Abstract

The pollen morphology of 89 taxa belonging to the genus Dianthus L. is considered, utilizing light, scanning and transmission electron microscopy, and the taxa are compared based on their pollen characters. Of these, the pollen morphology of 73 taxa is reported for the first time. Pollen grains of Dianthus taxa are spheroidal, polypantoporate and 29.1–53 µm in size, and have 12–24 prominent or sunken apertures uniformly distributed on their surface. Spinules were present on all pollen grains, and puncta were seen in 73 taxa. The exine surface ornamentation can be divided into three types, namely microechinate, microechinate-punctate or microechinate-punctate-foveolate. Cluster analysis and principal component analysis demonstrate that the clustering of Dianthus taxa studied does not correlate well with the sectional classification; rather, the punctum number, the pollen diameter and the spinule number are the most valuable variables for separating the examined taxa.

摘要

对石竹属89个类群的花粉形态进行了考察，利用光学显微镜、扫描电子显微镜和透射电子显微镜，并根据其花粉特征对分类群进行了比较。其中，首次报道了73个类群的花粉形态。石竹类群的花粉粒呈球形、多泛孔状，大小为 29.1-53 µm，表面有 12-24 个均匀分布的突出或凹陷的孔。所有花粉粒上均存在小刺，73 个分类群中可见斑点。外壁表面纹饰可分为微棘突、微棘突-点状或微棘-点-小凹三种类型。聚类分析和主成分分析表明石竹的聚类研究的分类群与断面分类没有很好的相关性；相反，泪点数、花粉直径和小刺数是分离所检查类群的最有价值的变量。