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Sorbus × houstoniae
''Sorbus × houstoniae'', Houston's whitebeam, or , is a hybrid of two deciduous trees, the common whitebeam (''Sorbus aria'') and the Bristol whitebeam (''Sorbus bristoliensis''). Only a single example of the hybrid is known to exist, at the Avon Gorge in Bristol, England.〔 The only specimen grows on a cliff below Stokeleigh Camp at Leigh Woods in North Somerset and cannot be accessed without ropes.〔
== Description ==
The specimen is a small tree, at least 5 metres in height. Buds are oval to conical.〔 The leaves of Houston's whitebeam have a similarity to those of Bristol whitebeam, although they are wider.〔 The leaves are teardrop-shaped to teardrop-oval, and about 1.5 times as long as wide, with an apex that tapers to a long point and a base that is relatively wide. The leaves are shallowly, acutely lobed, 7–14% of the way to the central vein. The leaf margins are weakly doubly serrate. The upper surface is dark green and hairless, the lower greenish-white with matted plant hairs and between 17 and 22 veins that project at an angle of 32 to 39 degrees from the central vein. The petioles are 8 to 20 mm in length. The inflorescence measures up to 8 cm in diameter, with individual flowers 16–18 mm in diameter. The fragrant flowers have sepals that are narrow and triangular, and white petals that are widely oval to nearly round, 5.5–7.5 x 5.5–6 mm. The stamens are pink.〔 The fruit are generally round, the largest up to 15 mm in diameter; mature fruit are orange-red with fully formed seeds.〔〔 There is a moderate number of lenticels.〔
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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