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| Caucasian walnut ： ウィキペディア英語版 |
Pterocarya fraxinifolia
''Pterocarya fraxinifolia'' is a species of tree in the Juglandaceae family. It is commonly known as the Caucasian wingnut or Caucasian walnut. It is native to the Caucasian region Armenia, Azerbaijan, Georgia, Iran, Russia, the Ukraine and Turkey. It was introduced to France in 1784, and to Great Britain after 1800.
==Description==
The tree is monoecious and grows to a height of < 30 m, the short, thick bole supporting widely spreading branches to form a rounded structure not unlike the Wych Elm. The pinnate leaves can exceed 60 cm in length, comprising 7 - 27 sessile leaflets. The flowers appear in April, the male catkins thick and green, 7.5 - 12.5 cm long, the females longer with less dense flowers, bearing red styles forming fruiting catkins 30 – 50 cm long, the green, winged, nuts approximately 1.8 cm wide.〔Phillips, R. (1978). ''Trees in Britain, Europe & North America''. Pan Books, London.〕
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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