小叶椴复合体的叶、花形态连续变异观察

Continuous morphological variations in leaves and flowers of“small-leaved lime complex”

紫椴(Tilia amurensis)和蒙椴(T.mongolica)是分布于北方的主要椴树属植物,形态上有差别但不易区分,二者均可称为小叶椴,本研究将其处理为"小叶椴复合体".利用形态扫描及便携式数码显微镜(Digital Portable Microscope)观察,对小叶椴复合体的叶、花形态指标进行测量,有助于深入了解其形态上的变异规律.研究结果显示,小叶椴复合体的叶、花形态存在连续性,特别是存在着雄蕊退化不完全的现象.

Tilia amurensis and T.mongolicaare two main species of the genus Tiliain northern China.As they are not easy to distinguish taxonomically and are both called small-leaved lime,we considered them＂small-leaved lime complex＂. We used image scanning and portable digital microscopy to measure morphological features of leaves and flowers,which helped to understand morphological variations.It was found that morphological variations of ＂small-leaved lime complex＂were continuous,especially incomplete staminodes were observed.