High Quality Content by WIKIPEDIA articles! Corylus heterophylla, the Asian Hazel, is a species of hazel native to eastern Asia, from northern China, eastern Mongolia, Korea, Japan, and southeastern Siberia. 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 2.5-10cm 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.

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