Abstract: Based on our Investigations for endangered Cypripedium wild resource in North and
Northeast China，38 representative samples were studied by Q model cluster analysis of numerical
taxonomy，and 20 typical morphological characters were studied in R-model cluster analysis and the
principal component analysis to establish the complete Cypripedium classification system. Q-model cluster
analysis indicated that the 38 samples were separated into two groups：C. shanxience series group（group
A）and the other Cypripedium group（group B）at Lq1 = 0.25；and the group B were separated into three
subgroups at Lq2 = 0.155. It has showed there are nature hybrids between C. macranthos and C. calceolus.
R-model cluster analysis indicated that most of selected morphological characters were independent from
each other. The principal component analysis suggested that 20 characters can be combinated to 9 main
components，and the cumulative contribution rate of the top five main components have arrived as much as
80.81%，13 dominate characteristics among 20 were selected for their important influence.

Key words: orchidaceae, Q-model cluster analysis, R-model cluster analysis, principal component analysis