London planetree (Platanus x hispanica) is a hybrid cross between the American sycamore and Oriental planetree. The tree has been widely planted in cities all over Europe and America because it was perceived to have a tolerance for urban pollution. Compared to the sycamore, the London plane tree has leaves with deeper spaces between the leaf lobes and fruiting balls clustered in pairs rather than hanging as a single ball. Further, the mottling on London plane trees occurs on the entire tree while on a sycamore it does not occur at lower levels. The London plane tree typically grows to 75 to 100 feet with horizontal branching. The large three-to-five lobed medium-to-dark green leaves (4-9 in. wide) have coarse marginal teeth and turn brownish-yellow in the fall. The reddish female flowers give way to fuzzy, long-stalked, spherical fruiting balls (to 1 3/8 in. diameter) that ripen to brown in October and persist on the tree into early winter. Each fruiting ball consists of numerous, densely-packed, tiny seed-like fruits (achenes). The distinct bark of the London planetree is brownish with patches of white inner bark. There are many streets in Princeton, such as Hibben Road and Moore Street, where you can find rows of beautiful large London plane trees.