Abstract:

Three populations of Paphiopedilum armeniacum in Yunnan region were surveyed based on 19 phenotypic traits including floral organs，leaves and so on. It was aimed at analyzing the phenotypic diversity among and within populations by some statistical analysis methods. The results showed that there were highly significant differences in phenotypic traits among and within populations. The mean of phenotypic differentiation coefficient（V_ST）was 53.02%，which meant that differentiation among populations was a bit larger than that within populations. The range of average variation coefficients（CV）about 19 phenotypic traits was 9.68%–26.36%. The average variation coefficients of three populations were 13.27%，15.85% and 14.96%，respectively. Therefore，the variation coefficients varied dramatically among phenotypic traits. Principal component analysis indicated that traits related to plant height，plant height and scape height，contributed to differences of plants mainly. Pearson correlation analysis showed that there were highly significant differences between tepals. Plant height and scape height were highly related to other traits，especially traits which were on behalf of the size of flower organs.

Key words: Paphiopedilum armeniacum, phenotypic, diversity