Abstract: In this paper, the fruits morphological characteristics of 12 individual plants in the same population of Calligonum ebi-nuricums, which are growing in Jinghe of Xinjiang Province,are studied by numerical analysis. The results show that the morphological variation of 11 morphological traits, including length of beak, length of fruit, width of fruit, shape of fruit, length of achene, width of achene, shape of achene, length of bristle, the length of bristle of head, the distance between ribs and the distance between bristles, existed both within plant and amang plants, and the degree of variation within plant were lesser than amang plants. There is obvious correlation in indices of the fruits and the achene sizes(p＜0.01). However, the shape of achene and the distance between ribs are negatively correlated (r=-0.297**，p＜0.01), which means width of achene increases with the distance between ribs. It was concluded that the shape of the fruits and achenes could be used for species classification; and those characteristics with greater plasticity were less useful in distinguishing the sibling species with sympatric distribution. This result can be referred to classify of other species in Calligonum.

Key words: Calligonum ebi-nuricum, fruit morphology, intraspecific variations, plasticity