form along the banks of rivers and streams.

Hybrid ''[[Platanus × hispanica]]'' <small> [[Philip Miller|Mill.]] ex [[Otto von Münchhausen|Münchh.]], 1770</small> (= ''P. orientalis'' var. ''acerifolia'' <small>[[William Aiton|Aiton]], 1789</small>; ''P. hybrida'' <small>[[Félix de Avelar Brotero|Brot.]], 1804</small>; ''P. vulgaris'' <small>[[Édouard Spach|Spach]], 1841, ''nom. illeg.''</small>; ''P. × acerifolia''.

Other names proposed for hybrids that are probably synonymous with the above, which is the only name in English, and which represent smaller minorities are:
* Hybrid ''Platanus'' × ''cantabrigensis'' <small>[[A.Henry]], 1919</small>
* Hybrid ''Platanus'' × ''parviloba'' <small>[[Augustine Henry|A.Henry]], 1919</small>

The references consulted do not agree as to whether the fruit is a nucule or [[achene]], the difference between the two ultimately depends on the size of the pericarp and the extent of its lignification. The fruit is dry, indehiscent, monocarpelar and monospermatic.