Abstract

The pollen morphology of 63 species, one subspecies and six varieties of 11 genera in the family Liliaceae was studied in detail using light microscopy (LM) and scanning electron microscopy (SEM). Among them, 22 species and one variety are reported for the first time. Ten pollen characteristics (shape in polar view, ends in polar view, width of colpus, depth of colpus, length of colpus, colpus costa, colpus membranes, type of surface ornamentation, muri, lumina) were selected for cluster analysis of the genera Gagea and Lloydia and for cluster analysis and principal component analysis of the genera Lilium and Nomocharis. The results show that the polar view, colpus morphology and surface ornamentation of pollen grains have important systematic significance. The surface ornamentation of pollen grains in this study can be divided into five types, namely gemmate, reticulate, rugulate, rugulate-perforate and verrucate. In combination with the results of previous research, our results suggest that (i) Clintonia and Streptopus should be included in the family Liliaceae; (ii) Fritillaria and Lilium should be considered independent genera; (iii) Lloydia should belong to Gagea; and (iv) Nomocharis should be merged into Lilium. But our results do not support dividing Lilium into seven sections.

摘要

采用光学显微镜(LM)和扫描电子显微镜(SEM)对百合科11属63种、1个亚种和6个变种的花粉形态进行了详细研究。其中首次报道的有22种1个品种。选择10个花粉特征（极面形状、极面末端、瞳孔宽度、瞳孔深度、瞳孔长度、肋骨、曲轴膜、表面纹饰类型、muri、lumina）对Gagea属进行聚类分析和Lloydia以及用于百合属和Nomocharis属的聚类分析和主成分分析. 结果表明，花粉粒的极视图、花冠形态和表面纹饰具有重要的系统意义。本研究中花粉粒的表面纹饰可分为宝石状、网状、皱纹、皱纹穿孔和疣状五种类型。结合前人的研究结果，我们的结果表明（i）Clintonia和Streptopus应包括在百合科中；(ii)贝母和百合应视为独立属；(iii) Lloydia应属于Gagea；(iv) Nomocharis应并入Lilium. 但是我们的结果不支持将Lilium分成七个部分。