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�������Ї�ֲ��־(��17����Ӣ�İ�)���v���ˣ�the flora of china is the most diverse in the north temperate zone and is one of the richest in theworld.it includes some 8��500 species of trees and shrubs.china is the only country in the world thatincludes unbroken transitional zones connecting tropical��subtropical��temperate��and boreal forests.somegenera of vascular plants��e.g.��metasequoia��ginkgo��cercidiphyllum����which are known only as fossilsin europe and north america,have survived in china.therefore��knowledge of the flora of chinais essential for interpreting the fossil record and understanding the vegetational history of north america��europe��and elsewhere in asia��for protecting the plants adequately��for utilizing them well economically��and simply for learning the properties of a significant fraction of the world��s plants