巴豆藤(Craspedolobium schochii)分布区的变化及其中国特有属性质的再论证

Distribution Change of Craspedolobium schochii and Unacceptability of Its Endemism to China

特有性是植物区系研究中的重要指标,中国植物区系中的中国特有属对于中国大陆腹地的类群而言是相对稳定的,但对于分布于云南的类群则需要具体分析。巴豆藤(Craspedalobium schochii)分布区发生变化的例子说明对周边国家的植物区系调查仍然不够深入、彻底,在这样的情况下,某些类群的特有概念会有时效的限制,同样,其他一些类似属的分析也支持这样的判断。如何更好地分析此类情况,需要加强同周边国家的科技合作,加大植物区系调查的力度。

Endemism descries species or taxa at higher level that are native to a particular geographical area or continent. It is one of the most important characteristics in a floristic study. The circumscription of plant genera endemic to China from the hinterland of China is rather stable. But as for the taxa distributed in Yunnan, especially those reached the national boundary, their endemism to China is questionable and need to be carefully recognized according to updated distrgoution data. The change of distrgoution for Craspedolobium schochii is a good example. It was recognized as one genus endemic to China previously. However, according to recent investigations, the distribution of this species is extended southwards to the centers of Laos and Thailand. Some genera in such cases were temporarily recognized as endemic to China because of no distribution data available from neighboring countries. The endemism of such Chinese plants is not unchangeable when new distribution data are available. Therefore, it is of great necessity to strengthen the cooperation with the neighboring countries for further investigations on the vegetation and flora in these regions.