中国南蛇藤属 (卫矛科) 一新记录种及其意义

在开展南蛇藤属分类修订的过程中,于 2011 年在中国云南省西双版纳傣族自治州勐腊县发现南蛇藤属中国分布新记录——拟独子藤 ( Celastrus monospermoides) 。该种形态与独子藤 ( C. monospermus) 较为相似,主要区别为前者叶片窄椭圆形,先端渐尖,果实成熟后不具雌蕊柄,种子长12 mm 以内; 后者叶片椭圆形、阔椭圆形至倒卵椭圆形,果实具有明显的雌蕊柄,种子长15 mm 以上。分子系统学研究表明,拟独子藤与独子藤处于不同分支中,与青江藤 ( C. hindsii) 系统关系最近。由于原记录仅分布于印度尼西亚、马来西亚和菲律宾等热带地区,因此在原产地和我国云南省之间的地区应有更多居群分布,这为探讨南蛇藤属的起源和扩散提供了线索。

A New Record of Celastrus (Celastraceae) in China and Its Implication for the Genus

A new record of Celastrus species in China, C.monospermoides is identified when performing a field investigation in Xishuangbanna, Yunnan Province in 2011 for the taxonomic revision of the genus. Though morphologically similar to C.monospermus, it can be distinguished by narrow elliptic leaves with acuminate apex (vs. elliptic, broadly elliptic or obovate-elliptic leaves), fruits without conspicuous gynophores, and relatively smaller seeds (shorter than 12 mm vs. longer than 15 mm in length). However, it is not clustered in the same clade with C.monospermus, but closely neighbor to C.hindsii in the molecular phylogenetic analysis. For it was recorded endemic to tropical area in Asia such as Indonesia, Malaya, and Philippines, there must be more populations distributed between these area and Yunnan Province in China. This distribute pattern provide new clues in understanding the origin and divergence of the genus Celastrus.