J Syst Evol ›› 1983, Vol. 21 ›› Issue (1): 34-43.
• Research Articles •
Xu Ke-Xue, Li De-Zhong
In this paper, 10 species and varieties of the genus Panax from China were
studied by means of numerical taxonomic methods. At first, the geometric approaches
and statistical treatments were used and some new characters induced by the fundamental characters were defined for the numerical representation of the morphological
characters of plants. Consequently, forty-seven morphological, three chemical, one geographical and one cytological characters were adopted. The principal component analysis and the similarity coefficients were computed on the standardized data. Based
upon the correlation matrix and the distance matrix respectively, the Q and R cluster
analyses were carried out, and UPGMA was used in both Q and R cluster analyses.
According to the R cluster analysis, all characters are mainly divided into 5 sets:
A, B, C, D and E (Fig. 2). The tree-like diagram illustrates that chemical constituents of triterpenoids and the chromosome numbers are related to some morphological
characters, such as the roots, the rhizomes, the seeds and the leaves. It is of interest to
note that the thicker the fleshy roots, the larger the seeds and the wider the teeth of
leaflet, the higher the content of the tetracyclic triterpenoids of dammarane type it
contains. On the other hand, the Q cluster analysis showed that Panax as a whole
may be divided into two groups (Fig. 3). The first group includes P. ginseng, P.
quinquefolius, P. notoginseng and P. zingiberensis and the second group includes P.
stipuleanatus, P. pseudo-ginseng, P. japonicus var. japonicus, P. japonicus var. angustifolius, P. japonicus var. major and P. japonicus var. bipinnatifidus. The results of
the computation of principal component analysis indicate that the first principal
component consistes of the characters occurring in the sets A and B. It shows that
the variation in Panax has two opposite directions. One of them, corresponding to the
set A, is represented by the first group, and the other, corresponding to the set B, is
by the second group. Finally, some questions about the use of the genus in medicine were discussed.
Xu Ke-Xue, Li De-Zhong. A Preliminary Research on the Numerical Classification of the Genus Panax from China[J]. J Syst Evol, 1983, 21(1): 34-43.
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