The c luster tree of g eneric a real-types of seed plants in 46 areas of China was given in the paper.The floristic relationship among different areas in China was also compared in the paper.

• 结果表明：在一定的经度范围内（中国东半部地区），两个地区植物区系之间的亲缘关系与其所处的纬度相关，即纬度相近其亲缘关系也相近，反之即疏远。