Acanthopanax branchypus is a species of endangered plant peculiar to China,only distributing in loess plateau.Diffusion pattern and morphological plasticity of A.branchypus clone and ages of ramet were investigated in the natural distribution region in southern Nanniwan town,Yan 'an City,Shaanxi Province.10 plots were randomly set in two habitats of open land and Quercus liaotungensis forest.Each plot area was 5×5 m\+2,on the basis of previous observation of the maximum rhizome length.Detailed inf...