中文摘要：

应用扫描电镜技术对凤仙花属（Impatiens）总状花序组（sect.Racemosae Hook.f.et Thomson）23种植物的种子进行了观察研究。结果表明：总状花序组植物的种子为椭圆体形、倒卵形和狭卵形;长宽比多在1.4~2.3;种皮表面具网状纹饰和指状隆起两种类型,指状隆起又可分为排列疏松和紧密两类。该组的种皮微形态与宏观形态性状相关性较小,但网眼内是否有颗粒物、指状隆起的排列密度、隆起物上是否有颗粒状附属物或凹陷小孔等特征具有种水平上的稳定性和特异性,对该组植物的种间界定具有重要的意义。

英文摘要：

In order to study the seedcoat characters and discuss their taxonomic significance,23 species from sect.Racemosae were sampled and investigated under SEM（Scanning Electron Microscope）in this study.The observation results indicated that the seeds of sect.Racemosae were ellipsoid,obovate,and oblong-ovate.The ratios of length to width are mostly between 1.4- 2.3.Two types of micromorphogical character of seed surface were recognized：reticulate ornamentation and digitiform protrusive,and the later could be loosely or tightly digitiform protrusive.The seedcoat micromorphology characters of sect.Racemosae showed limited of correlation with the gross morphological characters.However,seedcoat micromorphological characters,such as granules present or not in the lumina,granules or pits emerge or not on the protrusive,the density of digitiform protrusive,and so on,are consensus within species and have taxonomical value in circumscription of species within sect.Racemosae.