小蜡种下分类群的分类学研究

本文对小蜡Ligustrum sinense Lour.各变种进行了形态和地理分布的研究,结合扫描电镜观察其种子表皮和花药药壁的微观形态特征,并用数值方法进行数据处理,结果表明:过去称为“var.coryanum”后又归入var.opienense的贵州、广西标本实则与这两个变种有明显的差异,与原变种和其他变种也有所不同,故新拟为异形小蜡Ligustrum sinense Lour. var.dissimile S.J.Hao;var.stauntonii与原变种形态相近,分布区部分重叠,且其性状呈连续性分布,应归入原变种;其余各变种与原变种关系虽远近不一,但作为变种还是合适的。

A TAXONOMIC STUDY OF THE INFRASPECIFIC TAXA OF LIGUSTRUM SINENSE LOUR.

Ligustrum sinense Lour., has a wide distribution in the Yasetze Riverarea and so uthern China. The extensive distribution and diverse environmentalconditions of the species have given rise to many infraspecific taxa. Upon studyingthe morphology and distribution of all its varieties and the evidences of micromor-phological characters of their seed coats and anther walls gained by SEM, this papermade a more objectibe treatment of the varietal categories by means of numerricaltaxonomy. The results of the above analysis have shown that: (1) The specimens collected in Guizhou and Guangxi, which have once beenregarded as var. coryanum and reduced to var. opienense later, are considerablydifferent from the typical var. coryanum in fact. They are somewhat more similarto var. opienense which distribute in the southern part of Sichuan but are not consi-stent with the latter. So, these specimens should be treated as a new variety ofLigustrum sinense Lour. (2) Var. stauntonii are similar to var. sinense in almost a all respects. Theirdistributional areas are in partly overlapping and there are intermediate forms. Itis usually difficult to distinguish them except the extreme forms, According to theresults of numerical analysis and their similarities in morphology and the microm-orphology, var. stauntonii should be reduced to var. sinense. This paper also shows that the evolutionary rates of morphological and micro-morphological characters of the varieties are not identical.