中国特有种丁茜形态描述的修订及新分布区的报道

Revised description and new distribution report of Trailliaedoxa gracilis (Rubiaceae)， an endemic species of China

关键词:  丁茜  修订  新分布  中国特有种

Key words:  Trailliaedoxa gracilis  revision  new distribution  China endemic species

摘要:

对中国特有种丁茜进行了形态描述的修订，并报道了其一新分布区。长期以来，丁茜一直被认为仅分布于金沙江流域，但作者们对绿汁江（红河上游元江的一级支流）进行植被考察时发现了其分布，说明丁茜在红河流域亦有分布，从而形成金沙江－红河间断分布的格局。此发现为金沙江从古红河改道的观点提供了新的证据。

Abstract:

This study presents a revised description and new distribution of Trailliaedoxa gracilis，an endemic species of China. T.gracilis has been regarded to be restricted to the Jinsha drainage area in southwestern China，but during the vegetation investigation, we found it in the region along the Lvzhi River(a tributary stream of the Yuanjiang River，the upper part of the Honghe River). Therefore,T.gracilis was proved to exsit in Jinsha drainage areas at the same time，thus there was a disjunctive distribution between Jinsha and Honghe drainage areas. The discovery provided new evidence to the viewpoint that ancient Jinsha River was ever diverted from the ancient Honghe River.