Abstract: The morphological variations of 7 Rhododendron concinnum wild populations in Qinling Mountains were investigated. The results showed that there was certain but not significant morphological variation existing among natural populations and within the population in seven different regions of R.concinnum. The average coefficient of variation of each characteristic ranged from 0 (stamen number) to 0.28 (pedicel length), while among populations ranged from 0.08 (Zhouzhi)-0.14 (Nanzhen). Variation of flower color traits was high at species level and low at population level. The correlation analysis between the phenotypic traits of R.concinnum and geography ecological factor showed that the correlation was not significant. According to the UPGMA cluster analysis based on the Euclidean distance, 7 R.concinnum wild populations could be divided into three groups.

Key words: Qinling Mountains, Rhododendron concinnum, phenotypic variation, population