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''Juglans regia'', Persian walnut, English walnut, or especially in Great Britain, common walnut, is an Old World walnut tree species native to the region stretching from the Balkans eastward to the Himalayas and southwest China. The largest forests are in Kyrgyzstan, where trees occur in extensive, nearly pure walnut forests at 1,000–2,000 m altitude〔Hemery 1998〕—notably at Arslanbob in Jalal-Abad Province. It is widely cultivated across Europe. ==Description== ''Juglans regia'' is a large, deciduous tree attaining heights of 25–35 m, and a trunk up to 2 m diameter, commonly with a short trunk and broad crown, though taller and narrower in dense forest competition. It is a light-demanding species, requiring full sun to grow well. The bark is smooth, olive-brown when young and silvery-grey on older branches, and features scattered broad fissures with a rougher texture. Like all walnuts, the pith of the twigs contains air spaces; this chambered pith is brownish in color. The leaves are alternately arranged, 25–40 cm long, odd-pinnate with 5–9 leaflets, paired alternately with one terminal leaflet. The largest leaflets are the three at the apex, 10–18 cm long and 6–8 cm broad; the basal pair of leaflets are much smaller, 5–8 cm long, with the margins of the leaflets entire. The male flowers are in drooping catkins 5–10 cm long, and the female flowers are terminal, in clusters of two to five, ripening in the autumn into a fruit with a green, semifleshy husk and a brown, corrugated nut. The whole fruit, including the husk, falls in autumn; the seed is large, with a relatively thin shell, and edible, with a rich flavour. File:Juglans_regia_-_Köhler–s_Medizinal-Pflanzen-081.jpg|Taxonomic keys File:Walnuss_Blüte.jpg|Male flower File:Juglans flower female 20050526 064.jpg|Female flower File:Juglans regia 2009 G2.jpg|Fruit File:Juglans regia Echte Walnußfrucht 3.JPG|Seed File:Walnussrinde-alt.jpg|Bark File:Juglans-regia.JPG|Foliage File:Walnussbaum-alt.jpg|Habit File:Juglans regia autumn 2009.jpg|Habit (autumn) File:Walnuts2.jpg|Walnuts 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「Juglans regia」の詳細全文を読む スポンサード リンク
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