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Corylus heterophylla
''Corylus heterophylla'', the Asian hazel, is a species of hazel native to eastern Asia in northern and central China, Korea, Japan, and southeastern Siberia.〔Flora of China: (''Corylus heterophylla'' )〕
It is a deciduous shrub or small tree growing to 7 m tall, with stems up to 20 cm thick grey bark. The leaves are rounded, 4–13 cm long and 2.5–10 cm broad, with a coarsely double-serrated to somewhat lobed margin and an often truncated apex. The flowers are wind-pollinated catkins; the male (pollen) catkins are pale yellow, 4 cm long, while the female catkins are bright red and only 1–3 mm long. The fruit is a nut produced in clusters of 2–6 together; each nut is 0.7–1.5 cm diameter, partly enclosed in a 1.5–2.5 cm long, bract-like involucre (husk).〔〔Bean, W. J. (1976). ''Trees and Shrubs Hardy in the British Isles'' 8th ed., vol. 1. John Murray ISBN 0-7195-1790-7.〕
It is very similar to the closely related common hazel (''C. avellana'') of Europe and western Asia, differing in the leaves being somewhat more lobed.〔
==Uses==
The nut is edible, and is very similar to the common hazel nut; it is cultivated commercially in China.〔
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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