Morphological diversity of wilding population in Medicago ruthenica from different origin.

By using the method of numerical statistics,morphological variation of Medicago ruthenica has been studied.The results show:inter-/intro-population variation occurred remarkably in most morphological characters except for numbers of length of leaf,pod length,pod width,pod shape,seed length and 1 000-seed weight.Based on the 14 morphological characters,cluster analysis showed that,14 populations of Medicago ruthenica have been divided into 4 parts.Principal component analysis showed that five characters including plant height,area of leaf,number of flowers/pod,number of seeds/raceme and seed width are mainly factors which produced morphological variation of Medicago ruthenica.