We used scanning electron microscopy to describe petal epidermal cell patterns and evaluate their systematic implications for 22 representative taxa belonging to all 9 genera of the Rosaceae tribe Spiraeeae, including the monotypic Korean genus Pentactina . Characters of both the adaxial and abaxial surfaces of the petal epidermis, including cell type (papillose conical cells, papillose knobby rugose cells, or tabular rugose cells), anticlinal wall shape (sinuous or curved), and cuticle sculpturing (striate or rugose) were observed. Here, we present the first comprehensive analysis of the tribe based on petal micromorphological data in the context of a molecular phylogeny. We conclude that petal epidermal characters provide strong evidence in support of the independent taxonomic position of the Korean endemic genus Pentactina . Moreover, mapping epidermal characters on the molecular phylogeny indicates that some of the characters are synapomorphies for clades within the tribe. Thus, this study presents new perspectives for future work on the evolution of morphological characters in tribe Spiraeeae.

中文翻译：

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蔷薇科绣线菊花瓣微形态学及其系统意义

我们使用扫描电子显微镜来描述花瓣表皮细胞模式，并评估它们对属于蔷薇科绣线科所有 9 属的 22 个代表性分类群的系统意义，包括单型韩国 Pentactina 属。花瓣表皮的正面和背面的特征，包括细胞类型（乳头状圆锥细胞、乳头状多节皱纹细胞或板状皱纹细胞）、背斜壁形状（蜿蜒或弯曲）和角质层雕刻（条纹或皱纹）。观察到的。在这里，我们在分子系统发育的背景下首次基于花瓣微形态数据对部落进行了综合分析。我们得出结论，花瓣表皮特征为支持韩国特有属 Pentactina 的独立分类地位提供了强有力的证据。而且，在分子系统发育上绘制表皮特征表明，某些特征是部落内进化枝的突触。因此，这项研究为未来关于绣线菊科形态特征进化的工作提供了新的视角。