淫羊藿属植物的数量分类学研究

A Numerical Taxonomical Study of EpimediumL.

通过观测淫羊藿属植物的30个质量性状和15个数量性状,利用聚类分析和主成分分析的方法研究淫羊藿属属下类群的分类关系。结果表明:(1)聚类分析结果将淫羊藿属中国种类划分为大花类群和小花类群,支持Stearn对Sect.Macroceras、Sect.Polyphyllon和Subg.Rhizophyllum的处理,但认为Sect.Epimedium的分类地位尚需进一步探讨。(2)主成分分析结果显示,性状的累积贡献率不是很高,前3个主成分累积贡献率为51.86%,这可能与本属植物演化过程中性状变异的多样化和复杂化相关,但由主成分分析的结果仍可以看出中国种类被划分为大花类群和小花类群。研究认为,花瓣与内萼片长度比、花瓣是否具距、萼片轮数等作为主成分反映的性状对淫羊藿属分类具有重要价值。

Based on 30 qualitative and 15 quantitative characters of Epirnediurn, a numerical taxonomy is presented by using the cluster analysis and principal components analysis. Results of cluster analysis show that： （1）The genus can be divided into macro-flowered taxon and micro-flowered taxon. The treatment of Sect. Macroceras,Sect. PolyphyZlon and Subg. Rhizophyllurn by Stearn is supported, and the taxonomic status of Sect. Epimedium is doubted. （2）In principal components analysis, cumulative ratio of the first three principal components is only 51.86 %, and this is probably related to diversified variation and taxonomic complication in Epirnedium evolution. However,the result of principal components analysis also indicates the generic division of macro-flowered and micro-flowered taxon. These important characters in Epirnedium resulted from principal component analysis, such as ratio of petal length to inner sepal length, spur,whorls of sepal,are valuable for tnYnnnm,, nf th;