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whitebeam
The whitebeams are members of the Rosaceae family, comprising subgenus ''Aria'' of genus ''Sorbus'', and hybrids involving species of this subgenus and members of subgenera ''Sorbus'', ''Torminaria'' and ''Chamaemespilus''. They are deciduous trees with simple or lobed leaves, arranged alternately. They are related to the rowans (''Sorbus'' subgenus ''Sorbus''), and many of the endemic restricted-range apomictic microspecies of whitebeam in Europe are thought to derive from hybrids between ''S. aria'' and the European rowan ''S. aucuparia''; some are also thought to be hybrids with the wild service tree ''S. torminalis'', notably the service tree of Fontainebleau ''Sorbus latifolia'' in French woodlands.
The best known species is the common whitebeam ''Sorbus aria'', a columnar tree which grows to tall by broad, with clusters of white flowers in spring followed by speckled red berries in autumn (fall).
==Appearance==
The surface of the leaf is an unremarkable mid-green, but the underside is almost white (hence the name) transforming the appearance of the tree in strong winds, as noted by the poet Meredith: "flashing as in gusts the sudden-lighted whitebeam".〔(Meredith, G. (1851). Love in the valley. Line 207. ''Poems'' )〕 It is also described as the "wind-beat whitebeam" in Gerard Manley Hopkins' poem "The Starlight Night".〔(Hopkins, Gerard Manley (1918). The starlight night. Line 6. )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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