卫矛科沟瓣属与卫矛属的数量分类学研究

卫矛属(Euonymus L.)和沟瓣属(Glyptopetalum Thw.)的系统关系长期以来备受争议,为理清它们之间的关系,该研究选择沟瓣属12种、卫矛属17种和假卫矛属(Microtropis Wall. ex Meisn.)2种,共计31个分类单元(OTUs),测量并统计了56个形态性状,同时利用聚类分析(UPGMA)和主坐标分析(PCoA)的方法进行了数量分类学研究。结果表明:沟瓣属与卫矛属具有较高的表征相似性,二者之间存在的过渡类群有缙云卫矛(Euonymus chloranthoides Yang)和淡绿叶卫矛(E. pallidifolium Hayata)以及海南沟瓣 Glyptopetalum fengii (Chun & F. C. How)Ding Hou]、白树沟瓣 G. geloniifolium(Chun & F. C. How)C. Y. Cheng]。该研究认为将沟瓣属作为卫矛属的一个组,即沟瓣组(Sect. Glyptopetalum),放在冬青卫矛组(Sect. Ilicifolia)附近更为合理。对性状的主坐标排序分析显示,叶片长度、叶片宽度、叶侧脉数目、花瓣数目、心室数目、每室胚珠数、花序分枝数、是否具有假种皮、蒴果是否开裂、花期与果序梗长度在卫矛属分类中具有重要的价值。

A numerical taxonomic analysis of Glyptopetalum and Euonymus (Celastraceae)

The systematic relationship between the genera Euonymus L. and Glyptopetalum Thw. has been controversial for a long time. In order to clarify it, we selected 31 operational taxonomic units(OTUs)(12 from Glyptopetalum, 17 from Euonymus, and 2 from Microtropis Wall. ex Meisn.), measured 56 morphological characters of them, and performed cluster analysis(unweighted pair group method using arithmetic average)as well as principal coordinate analysis. The results were as follows: Glyptopetalum and Euonymus had a high morphological similarity, between which were some transition groups, e. g. Euonymus chloranthoides Yang, E. pallidifolius Hayata, Glyptopetalum fengii (Chun et F. C. How)Ding Hou, and G. geloniifolium(Chun et F. C. How)C. Y. Cheng. The study suggested that it is more reasonable to place Glyptopetalum as Euonymus Sect. Glyptopetalum, near Euonymus Sect. Ilicifolia. The principal coordinate analysis(PCoA)showed the great taxonomic value of some characters in Euonymus, including leaf blade length and width, number of lateral veins, petals, locules, ovules per locule, inflorescence branches, presence/absence of aril, dehiscence of capsule, flowering time, and infructescence stalk length.