Laticorymbus might be originated in the yunnan - guzhou plateau , and then migrated southeastwards to the south areas of the chanfjiang river . the tetraploid cytoype of var . scaberulus might originate in eastern china , expanding northwestwards to the yunnan - guzhou plateau and sishun 宽伞变种6x细胞型起源于云贵高原，并由西向东传播，广布于长江以南地区，微糙变种4x细胞型在华东地区起源，山东向西扩散至云贵高原和四川。
2.
3 . the correlation between the precipitation total for meiyu and the summerly precipitation in sichuan ( the areas of southeast china along sea ) are negative . in the years of much precipitation total for meiyu , the center of anticorrelation lies in chengdu ( fuzhou ) ; and in the years of less precipitation total for meiyu , the center of nagative correlation extends southeastwards from chengdu , and in the areas of southeast china along sea , the center of nagative correlation also lies in fuzhou 3长江中、下游地区梅雨量与四川盆地、东南沿海地区夏季降水也存在显著的负相关联系；四川盆地多梅雨年相关中心在成都附近，少梅雨年相关中心推向东南方向的乐山附近；东南沿海地区负相关中心多、少梅雨年份均在福州附近。
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