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There are 16 kinds of mulberry all over the world, distributing in the North Temperate Zone, the Asian tropics,
the African tropics and the American area. 11 kinds of them grow in China, distributing in most areas of the country,
major in Jiangsu, Zhejiang, and the southern areas for raising silkworms. Mulberry belongs to deciduous arbor,
with shrub form in common. The bark presents ochre color, and the branch in grey-white color,
with soft hairs when tender. The leaf is like oval, with length 5-10cm, maximum to 20cm. Unisexual flower,
in yellowish-green color, comes into bloom with leaf in the same tim
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