毛榛复合体（桦木科）多变量形态学研究及分类学处理

Corylus mandshurica Maxim. & Rupr. 和 C. sieboldiana Blume 在中国和俄罗斯一直被处理为独立的种。本文对来自不同标本室的这两个种的腊叶标本及野外采集的大量叶片进行了形态学分析，以确定形态分化是否足够成为建立种的依据。对采自中国、韩国和日本覆盖两个种分布区的153份标本的18个形态学性状进行了统计，以构建数据矩阵用于主成分分析。结果表明，包含C. sieboldiana 复合体的数据单位（entities）在所有的形态学性状上均呈现出广泛的重叠区域。叶片和果实性状分析结果表明类群间缺乏分异性。基于形态学性状不足以把 C. mandshurica 从C. sieboldiana 中分离出去，并给予种的等级,也就是说这两个类群在形态上没有完全分化，而且它们的分布区也是相连的。 因此，应该把C. mandshurica作为C. sieboldiana 的种下分类群处理。C. sieboldiana在韩国南部和日本的具短总苞的植物常常被处理为独立的种或变种，但实际上应该作为C. sieboldiana 内的变型处理，因为总苞性状高度变异，即使在同一个体上也是如此。

A multivariate morphometric study on Corylus sieboldiana

Previous taxonomic treatments in Russia and China have considered Corylus mandshurica and C. sieboldiana to be distinct as independent species. A morphometric analysis was conducted to determine if the morphological differentiation from these taxa warrants specific taxonomic recognition with a large sample of field-collected leaves as well as specimens from several herbaria of northeastern Asia. One hundred and fifty two individuals representing Chinese, Korean, and Japanese geographic ranges of the species were scored for 18 morphological characters and the data matrix was used for principal components analysis. The entities that comprise C. sieboldiana complex exhibit widely overlapping ranges in all morphological attributes. The leaf and fruit data may reflect a lack of divergence between taxa. Therefore, we do not regard these to be sufficient for taxonomic splitting of C. mandshurica from C. sieboldiana to warrant the designation of the rank of a species based on morphology. The two taxa were not morphologically well differentiated and their ranges of distribution come together. Therefore, C. mandshurica should be recognized as an infraspecific taxon of C. sieboldiana. C. sieboldiana with short involucres in southern Korea and Japan is often treated as an independent species （C. hallaisanensis） or a variety (C. sieboldiana var. brevirostris), but should be only recognized as a form of C. sieboldiana because this involucral character is highly variable even within the same individual.