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¡¡¡¡¡¶ÖйúÖ²ÎïÖ¾(µÚ17¾í¡¤Ó¢ÎÄ°æ)¡·½²ÊöÁË£ºthe 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