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''Acer davidii'' (Père David's Maple), is a species of maple in the snakebark maple group. It is native to China, from Jiangsu south to Fujian and Guangdong, and west to southeastern Gansu and Yunnan.〔Flora of China (draft): (Aceraceae )〕 The tree was originally discovered by Basque priest Armand David who was in Central China as a missionary. It was re-discovered by Charles Maries during his visit to Jiangsu in 1878. It is a small deciduous tree growing to 10–15 m tall with a trunk up to 40 cm in diameter, though usually smaller and often with multiple trunks, and a spreading crown of long, arching branches. The bark is smooth, olive-green with regular narrow pale vertical stripes on young trees, eventually becoming dull grey-brown at the base of old trees. The leaves are 6–18 cm long and 4–9 cm broad, with a petiole 3–6 cm long; they are dark green above, paler below, ovate, unlobed or weakly three-lobed, with a serrated margin. They turn to bright yellow, orange or red in the autumn. The flowers are small, yellow, with five sepals and petals about 4 mm long; they are produced on arching to pendulous 7–12 cm racemes in late spring, with male and female flowers on different racemes. The samara nutlets are 7–10 mm long and 4–6 mm broad, with a wing 2–3 cm long and 5 mm broad.〔〔Rushforth, K. (1999). ''Trees of Britain and Europe''. Collins ISBN 0-00-220013-9.〕〔van Gelderen, C. J. & van Gelderen, D. M. (1999). ''Maples for Gardens: A Color Encyclopedia''.〕 ==Subspecies and cultivars== There are two subspecies,〔〔 often treated as a distinct species:〔〔Mitchell, A. F. (1974). ''A Field Guide to the Trees of Britain and Northern Europe''. Collins ISBN 0-00-212035-6〕 *''Acer davidii'' subsp. ''davidii''. Père David's Maple. Bark greenish-brown with white stripes. Shoots pinkish-green. Leaf petiole pink to red; leaf margin usually single-serrate with variably-sized serrations. *''Acer davidii'' subsp. ''grosseri'' (Pax) de Jong. Hers's Maple (''Acer grosseri'' Pax; syn. ''Acer hersii'' Rehd.).〔(RHS Plant Selector Acer grosseri var. hersii AGM / RHS Gardening )〕 Bark green with white to pale green stripes. Shoots green. Leaf petiole green; leaf margin more often three-lobed and double-serrate. Along with ''A. rufinerve'', the two subspecies of Père David's Maple are among the most commonly cultivated snakebark maples. Both are relatively hardy and fast-growing.〔 Among the cultivars of ''A. davidii'' are:- *'Canton' (a Dutch cultivar with a purplish hue to its green stripes) *'George Forrest' (a Scottish cultivar with large leaves and dark red young shoots - this cultivar has gained the Royal Horticultural Society's Award of Garden Merit)〔(【引用サイトリンク】url=http://apps.rhs.org.uk/plantselector/plant?plantid=20 )〕 *'Ernest Wilson' (a specimen of which may be viewed in the Westonbirt Arboretum in England) *'Serpentine' (a cultivar with distinctively small, narrow leaves)〔〔〔(Royal Horticultural Society Plant Selector ''Acer davidii'' 'Serpentine' AGM / Royal Horticultural Society Gardening )〕 In some cases, these cultivars cannot be assigned to one subspecies or the other but are simply considered cultivars of ''A. davidii''.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Acer davidii」の詳細全文を読む スポンサード リンク
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