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''Forsythia'' (〔''Sunset Western Garden Book,'' 1995:606–607〕 or ) is a genus of flowering plants in the family Oleaceae (olive family). There are about 11 species, mostly native to eastern Asia, but one native to southeastern Europe.〔(Kew World Checklist of Selected Plant Families )〕 The common name is also forsythia; the genus is named after William Forsyth.〔Flora of China: (''Forsythia'' )〕〔Flora Europaea: (''Forsythia'' )〕〔St Andrews Botanic Garden: (Plant of the Month: ''Forsythia'' )〕 ==Description== ''Forsythia'' are deciduous shrubs typically growing to a height of and, rarely, up to with rough grey-brown bark. The leaves are borne oppositely and are usually simple, though sometimes trifoliate with a basal pair of small leaflets; they range between in length and, rarely, up to , with a margin that is serrated or entire (smooth). The flowers are produced in the early spring before the leaves, bright yellow with a deeply four-lobed flower, the petals joined only at the base. These become pendant in rainy weather thus shielding the reproductive parts. It is widely stated that forsythia flowers are able to produce lactose (the milk sugar). Lactose is very rarely established in other natural sources except milk. However, the presence of lactose could not be confirmed.〔Toba, T., Nagashima, S. and Adachi, S. (1991), Is lactose really present in plants?. Journal of the Science of Food and Agriculture, 54: 305–308. 〕 The actual fruit is a dry capsule, containing several winged seeds.〔〔Huxley, A., ed. (1992). ''New RHS Dictionary of Gardening''. Macmillan ISBN 0-333-47494-5.〕 The genus is named after William Forsyth (1737–1804), a Scottish botanist who was royal head gardener and a founding member of the Royal Horticultural Society.〔(Forsythia ) by Green Deane at Eat the Weeds. Accessed April 2013〕 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「Forsythia」の詳細全文を読む スポンサード リンク
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