薯蓣科植物地理学的研究

薯蓣科基本上是一个热带科，广布于世界热带地区，共有９属，约６５０种。热带亚洲（尤其云贵高原－横断山一带）很可能是该科的原始分布与分化中心，热带美洲及热带非洲则可能是２次生分布与分化中心。其起源时间可追溯到白垩纪或更早。现代分布格局的形成主要是由于联合古陆的发裂、第四纪冰川的破坏及其自身的一些生物学特性所决定的。

A PHYTOGEGORAPHICAL STUDY ON THE FAMILY DIOSCOREACEAE

The geographical distribution,the center of distribution and differentiation of Dioscore-aceae,and the time of origin are discussed in this paper.Dioscoreaceae is generally a tropicalfamily, containing 9 genera and about 650 species and widely distributed in the tropical re-gions of the world.The primary center of the distribution and differentiation of the family ispossibly tropical Asia(esp.the Yun-Gui plateau and Hengduan Mountain region).Tropi-cal America and tropical Africa may be two secondary centers of distribution and differentia-tion.The time of origin might go back to the Cretaceous period or even before that time.The modern patterns of distribution mainly arise from the separation of the united conti-nents,the destruction by the Quaternary glacier and also some biological characters of thefamily.