|
''Acer buergerianum'' (Trident Maple; ) is a species of maple native to eastern China (from Shandong west to southeastern Gansu, south to Guangdong and Taiwan, and southwest to Sichuan) and Japan.〔Flora of China (draft): (Aceraceae )〕〔Germplasm Resources Information Network: (''Acer buergerianum'' )〕 ==Description== It is a small to medium-sized deciduous tree reaching a height of 5–20 m with a trunk up to 50 cm diameter. The leaves are in opposite pairs, 2.5–8 cm long (excluding the 2–5 cm petiole) and 3.5–6.5 cm broad, hard, glossy dark green above, paler below, usually with three lobes; on mature trees the lobes forward-pointing and with smooth margins, on young trees with more spreading lobes and serrated margins. The flowers are produced in spring, yellow-green, in pendulous corymbs; they are small, with five greenish sepals and five yellow-white petals about 2 mm long, and eight stamens. The fruit is a samara with two winged seeds, each seed 4–7 mm diameter, with a 15 mm wing; the wings are forward-pointing and often overlapping each other.〔〔van Gelderen, C.J. & van Gelderen, D.M. (1999). ''Maples for Gardens: A Color Encyclopedia''〕〔Rushforth, K. (1999). ''Trees of Britain and Europe''. Collins ISBN 0-00-220013-9.〕 The species is variable, and a number of varieties have been described:〔 *''Acer buergerianum'' var. ''buergerianum''. Hubei, Hunan, Jiangsu, Jiangxi, Shandong, Zhejiang. *''Acer buergerianum'' var. ''jiujiangense'' Z.X.Yu. Jiangxi. *''Acer buergerianum'' var. ''horizontale'' F.P.Metcalf. Southern Zhejiang. *''Acer buergerianum'' var. ''formosanum'' (Hayata ex Koidzumi) Sasaki. Taiwan (endemic). *''Acer buergerianum'' var. ''kaiscianense'' (Pampanini) W.P.Fang. Gansu, Hubei, Shaanxi. *''Acer buergerianum'' var. ''yentangense'' W.P.Fang & M.Y.Fang. Zhejiang. A few trees have consistently unlobed leaves; these were first described as a variety ''A. trifidium'' var. ''integrifolium'' Makino (''A. trifidium'' is an old synonym of ''A. buergerianum''), but are now not distinguished from the species.〔Makino Herbarium, Tokyo: (''Acer trifidium'' )〕 Occasional unlobed leaves also occur on most trees with otherwise normal three-lobed leaves.〔Mitchell, A. F. (1974). ''A Field Guide to the Trees of Britain and Northern Europe''. Collins ISBN 0-00-212035-6〕 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 buergerianum」の詳細全文を読む スポンサード リンク
|